Indicators

Nutrients

Total Nitrogen - Discrete

Scatter plot of monthly average total nitrogen over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only nitrogen values obtained from laboratory analyses (triangles) are included in the plot.
Scatter plot of monthly average total nitrogen over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only nitrogen values obtained from laboratory analyses (triangles) are included in the plot.
Seasonal Kendall-Tau Results for - Total Nitrogen
Activity Type Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
Lab No significant trend 5359 35 1989 - 2025 0.3198 0.00256 0.38261 -0.00001 0.9947

Total nitrogen showed no detectable trend between 1989 and 2025.

Map showing location of discrete water quality sampling locations within the boundaries of Rookery Bay National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of discrete water quality sampling locations within the boundaries of Rookery Bay National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.

Total Phosphorus - Discrete

Scatter plot of monthly average total phosphorus over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only phosphorus values obtained from laboratory analyses (triangles) are included in the plot.
Scatter plot of monthly average total phosphorus over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only phosphorus values obtained from laboratory analyses (triangles) are included in the plot.
Seasonal Kendall-Tau Results for - Total Phosphorus
Activity Type Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
Lab No significant trend 5533 32 1994 - 2025 0.04 0.05928 0.04449 0.00013 0.1096

Total phosphorus showed no detectable trend between 1994 and 2025.

Map showing location of discrete water quality sampling locations within the boundaries of Rookery Bay National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of discrete water quality sampling locations within the boundaries of Rookery Bay National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.

Water Quality

Dissolved Oxygen - Discrete

Scatter plot of monthly average dissolved oxygen over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only dissolved oxygen values measured in the field (circles) are included in the plot.
Scatter plot of monthly average dissolved oxygen over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only dissolved oxygen values measured in the field (circles) are included in the plot.
Seasonal Kendall-Tau Results for - Dissolved Oxygen
Activity Type Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
Field Significantly decreasing trend 15320 36 1989 - 2025 5.8 -0.12891 6.16438 -0.01601 5e-04

Monthly average dissolved oxygen decreased by 0.02 mg/L per year.

Map showing location of discrete water quality sampling locations within the boundaries of Rookery Bay National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of discrete water quality sampling locations within the boundaries of Rookery Bay National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.

Dissolved Oxygen - Continuous

Scatter plot of monthly average dissolved oxygen over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Scatter plot of monthly average dissolved oxygen over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Seasonal Kendall-Tau Results - Dissolved Oxygen
Program Location Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
rkbfuwq Significantly decreasing trend 621074 21 2002 - 2025 5.1 -0.31 5.27 -0.03 0
rkbpbwq Significantly decreasing trend 320370 10 2016 - 2025 4.9 -0.17 5.25 -0.02 0.0248
rkbmbwq Significantly decreasing trend 644227 23 2000 - 2025 4.4 -0.26 4.9 -0.02 0
rkbfbwq No significant trend 589693 22 2002 - 2025 5.4 -0.04 5.22 0 0.4095
rkblhwq No significant trend 599204 22 2001 - 2025 5.5 0.02 5.46 0 0.6741
rkbuhwq No significant trend 58164 5 1996 - 2000 3.6 0.01 3.9 -0.02 1
rkbbmwq Insufficient data to calculate trend 10441 2 1997 - 1998 7.2 - - - -

At three program locations, monthly average dissolved oxygen decreased between 0.02 and 0.03 mg/L per year. No detectable change in monthly average dissolved oxygen was observed at three locations. There was insufficient data to fit a model for one location.

Map showing location of dissolved oxygen continuous water quality sampling locations within the boundaries of Rookery Bay National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of dissolved oxygen continuous water quality sampling locations within the boundaries of Rookery Bay National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.

Dissolved Oxygen Saturation - Discrete

Scatter plot of monthly average dissolved oxygen saturation over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only dissolved oxygen saturation values measured in the field (circles) are included in the plot.
Scatter plot of monthly average dissolved oxygen saturation over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only dissolved oxygen saturation values measured in the field (circles) are included in the plot.
Seasonal Kendall-Tau Results for - Dissolved Oxygen Saturation
Activity Type Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
Field No significant trend 1410 26 1998 - 2025 78.1 -0.05863 78.95521 -0.16417 0.2965

Dissolved oxygen saturation showed no detectable trend between 1998 and 2025.

Map showing location of discrete water quality sampling locations within the boundaries of Rookery Bay National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of discrete water quality sampling locations within the boundaries of Rookery Bay National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.

