Surface Mapping

Surface chlorophyll data were collected on October 14, 2026, while the R/V Data Stream was underway collecting nutrients samples in the Providence and Seekonk River Estuaries. The average chlorophyll concentrations were categorized as good overall with all areas sampled having average chlorophyll concentrations <5 µg/L. Overall, chlorophyll ranged from 1.00 µg/L to 5.09 µg/L with an average of 1.85 µg/L. The chlorophyll concentrations from this date are presented in the map below using Inverse Distance Weighting (IDW) interpolation.

Surface chlorophyll data were collected on October 7, 2026, while the R/V Data Stream was underway collecting nutrients samples in the Providence and Seekonk River Estuaries. The average chlorophyll concentrations were categorized as good overall with all areas sampled having average chlorophyll concentrations <5 µg/L. Overall, chlorophyll ranged from 0.69 µg/L to 7.45 µg/L with an average of 2.62 µg/L. The chlorophyll concentrations from this date are presented in the map below using Inverse Distance Weighting (IDW) interpolation.

Surface chlorophyll data were collected on September 30, 2026, while the R/V Data Stream was underway collecting nutrients samples in the Providence and Seekonk River Estuaries. The average chlorophyll concentrations were categorized as good overall with all areas sampled having average chlorophyll concentrations <5 µg/L. Overall, chlorophyll ranged from 1.23 µg/L to 12.56 µg/L with an average of 2.58 µg/L. The chlorophyll concentrations from this date are presented in the map below using Inverse Distance Weighting (IDW) interpolation.

Surface chlorophyll data were collected on September 22, 2026, while the R/V Data Stream was underway collecting bacteria samples in the Providence and Seekonk River Estuaries. The average chlorophyll concentrations were categorized as good in the Northern Providence River Channel and the Pawtuxet River Area, and as fair in all other areas. The average chlorophyll concentrations were categorized as fair over all areas surveyed. Overall, chlorophyll ranged from 2.10 µg/L to 15.02 µg/L with an average of 6.57 µg/L. The chlorophyll concentrations from this date are presented in the map below using Inverse Distance Weighting (IDW) interpolation.

Surface chlorophyll data were collected on September 16, 2026, while the R/V Data Stream was underway collecting nutrients samples in the Providence and Seekonk River Estuaries. The average chlorophyll concentrations were categorized as fair overall with all areas sampled having average chlorophyll concentrations between 5 µg/L and 20 µg/L. Overall, chlorophyll ranged from 3.77 µg/L to 20.37 µg/L with an average of 8.27 µg/L. The chlorophyll concentrations from this date are presented in the map below using Inverse Distance Weighting (IDW) interpolation.

Surface chlorophyll data were collected on September 9, 2026, while the R/V Data Stream was underway collecting bacteria samples in the Providence and Seekonk River Estuaries. The average chlorophyll concentrations were categorized as fair overall with all areas sampled having average chlorophyll concentrations between 5 µg/L and 20 µg/L. Overall, chlorophyll ranged from 2.56 µg/L to 21.64 µg/L with an average of 6.88 µg/L. The chlorophyll concentrations from this date are presented in the map below using Inverse Distance Weighting (IDW) interpolation.

Surface chlorophyll data were collected on August 26, 2026, while the R/V Data Stream was underway collecting bacteria samples in the Providence and Seekonk River Estuaries. The average chlorophyll concentrations were categorized as fair overall with all areas sampled having average chlorophyll concentrations between 5 µg/L and 20 µg/L. Overall, chlorophyll ranged from 2.23 µg/L to 172.72 µg/L with an average of 11.20 µg/L. The chlorophyll concentrations from this date are presented in the map below using Inverse Distance Weighting (IDW) interpolation.

Surface chlorophyll data were collected on August 19, 2026, while the R/V Data Stream was underway collecting nutrients samples in the Providence and Seekonk River Estuaries. The chlorophyll concentrations were categorized as fair overall with most areas sampled having average chlorophyll concentrations between 5 µg/L and 20 µg/L, with the exception of the Seekonk River, which had average chlorophyll concentrations above 20 µg/L (categorized as poor), and the Northern Providence River Channel, which had average chlorophyll concentrations below 5 µg/L (categorized as good). Overall, chlorophyll ranged from 1.93 µg/L to 557.34 µg/L with an average of 17.05 µg/L. The chlorophyll concentrations from this date are presented in the map below using Inverse Distance Weighting (IDW) interpolation.

Surface chlorophyll data were collected on July 30, 2026, while the R/V Data Stream was underway collecting bacteria samples in the Providence and Seekonk River Estuaries. The chlorophyll concentrations were categorized as fair overall with most areas sampled having average chlorophyll concentrations between 5 µg/L and 20 µg/L, with the exception of the Seekonk River, which had average chlorophyll concentrations above 20 µg/L (categorized as poor). Overall, chlorophyll ranged from 3.63 µg/L to 128.48 µg/L with an average of 15.46 µg/L. The chlorophyll concentrations from this date are presented in the map below using Inverse Distance Weighting (IDW) interpolation.

Surface chlorophyll data were collected on July 23, 2026, while the R/V Data Stream was underway collecting bacteria samples in the Providence and Seekonk River Estuaries. The chlorophyll concentrations were categorized as fair overall with most areas sampled having average chlorophyll concentrations between 5 µg/L and 20 µg/L, with the exception of the Seekonk River, which had average chlorophyll concentrations above 20 µg/L (categorized as poor). Overall, chlorophyll ranged from 4.51 µg/L to 77.03 µg/L with an average of 15.49 µg/L. The chlorophyll concentrations from this date are presented in the map below using Inverse Distance Weighting (IDW) interpolation.