Surface Mapping

Surface chlorophyll data were collected on June 25, 2025, while the R/V Monitor was underway collecting nutrient samples in the Providence and Seekonk River estuary. The average chlorophyll concentrations were categorized as fair in the Seekonk River, and as good in all other areas. The average chlorophyll concentrations were categorized as good in all areas surveyed. Overall, chlorophyll ranged from 0.39 µg/L to 17.96 µg/L with an average of 2.01 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 June 11, 2025, while the R/V Monitor was underway collecting nutrient samples in the Providence and Seekonk River estuary. The average chlorophyll concentrations were categorized as good in all areas surveyed. Overall, chlorophyll ranged from 0.54 µg/L to 4.52 µg/L with an average of 1.72 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 June 4, 2025, while the R/V Monitor was underway collecting nutrient samples in the Providence and Seekonk River estuary. The average chlorophyll concentrations were categorized as good in all areas surveyed. Overall, chlorophyll ranged from 0.26 µg/L to 3.70 µg/L with an average of 1.67 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 May 28, 2025, while the R/V Monitor was underway collecting nutrient samples in the Providence and Seekonk River estuary. The average chlorophyll concentrations were categorized as good in all areas surveyed. Overall, chlorophyll ranged from 0.32 µg/L to 3.10 µg/L with an average of 1.25 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 May 21, 2025, while the R/V Monitor was underway collecting nutrient samples in the Providence and Seekonk River estuary. The average chlorophyll concentrations were categorized as good in all areas surveyed. Overall, chlorophyll ranged from 0.33 µg/L to 3.10 µg/L with an average of 0.68 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 May 7, 2025, while the R/V Monitor was underway collecting nutrient samples in the Providence and Seekonk River estuary. The average chlorophyll concentrations were categorized as good in all areas surveyed. Overall, chlorophyll ranged from 0.46 µg/L to 2.09 µg/L with an average of 0.88 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 November 7, 2024, while the R/V Monitor was underway collecting nutrient samples in the Providence and Seekonk River estuary. The average chlorophyll concentrations were categorized as good in all areas surveyed. Overall, chlorophyll ranged from 0.53 µg/L to 17.57 µg/L with an average of 2.89 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 June 12, 2024 while the R/V Monitor was underway collecting nutrient samples in the Providence and Seekonk River estuaries. The average chlorophyll concentrations were categorized as good in the Pawtuxet River, poor in the Northern Providence River Channel, and as fair in all other areas. Overall, chlorophyll ranged from 1.48 to 44.81 µg/L with an average of 14.44 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 25, 2023 while the R/V Monitor was underway collecting nutrient samples in the Providence and Seekonk River estuaries.  The average chlorophyll concentrations were categorized Good in the areas surveyed. Overall, chlorophyll ranged from 0.91 µg/L to 4.06 µg/L with an average of 1.73 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 18, 2023 while the R/V Monitor was underway collecting nutrient samples in the Providence and Seekonk River estuaries.  The average chlorophyll concentrations were categorized Good in the areas surveyed. Overall, chlorophyll ranged from 0.99 µg/L to 34.57 µg/L with an average of 5.52µg/L. The chlorophyll concentrations from this date are presented in the map below using Inverse Distance Weighting (IDW) interpolation.