Dissolved Oxygen Saturation - Continuous

Scatter plot of monthly average dissolved oxygen saturation over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Scatter plot of monthly average dissolved oxygen saturation over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Seasonal Kendall-Tau Results - Dissolved Oxygen Saturation
Program Location Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
rkblhwq No significant trend 611522 22 2001 - 2025 82.0 0.05 81.16 0.06 0.2259
rkbfbwq No significant trend 593999 22 2002 - 2025 78.8 0.02 79.35 0.02 0.7199
rkbpbwq Significantly decreasing trend 322002 10 2016 - 2025 72.7 -0.18 77.95 -0.33 0.0186
rkbmbwq Significantly decreasing trend 650551 23 2000 - 2025 65.2 -0.23 73.13 -0.28 0
rkbfuwq Significantly decreasing trend 621333 21 2002 - 2025 72.5 -0.23 77.51 -0.21 0
rkbuhwq No significant trend 58164 5 1996 - 2000 49.7 0 50.53 -0.02 1
rkbbmwq Insufficient data to calculate trend 10441 2 1997 - 1998 102.4 - - - -

At three program locations, monthly average dissolved oxygen saturation decreased between 0.21 and 0.33% per year. No detectable change in monthly average dissolved oxygen saturation was observed at three locations. There was insufficient data to fit a model for one location.

Map showing location of dissolved oxygen saturation continuous water quality sampling locations within the boundaries of Rookery Bay National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of dissolved oxygen saturation continuous water quality sampling locations within the boundaries of Rookery Bay National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.

Salinity - Discrete

Scatter plot of monthly average salinity over time. If the time series included ten or more years of discrete observations, significant (blue) or non-significant (magenta) trend lines are also shown. Discrete salinity values derived from grab samples analyzed in the field (circles) or the laboratory (triangles) are both included in the plot.
Scatter plot of monthly average salinity over time. If the time series included ten or more years of discrete observations, significant (blue) or non-significant (magenta) trend lines are also shown. Discrete salinity values derived from grab samples analyzed in the field (circles) or the laboratory (triangles) are both included in the plot.
Seasonal Kendall-Tau Results for - Salinity
Activity Type Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
All Significantly decreasing trend 16854 54 1954 - 2025 32.7 -0.1531 34.23547 -0.04388 0

Monthly average salinity decreased by 0.04 ppt per year.

Map showing location of discrete water quality sampling locations within the boundaries of Rookery Bay National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of discrete water quality sampling locations within the boundaries of Rookery Bay National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.

Salinity - Continuous

National Water Information System - 7

Scatter plot of monthly average salinity over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Scatter plot of monthly average salinity over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Seasonal Kendall-Tau Results for All Stations - Salinity
Program Location Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
255534081324000 No significant trend 5981 18 2007 - 2025 32 -0.08 34.53 -0.1 0.1072
255432081303900 Significantly decreasing trend 6288 19 2006 - 2025 22 -0.14 27.42 -0.18 0.0072
255123081321300 Significantly decreasing trend 1809 8 2007 - 2017 32 -0.23 35.11 -0.44 0.0182
255654081350200 No significant trend 6002 18 2007 - 2025 32 -0.07 33.68 -0.07 0.1714
255138081321701 No significant trend 2809 9 2017 - 2025 32 0.09 29.34 0.16 0.3216
255732081363700 No significant trend 1434 5 2011 - 2015 34 0.25 32.15 0.52 0.0955
255532081314300 Insufficient data to calculate trend 902 3 2009 - 2011 31 - - - -
255443081314700 Insufficient data to calculate trend 1465 4 2007 - 2011 32 - - - -
02291330 Insufficient data to calculate trend 1697 4 2011 - 2014 35 - - - -

At one program location, monthly average salinity increased by 2.06 ppt per year. At four program locations, monthly average salinity decreased between 0.07 and 0.44 ppt per year. No detectable change in monthly average salinity was observed at seven locations. There was insufficient data to fit a model for four locations.

Map showing location of salinity continuous water quality sampling locations within the boundaries of Rookery Bay National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of salinity continuous water quality sampling locations within the boundaries of Rookery Bay National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.

