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Massachusetts / Waters /

Green RIver

River in Massachusetts, past Colrain, Greenfield and Leyden

Current status

No current status shown

No current status is assigned to this water outline. Check the water page for reports and any estimated downstream stretches. Why this status, and its source

This badge describes the water outline. Check the downstream stretches on the map and below for discharge statuses.

Map sources: water outlines and launches from OpenBoatLaunch and OpenStreetMap contributors (Open Database License); wastewater outlets from EPA and state records; downstream estimates by DirtyWaterWatch using U.S. Geological Survey maps and flow data. Base map: OpenFreeMap and OpenMapTiles.

Conditions

At the Green River near Colrain, MA gauge, on this water: flow 19.8 cubic feet per second (Nov 3, 2026, 9:00 AM EST), water temperature 7.4 C.

  • Cold water (under 15 C) keeps bacteria alive longer.

Water level 2.7 feet. The National Weather Service flood stage at this gauge is 7 feet (National Weather Service gauge page).

Conditions are measured at the gauge, not at this spot, and do not change the status.

Source: U.S. Geological Survey via Water Data for the Nation, gauge 01170100, reading Nov 3, 2026, 9:00 AM EST, retrieved 2026-11-03 14:46 UTC; flood stage: NOAA National Weather Service, gauge CRNM3. Gauge chosen by DirtyWaterWatch. · Readings and history at USGS

Check Greenfield Water Pollution Control Facility's notices · Bookmark this water page and check it before each trip · Report a missing notice or error

About this status

No current status shown: no report we track sets a status on this water now; how statuses work. No status does not mean the water is safe. Follow posted signs and local health advice.

Sources checked: MassDEP CSO API behind the portal (last successful check 2026-11-03 14:39 UTC). Status by DirtyWaterWatch, updated 2026-11-03 14:48 UTC. · Updated

Reports in Massachusetts can appear days after a discharge; a quiet map can mean a report has not appeared yet. How Massachusetts reports

Estimated downstream stretches on Green RIver

none with a current status

No downstream stretch has a current status here as of Nov 3, 2026, 9:48 AM EST. Check the reports below.

The last 90 days

Last 90 days, hour by hour. Red: discharge or advisory reported. Amber: caution. Hatched amber: end not confirmed. Plum: algal bloom advisory. Red or amber with a light line inside: beach advisory or caution. Dotted: monthly report (days with discharge, dates not given). Grey: no current status on the water outline. Purple hatching: source update overdue.

No discharge, advisory or caution periods are shown for this water in this time span. Check downstream stretches and source coverage.

Source: DirtyWaterWatch calculations using the reports named above and the published status rules. Updated 2026-11-03 14:48 UTC.

Reported discharges over time

  • Discharges affecting the Green RIver in Massachusetts, last 12 months11 affecting this stretch: 1 reported in Massachusetts, none arriving from upstreamDecember 2025 to November 2026Verified reports where available, else notices; revisions and duplicates counted once. Arriving discharges are estimated from modeled downstream reaches.
  • Days with a discharge affecting the Green RIver in Massachusetts, last 12 months1Reported on the Green RIver in Massachusetts: 1 · Arriving from outfalls upstream, estimated: 0December 2025 to November 2026A day counts once however many discharges were under way on it. Verified reports where available, else notices; revisions and duplicates counted once.
  • Hours with a discharge or advisory status on the Green RIver in Massachusetts, last 12 months0Reported on the Green RIver in Massachusetts: 0 · Arriving from outfalls upstream, estimated: 0December 2025 to November 2026Red hours by the map's rules: each discharge to its reported end plus the state's post-discharge period; overlapping hours count once.
  • 2026 season with a discharge or advisory status on the Green RIver in Massachusetts0.0%May to October 2026Share of May 1 to October 31 hours with red status by the map's rules, of the hours a source covered.
  • Records behind the last-90-days strip for the Green RIver in Massachusetts0Reported on the Green RIver in Massachusetts: 0 · Arriving from outfalls upstream, estimated: 0last 90 daysEvery distinct record the strip lists for its red, yellow and unresolved hours, notices and unresolved reports included; counted as the strip counts them.

Combined sewer overflow (CSO): sewage mixed with rainwater spills from a shared sewer system. Sanitary sewer overflow (SSO): sewage spills from a sewer meant to carry sewage separately from rainwater. Treatment bypass: wastewater skips one or more treatment steps. Blended discharge: wastewater that skipped some treatment is mixed with treated wastewater.

Reported discharges per month

7 reported discharges, January 2022 to November 2026. Counted from 6 source-confirmed or annual reports, 1 public notice.

