March 5, 2025

Nutrient samples were collected from six river stations on March 5th. In the five days prior to sampling, there was no precipitation recorded at T.F. Green. 

The highest total nitrogen (TN), total dissolved nitrogen (TDN) and dissolved inorganic nitrogen (DIN) concentrations were observed at Pawtuxet River @ Broad St. (TN = 1,590 ppb, TDN = 1,770 ppb, DIN = 1,533 ppb). The lowest TN, TDN, and DIN concentrations were observed on the Moshassuck River @ Footbridge at Mill St. (TN =558 ppb, TDN = 592 ppb, DIN = 441 ppb).

The next scheduled sampling date is March 19, 2025.

June 25, 2025

Water column profiles were conducted at seven locations in the Providence and Seekonk River estuaries on June 25, 2025 using a Seabird Electronics profiler. In the five days leading up to the survey, 0.01 inches of precipitation were recorded at T.F. Green.  Water column stratification varied between the sites this week from weakly stratified at Pawtuxet Cove to strongly stratified at Conimicut Point, Pomham Rocks, and Phillipsdale Landing.

Dissolved oxygen (DO) conditions were below the hypoxia threshold (2.9 mg/L) in the lower portion of the water column at India Point Park and Phillipsdale Landing. The highest fluorescence readings for the week were measured around 1 meter below the surface at Phillipsdale Landing.

June 25, 2025

Phytoplankton samples were collected on June 25, 2025 at Bullock’s Reach and analyzed in the laboratory shortly after collection.

The water temperature was 24.98 °C, the salinity was 24.10 psu, and the chlorophyll a was 8.14 ug/L.

The qualitative tow net sample had a long filtration time. The filtrate contained jellyfish and had a golden brown coloration.

The analysis of the quantitative whole water sample revealed a total of 1,501,000 cells/L. The microflagellates were found at 330,000 cells/L. The most predominant phytoplankton genera were Cerataulina spp. at 437,000 cells/L, Skeletonema spp. at 287,000 cells/L, and Heterocapsa spp. at 147,000 cells/L.

200x phase contrast micrograph of Akashiwo sanguinea

Akashiwo sanguinea is a planktonic dinoflagellate which lives as a single cell and uses one flagellum for locomotion. These dinoflagellates are mixotrophic, which means they can use different sources for energy and carbon uptake. They are photosynthetic, containing a large number of chloroplasts radiating from the center of the cell, and also prey on various types of smaller organisms.

June 11, 2025

Phytoplankton samples were collected on June 11, 2025 at Bullock’s Reach and analyzed in the laboratory shortly after collection.

The water temperature was 18.0 °C, the salinity was 21.28 psu, and the chlorophyll a was 4.24 ug/L.

The qualitative tow net sample had a moderate filtration time. The filtrate had a medium brown/green coloration.

The analysis of the quantitative whole water sample revealed a total of 5,517,000 cells/L. The microflagellates were found at 112,000 cells/L. The most predominant phytoplankton genera were Guinardia spp. at 1,652,000 cells/L, Chaetoceros spp. at 1,448,000 cells/L, and Leptocylindrus spp. at 1,044,000 cells/L.

200x phase contrast micrograph of phytoplankton

June 25, 2025

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. 

June 11, 2025

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 the Seekonk River and Pawtuxet River, and as fair in all other areas. Overall, chlorophyll ranged from 2.85 µg/L to 28.47 µg/L with an average of 19.66 µg/L. The chlorophyll concentrations from this date are presented in the map below using Inverse Distance Weighting (IDW) interpolation.

June 4, 2025

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 the Seekonk River, and as fair in all other areas. Overall, chlorophyll ranged from 1.10 µg/L to 16.10 µg/L with an average of 7.24 µg/L. The chlorophyll concentrations from this date are presented in the map below using Inverse Distance Weighting (IDW) interpolation. 

May 28, 2025

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 fair in the Southern Providence River, and as good in all other areas. Overall, chlorophyll ranged from 1.35 µg/L to 13.49 µg/L with an average of 5.43 µg/L. The chlorophyll concentrations from this date are presented in the map below using Inverse Distance Weighting (IDW) interpolation. 

June 25, 2025

Water clarity was measured at seven locations in the Providence River and Seekonk River estuaries on June 25, 2025. In the five days prior to the survey, 0.01 inches of precipitation were recorded at TF Green. Secchi depth averaged 2.3 meters. The lowest clarity this week (1.3 meters) was measured at Phillipsdale Landing, while the greatest clarity (2.7 meters) was measured at India Point Park and Pomham Rocks. There was no clear north-to-south gradient in water clarity among the sites this week. Overall, water clarity at most locations remained relatively consistent compared to previous measurements (data collected June 11, 2025).