Rookery Bay National Estuarine Research Reserve System-Wide Monitoring Program - 354

Scatter plot of monthly average salinity over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Scatter plot of monthly average salinity over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Seasonal Kendall-Tau Results for All Stations - Salinity
Program Location Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
rkbmbwq Significantly decreasing trend 725814 26 2000 - 2025 33.3 -0.11 34.95 -0.07 0.0073
rkbfbwq No significant trend 688966 24 2002 - 2025 29.8 0.01 31.48 0.01 0.8256
rkbfuwq No significant trend 701628 24 2002 - 2025 26.2 -0.02 28.81 -0.03 0.6384
rkbpbwq No significant trend 320685 10 2016 - 2025 30.5 0.06 30.56 0.11 0.4435
rkbbmwq Insufficient data to calculate trend 12256 2 1997 - 1998 34.5 - - - -
rkblhwq Significantly decreasing trend 686355 25 2001 - 2025 33.1 -0.14 34.62 -0.09 8e-04
rkbuhwq Significantly increasing trend 68446 5 1996 - 2000 21.1 0.31 16.74 2.06 0.0358

At one program location, monthly average salinity increased by 2.06 ppt per year. At four program locations, monthly average salinity decreased between 0.07 and 0.44 ppt per year. No detectable change in monthly average salinity was observed at seven locations. There was insufficient data to fit a model for four locations.

Map showing location of salinity continuous water quality sampling locations within the boundaries of Rookery Bay National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of salinity continuous water quality sampling locations within the boundaries of Rookery Bay National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.

Water Temperature - Discrete

Scatter plot of monthly average water temperature over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only water temperature measurements taken in the field (circles) are included in the plot.
Scatter plot of monthly average water temperature over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only water temperature measurements taken in the field (circles) are included in the plot.
Seasonal Kendall-Tau Results for - Water Temperature
Activity Type Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
Field Significantly increasing trend 16791 51 1954 - 2025 26.65 0.1049 25.46291 0.01251 0.0015

Monthly average water temperature increased by 0.01°C per year.

Map showing location of discrete water quality sampling locations within the boundaries of Rookery Bay National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of discrete water quality sampling locations within the boundaries of Rookery Bay National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.

Water Temperature - Continuous

National Water Information System - 7

Scatter plot of monthly average water temperature over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Scatter plot of monthly average water temperature over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Seasonal Kendall-Tau Results for All Stations - Water Temperature
Program Location Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
255534081324000 Significantly increasing trend 6044 18 2007 - 2025 26.7 0.14 25.55 0.03 0.0051
255654081350200 Significantly increasing trend 6041 18 2007 - 2025 26.8 0.13 26.27 0.04 0.0123
255138081321701 No significant trend 2827 9 2017 - 2025 27.2 0.06 26.85 0.03 0.4855
255432081303900 Significantly increasing trend 6347 19 2006 - 2025 27.0 0.17 26.26 0.05 5e-04
255123081321300 No significant trend 1818 8 2007 - 2017 27.3 0.1 26.46 0.03 0.3843
255732081363700 No significant trend 1435 5 2011 - 2015 28.4 0.24 27.3 0.23 0.1149
255443081314700 Insufficient data to calculate trend 2011 4 2007 - 2011 29.3 - - - -
255532081314300 Insufficient data to calculate trend 906 3 2009 - 2011 29.3 - - - -
02291330 Insufficient data to calculate trend 1901 4 2011 - 2014 28.3 - - - -

At seven program locations, monthly average water temperature increased between 0.03 and 0.07°C per year. No detectable change in monthly average water temperature was observed at five locations. There was insufficient data to fit a model for four locations.

Map showing location of water temperature continuous water quality sampling locations within the boundaries of Rookery Bay National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of water temperature continuous water quality sampling locations within the boundaries of Rookery Bay National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.

Rookery Bay National Estuarine Research Reserve System-Wide Monitoring Program - 354

Scatter plot of monthly average water temperature over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Scatter plot of monthly average water temperature over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Seasonal Kendall-Tau Results for All Stations - Water Temperature
Program Location Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
rkbfbwq Significantly increasing trend 704805 24 2002 - 2025 27.0 0.24 26.16 0.04 0
rkbmbwq Significantly increasing trend 749141 26 2000 - 2025 26.9 0.26 26.05 0.05 0
rkbfuwq Significantly increasing trend 712059 24 2002 - 2025 27.0 0.27 26.05 0.07 0
rkbuhwq No significant trend 68971 5 1996 - 2000 26.8 -0.01 26.3 -0.01 1
rkblhwq Significantly increasing trend 717507 25 2001 - 2025 26.9 0.24 26.19 0.05 0
rkbpbwq No significant trend 323585 10 2016 - 2025 27.5 0.08 26.96 0.04 0.2983
rkbbmwq Insufficient data to calculate trend 12610 2 1997 - 1998 23.8 - - - -

At seven program locations, monthly average water temperature increased between 0.03 and 0.07°C per year. No detectable change in monthly average water temperature was observed at five locations. There was insufficient data to fit a model for four locations.

