DirtyWaterWatch

Rhode Island / Waters /

Flat River Reservoir

Reservoir in Rhode Island · near West Greenwich

Status now

No current report

At least one source we follow covers this water, and nothing it reports applies right now.

Why this colour: No current report: nothing a covering source reports colours this water now. How long a water stays coloured, and why

Source: ri-dem-cyano, last answered 2026-11-02 11:55 UTC; ri-ridoh-beaches, last answered 2026-11-02 11:55 UTC. Status computed by DirtyWaterWatch as of 2026-11-02 11:56 UTC.

It is not a finding about the water. Discharges go unreported, reports arrive late, and storm runoff carries bacteria too. Follow posted signs and local health advice.

As of Nov 2, 2026, 6:56 AM EST.

Map

Source: water outlines from OpenBoatLaunch and OpenStreetMap contributors (ODbL); outfalls from EPA ECHO and the state outfall layers; modeled reaches computed by DirtyWaterWatch from USGS NLDI, NHDPlus and the nearest USGS gauge (Jobson 1996); basemap OpenFreeMap and OpenMapTiles.

Outfalls are small brown dots.

The last 90 days

Last 90 days, hour by hour. Red: advisory in effect; yellow: caution; hatched yellow: unresolved, no end reported; grey: no current report; hatched purple: a source was not updating.

Source: hourly statuses computed by DirtyWaterWatch (pipeline build/status.py) from the events linked above and the rules on the methods page; history as of 2026-11-02 11:56 UTC.

Discharges over the years

  • Hours under advisory, last 12 months385Dec 2025 to Nov 2026
  • 2026 season under advisory8.7%May to October; 385 h

Hours under advisory per month

Hours this water was under an advisory, by the map's red rules.

  • Advisory in effect

Sources: RI DEM cyanobacteria advisories; RIDOH beach closures. Covered 2000-06-12 to 2026-11-02.

Show table
Hours under advisory per month
MonthHours under advisoryFrom discharge windowsOfficial advisory onlyHours in monthCoverage
Jan 2022000744
Feb 2022000672
Mar 2022000744
Apr 2022000720
May 2022000744
Jun 2022000720
Jul 2022000744
Aug 2022000744
Sep 2022000720
Oct 2022000744
Nov 2022000720
Dec 2022000744
Jan 2023000744
Feb 2023000672
Mar 2023000744
Apr 2023000720
May 2023000744
Jun 2023000720
Jul 2023000744
Aug 2023000744
Sep 2023000720
Oct 2023000744
Nov 2023000720
Dec 2023000744
Jan 2024000744
Feb 2024000696
Mar 2024000744
Apr 2024000720
May 2024000744
Jun 2024000720
Jul 2024000744
Aug 2024000744
Sep 2024000720
Oct 2024000744
Nov 2024000720
Dec 2024000744
Jan 2025000744
Feb 2025000672
Mar 2025000744
Apr 2025000720
May 2025000744
Jun 2025000720
Jul 2025000744
Aug 2025000744
Sep 2025000720
Oct 2025000744
Nov 2025000720
Dec 2025000744
Jan 2026000744
Feb 2026000672
Mar 2026000744
Apr 2026000720
May 2026000744
Jun 2026000720
Jul 2026000744
Aug 2026000744
Sep 2026000720
Oct 20263850385744
Nov 202600032

Hours under advisory per year

Hours under advisory each year; 2026 to date.

  • Advisory in effect
  • Partly covered or sparse source

Sources: RI DEM cyanobacteria advisories; RIDOH beach closures. Covered 2000-06-12 to 2026-11-02.

Show table
Hours under advisory per year
YearHours under advisoryShare of the yearCoverage
200000.0%Partly covered or sparse source
200100.0%
200200.0%
200300.0%
2004961.1%
200500.0%
200600.0%
200700.0%
200800.0%
200900.0%
201000.0%
201100.0%
201200.0%
201300.0%
201400.0%
201500.0%
201600.0%
201700.0%
201800.0%
201900.0%
202000.0%
202100.0%
202200.0%
202300.0%
202400.0%
202500.0%
20263855.2%

Share of the May to October season under advisory

Share of the hours from May 1 to October 31 with an advisory in effect.

  • Advisory in effect
  • Season partly covered

Seasons only partly covered by a source: 2000 (share is of the covered hours).

Sources: RI DEM cyanobacteria advisories; RIDOH beach closures. Covered 2000-06-12 to 2026-11-02.

Show table
Share of the May to October season under advisory
SeasonShare under advisoryHours under advisoryHours coveredSeason hoursPartly covered
20000.0%03,4094,416yes
20010.0%04,4164,416
20020.0%04,4164,416
20030.0%04,4164,416
20042.2%964,4164,416
20050.0%04,4164,416
20060.0%04,4164,416
20070.0%04,4164,416
20080.0%04,4164,416
20090.0%04,4164,416
20100.0%04,4164,416
20110.0%04,4164,416
20120.0%04,4164,416
20130.0%04,4164,416
20140.0%04,4164,416
20150.0%04,4164,416
20160.0%04,4164,416
20170.0%04,4164,416
20180.0%04,4164,416
20190.0%04,4164,416
20200.0%04,4164,416
20210.0%04,4164,416
20220.0%04,4164,416
20230.0%04,4164,416
20240.0%04,4164,416
20250.0%04,4164,416
20268.7%3854,4164,416
How these charts are counted

Discharge events are counted once: where a source publishes both public notices and verified reports (MassDEP, Vermont DEC), a discharger's month with any verified report counts its verified reports only, and other months count notices. Revisions are folded into the record they revise, and EPA copies of a state report are not counted twice. Monthly and yearly totals (Maine DEP, EPA discharge monitoring reports, Portsmouth) are shown on their own and never added to the event counts. Hours under advisory follow the map's red rules. A muted band marks periods no source covers: a gap there is missing data, not a quiet month.

  • RI DEM cyanobacteria advisories: 2026-05-21 to now
  • RIDOH beach closures: 2000-06-12 to now

Every event on Flat River Reservoir

Events placed on Flat River Reservoir, newest first
StartEnd Discharger OutfallTypeVolumeSourceLinks
Oct 5, 2026, 3:00 PM EDT Oct 21, 2026, 3:36 PM EDT not stated not stated Cyanobacteria advisory not reported RIDEM and RIDOH cyanobacteria advisories (RIDEM advisories layer) via ri-dem-cyano, record 5, updated by the source Oct 29, 2026, 3:49 PM EDT, retrieved 2026-11-02 11:55 UTC · notice Event: Cyanobacteria advisory, , Oct 5, 2026, 3:00 PM EDT · Map
Jun 30, 2004 Jul 3, 2004 not stated not stated Beach closure not reported Rhode Island Department of Health (RIDOH) Beach Monitoring Program via ri-ridoh-beaches, record colwells-campground:coventry:2004-06-30, the source gives no report time, retrieved 2026-11-02 10:57 UTC · notice record below · Map
Full record (older than 180 days, so no page of its own)

This record in the archive list

Outfalls on this water

No outfall in the registry is matched to this water.

Launches

Source: OpenBoatLaunch launch records (public agency data and OpenStreetMap, ODbL). · Flat River Reservoir on OpenBoatLaunch

Sources covering this water

2 events placed on this water in this build.