R.I. Infrastructure Bank Closes On $100 Million In Bond Financing For NBC Phase III CSO Project

PROVIDENCE, R.I. – Rhode Island Infrastructure Bank, the state’s central hub for financing infrastructure improvements for municipalities, businesses, and homeowners, has closed on $100,000,000 in Clean Water State Revolving Fund bond financing, with $7,069,000 in principal forgiveness stemming from the Infrastructure Investment and Jobs Act. Bond proceeds will help finance the ongoing construction of the Narragansett Bay Commission’s Combined Sewer Overflow (CSO) Phase III project and other system infrastructure upgrades.

The $100 million in total financing comes via a Series A $75 million in open market bonds and a Series B $25 million direct loan. The term for both is 30 years at an interest rate of 3.14%. The Series A bonds were rated AAA by S&P and Fitch.

“Rhode Island Infrastructure Bank has been providing low-cost financing for the Narragansett Bay Commission’s CSO project for over two decades, and we’re pleased to continue that partnership with this $100 million bond to support Phase III construction and other system upgrades,” said William Fazioli, Executive Director. “The CSO is among the largest infrastructure projects in Rhode Island’s history and has helped to dramatically improve the health of Narragansett Bay. This is a true demonstration of the importance of investing in infrastructure and utilizing Rhode Island’s Clean Water State Revolving Fund and federal resources from the Infrastructure Investment and Jobs Act.”

“The Rhode Island Infrastructure Bank’s low-cost financing has been crucial for our CSO project,” said Laurie Horridge, Executive Director of the Narragansett Bay Commission. “We are grateful for their decades-long partnership and this latest $100 million Clean Water State Revolving Fund financing, which will support our ongoing CSO Phase III construction and other needed upgrades across our system.”

“Working with my colleagues in the delegation, we were able to deliver historic levels of federal investments for our state’s roads, bridges, and clean water infrastructure through President Biden’s Bipartisan Infrastructure Law.  Thanks to this federal support, Rhode Island is advancing historic projects, like the CSO, to better protect our environment and boost economic development,” said Senator Jack Reed, a member of the Senate Appropriations Committee.  “I was proud to help support phase three of this important project to continue improving the health of Narragansett Bay and significantly enhance stormwater management across the state.”

“The Narragansett Bay Commission’s CSO project is a generational investment in the health of our Bay that is already paying dividends for Rhode Islanders,” said Senator Sheldon Whitehouse.  “As Ranking Member of the Senate Environment and Public Works Committee, I’ll continue fighting to protect the Clean Water State Revolving Fund and other programs that allow the Rhode Island Infrastructure Bank to make these kinds of projects possible.”

This funding will make the Narragansett Bay cleaner and sewer bills more affordable for thousands of Rhode Islanders,” said Representative Seth Magaziner. “I am proud to work with my colleagues in Rhode Island’s Congressional Delegation to deliver funding to support this project so that generations of Rhode Islanders can continue to enjoy a healthier Narragansett Bay.”

“Thanks to the Infrastructure Investment and Jobs Act, we’re protecting Rhode Island’s waterways,” said Representative Gabe Amo. “This federal funding will dramatically improve our environment—preventing sewage from seeping into Narragansett Bay — and ensure the Bay remains clean for commerce and recreation for every Rhode Islander to enjoy.”

“Utilizing the Infrastructure Bank’s capital and below market rate financing on this issue, Narragansett Bay Commission was able to realize significant savings while borrowing at 3.14% interest rate, which is well below traditional financing options,” said Bank Board Chair Vahid Ownjazayeri. “Including this bond, Rhode Island Infrastructure Bank has provided approximately $1 billion in Clean Water State Revolving Fund financing for Narragansett Bay Commission clean water infrastructure investments. This long-term partnership is improving public health and the health of Rhode Island’s environment.”

Since 2003, the Narragansett Bay Commission has used the Bank’s low-cost Clean Water State Revolving Fund program to complete Phase I and Phase II of the CSO project, diverting more than 1 billion gallons of combined water and wastewater that would have otherwise gone straight into Narragansett Bay, and is now treated at their Field’s Point Wastewater Treatment Facility each year. The project has helped to dramatically improve the health of Narragansett Bay.

Phase III of the Combined Sewer Overflow project, currently under construction, is a 2.2-mile long, 30-foot diameter tunnel running underneath Pawtucket and Central Falls that is expected to reduce overflow volumes by 98 percent and treat stormwater before it flows into Narragansett Bay.

The financing team that led this highly successful transaction included RBC Capital Markets as Senior Managing Underwriter, Hilltop Securities as Financial Advisor, and Hinckely Allen as Bond Counsel.

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