Map showing location of water temperature continuous water quality sampling locations within the boundaries of Rookery Bay National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of water temperature continuous water quality sampling locations within the boundaries of Rookery Bay National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.

pH - Discrete

Scatter plot of monthly average pH over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only pH values measured in the field (circles) are included in the plot.
Scatter plot of monthly average pH over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only pH values measured in the field (circles) are included in the plot.
Seasonal Kendall-Tau Results for - pH
Activity Type Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
Field Significantly decreasing trend 7305 39 1955 - 2025 7.86 -0.21082 8.10144 -0.00553 0

Monthly average pH decreased by 0.01 pH units per year.

Map showing location of discrete water quality sampling locations within the boundaries of Rookery Bay National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of discrete water quality sampling locations within the boundaries of Rookery Bay National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.

pH - Continuous

Scatter plot of monthly average pH over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Scatter plot of monthly average pH over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Seasonal Kendall-Tau Results - pH
Program Location Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
rkblhwq Significantly increasing trend 658342 25 2001 - 2025 7.9 0.17 7.83 0 1e-04
rkbmbwq Significantly decreasing trend 714491 26 2000 - 2025 7.7 -0.09 7.7 0 0.0236
rkbfuwq No significant trend 673674 24 2002 - 2025 7.7 0 7.72 0 0.9823
rkbfbwq No significant trend 656468 24 2002 - 2025 7.8 0.06 7.83 0 0.1501
rkbuhwq Significantly increasing trend 65814 5 1996 - 2000 7.2 0.37 7.05 0.07 0.0081
rkbpbwq No significant trend 313866 10 2016 - 2025 7.8 0.11 7.8 0 0.1547
rkbbmwq Insufficient data to calculate trend 12610 2 1997 - 1998 8.0 - - - -

At two program locations, monthly average pH increased by less than 0.01 pH units per year at one site and by 0.07 pH units per year at the other. At one program location, monthly average pH decreased by less than 0.01 pH units per year. No detectable change in monthly average pH was observed at three locations. There was insufficient data to fit a model for one location.

Map showing location of ph continuous water quality sampling locations within the boundaries of Rookery Bay National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of ph continuous water quality sampling locations within the boundaries of Rookery Bay National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.

Water Clarity

Turbidity - Discrete

Scatter plot of monthly average turbidity over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only turbidity values measured in the laboratory (triangles) are included in the plot.
Scatter plot of monthly average turbidity over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only turbidity values measured in the laboratory (triangles) are included in the plot.
Seasonal Kendall-Tau Results for - Turbidity
Activity Type Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
Lab Significantly increasing trend 6421 33 1989 - 2025 4.38 0.19772 4.35865 0.08394 0

Monthly average turbidity increased by 0.08 NTU per year, indicating a decrease in water clarity.

Map showing location of discrete water quality sampling locations within the boundaries of Rookery Bay National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of discrete water quality sampling locations within the boundaries of Rookery Bay National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.

Turbidity - Continuous

Scatter plot of monthly average turbidity over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Scatter plot of monthly average turbidity over time at continuously monitored program locations. Each location is analyzed separately, with significant (blue) or non-significant (magenta) trend lines shown for time series that included five or more years of observations.
Seasonal Kendall-Tau Results - Turbidity
Program Location Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
rkbmbwq Significantly decreasing trend 701426 26 2000 - 2025 9 -0.24 12.78 -0.14 0
rkbfbwq Significantly decreasing trend 668705 24 2002 - 2025 7 -0.4 11.4 -0.24 0
rkbfuwq Significantly decreasing trend 642336 24 2002 - 2025 6 -0.21 8.6 -0.08 0
rkbpbwq Significantly decreasing trend 317056 10 2016 - 2025 9 -0.34 13.68 -0.43 0
rkbuhwq No significant trend 61608 5 1996 - 2000 5 -0.11 8.57 -0.7 0.5228
rkblhwq Significantly decreasing trend 633518 25 2001 - 2025 8 -0.29 12.25 -0.2 0
rkbbmwq Insufficient data to calculate trend 10654 2 1997 - 1998 11 - - - -

At five program locations, monthly average turbidity decreased between 0.08 and 0.43 NTU per year. No detectable change in monthly average turbidity was observed at one location. There was insufficient data to fit a model for one location.

Map showing location of turbidity continuous water quality sampling locations within the boundaries of Rookery Bay National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of turbidity continuous water quality sampling locations within the boundaries of Rookery Bay National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.

Total Suspended Solids - Discrete

Scatter plot of monthly average total suspended solids (TSS) over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only TSS values obtained from laboratory analyses (triangles) are included in the plot.
Scatter plot of monthly average total suspended solids (TSS) over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only TSS values obtained from laboratory analyses (triangles) are included in the plot.
Seasonal Kendall-Tau Results for - Total Suspended Solids
Activity Type Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
Lab Significantly increasing trend 881 31 1989 - 2024 7.2 0.37975 -1.36915 0.27778 0

Monthly average total suspended solids increased by 0.28 mg/L per year, indicating a decrease in water clarity.

Map showing location of discrete water quality sampling locations within the boundaries of Rookery Bay National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of discrete water quality sampling locations within the boundaries of Rookery Bay National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.

Chlorophyll a, Uncorrected for Pheophytin - Discrete

Scatter plot of monthly average levels of chlorophyll a, uncorrected for pheophytin, over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only laboratory-analyzed chlorophyll a (triangles) is included in the plot.
Scatter plot of monthly average levels of chlorophyll a, uncorrected for pheophytin, over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only laboratory-analyzed chlorophyll a (triangles) is included in the plot.
Seasonal Kendall-Tau Results for - Chlorophyll a, Uncorrected for Pheophytin
Activity Type Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
Lab Significantly increasing trend 5411 32 1994 - 2025 4.4765 0.33505 3.63887 0.10037 0

Monthly average chlorophyll a, uncorrected for pheophytin, increased by 0.1 µg/L per year, indicating a decrease in water clarity.

Map showing location of discrete water quality sampling locations within the boundaries of Rookery Bay National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of discrete water quality sampling locations within the boundaries of Rookery Bay National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.

Chlorophyll a, Corrected for Pheophytin - Discrete

Scatter plot of monthly average levels of chlorophyll a, corrected for pheophytin, over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only laboratory-analyzed chlorophyll a (triangles) is included in the plot.
Scatter plot of monthly average levels of chlorophyll a, corrected for pheophytin, over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only laboratory-analyzed chlorophyll a (triangles) is included in the plot.
Seasonal Kendall-Tau Results for - Chlorophyll a, Corrected for Pheophytin
Activity Type Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
Lab No significant trend 2315 16 2002 - 2025 4.2 0.07689 3.27544 0.03625 0.2102

Chlorophyll a, corrected for pheophytin, showed no detectable trend between 2002 and 2025.

Map showing location of discrete water quality sampling locations within the boundaries of Rookery Bay National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of discrete water quality sampling locations within the boundaries of Rookery Bay National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.

Secchi Depth - Discrete

Scatter plot of monthly average Secchi depth over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Secchi depth is only measured in the field (circles).
Scatter plot of monthly average Secchi depth over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Secchi depth is only measured in the field (circles).
Seasonal Kendall-Tau Results for - Secchi Depth
Activity Type Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
Field Significantly increasing trend 725 22 1998 - 2025 -1.06681 0.25018 -1.22762 0.01657 2e-04

Monthly average Secchi depth became shallower by 0.02 m per year, indicating a decrease in water clarity.

Map showing location of discrete water quality sampling locations within the boundaries of Rookery Bay National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of discrete water quality sampling locations within the boundaries of Rookery Bay National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.

Colored Dissolved Organic Matter - Discrete

Scatter plot of monthly average colored dissolved organic matter (CDOM) over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only laboratory-analyzed CDOM (triangles) is included in the plot.
Scatter plot of monthly average colored dissolved organic matter (CDOM) over time. If the time series included ten or more years of discrete observations, a significant (blue) or non-significant (magenta) trend line is also shown. Only laboratory-analyzed CDOM (triangles) is included in the plot.
Seasonal Kendall-Tau Results for - Colored Dissolved Organic Matter
Activity Type Statistical Trend Sample Count Years with Data Period of Record Median Result Value Tau Sen Intercept Sen Slope P
Lab No significant trend 193 12 2001 - 2017 8 0.3619 5.61538 0.27778 0.1533

Colored dissolved organic matter showed no detectable trend between 2001 and 2017.

Map showing location of discrete water quality sampling locations within the boundaries of Rookery Bay National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.
Map showing location of discrete water quality sampling locations within the boundaries of Rookery Bay National Estuarine Research Reserve. The bubble size on the maps above reflect the amount of data available at each sampling site.