  • Combined sewer overflow
  • Sanitary sewer overflow
  • Treatment bypass, blended or other
  • No tracked source for this period
  • Incomplete source coverage

No tracked source covers January 2022 to May 2022. Massachusetts portal records begin June 30, 2022. Verified Data Reports arrive after the month ends, so the latest months count public notices.

Source: Massachusetts Department of Environmental Protection sewage notification portal. Records cover June 30, 2022 to November 3, 2026.

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Hours with a discharge or advisory status per month

Hours when this water had a discharge or advisory status under DirtyWaterWatch rules.

  • Discharge or advisory reported
  • No tracked source for this period
  • Incomplete source coverage

No tracked source covers January 2022 to May 2022. 1 discharge report has no end time and is not marked ongoing; under DirtyWaterWatch rules it shows caution, not a discharge or advisory status, and adds no hours here. Massachusetts portal records begin June 30, 2022. Verified Data Reports arrive after the month ends, so the latest months count public notices.

Source: Massachusetts Department of Environmental Protection sewage notification portal. Records cover June 30, 2022 to November 3, 2026.

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Days with a reported discharge per month

A day counts when any counted discharge was under way on it, from its start to its reported end in Eastern Time; a report with no end counts its start day.

  • No tracked source for this period
  • Incomplete source coverage

No tracked source covers January 2022 to May 2022.

Source: Massachusetts Department of Environmental Protection sewage notification portal. Records cover June 30, 2022 to November 3, 2026.

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Reported volume per year

Gallons (axis: K thousand, M million), summed from the 6 reports that gave a volume as a number (1 did not).

  • Incomplete source coverage
Limited records

1 of 7 discharge reports gave no volume as a number; only numbers are summed.

Source: Massachusetts Department of Environmental Protection sewage notification portal. Records cover June 30, 2022 to November 3, 2026.

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Hours with a discharge or advisory status per year

Hours with a discharge or advisory status each year under DirtyWaterWatch rules; 2026 to date.

  • Discharge or advisory reported
  • Incomplete source coverage
Limited records

1 discharge report has no end time and is not marked ongoing; under DirtyWaterWatch rules it shows caution, not a discharge or advisory status, and adds no hours here.

Source: Massachusetts Department of Environmental Protection sewage notification portal. Records cover June 30, 2022 to November 3, 2026.

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Share of the May to October season with a discharge or advisory status

Share of the hours from May 1 to October 31 with a discharge or advisory status under DirtyWaterWatch rules.

  • Discharge or advisory reported
  • Season with incomplete source coverage

Seasons with incomplete source coverage: 2022. The share is of the hours a source covered. 1 discharge report has no end time and is not marked ongoing; under DirtyWaterWatch rules it shows caution, not a discharge or advisory status, and adds no hours here.

Source: Massachusetts Department of Environmental Protection sewage notification portal. Records cover June 30, 2022 to November 3, 2026.

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Reported discharges by calendar month, all years

Every counted discharge report, by the calendar month it began.

Months are summed over every year a tracked source covers; the table gives the number of years behind each month.

Source: Massachusetts Department of Environmental Protection sewage notification portal. Records cover June 30, 2022 to November 3, 2026.

Show table
How these charts are counted

We count each discharge once. Where a source publishes notices and confirmed reports, we use confirmed reports for an operator's month when available; otherwise we use notices. We combine revisions and exclude duplicate state reports copied by the U.S. Environmental Protection Agency (EPA). Monthly and yearly totals appear separately. Status hours follow this site's rules. Shaded gaps mean missing coverage, not zero discharges.

  • Massachusetts Department of Environmental Protection sewage notification portal: records from June 30, 2022 to the latest update

Reports linked to Green RIver

Sanitary sewer overflow (SSO): sewage spills from a sewer meant to carry sewage separately from rainwater.

Reports linked to Green RIver, newest first
WhenReportStatus
GREENFIELD WATER POLLUTION CONTROL FACILITY · SSO · volume not reported report · notice · mapended
GREENFIELD WATER POLLUTION CONTROL FACILITY · SSO · 20,881 gallons report · notice · mapended
to 9:30 PMGREENFIELD WATER POLLUTION CONTROL FACILITY · SSO · 20,881 gallons report · notice · mapended
GREENFIELD WATER POLLUTION CONTROL FACILITY · SSO · 497,330 gallons report · notice · mapended
to 8:15 PMGREENFIELD WATER POLLUTION CONTROL FACILITY · SSO · 497,330 gallons report · notice · mapended
to 9:25 PMGREENFIELD WATER POLLUTION CONTROL FACILITY · SSO · volume in each report mapended
GREENFIELD WATER POLLUTION CONTROL FACILITY · SSO · volume not reported report · notice · mapended
to Jul 22 ’23, 11:49 AMGREENFIELD WATER POLLUTION CONTROL FACILITY · SSO · 1.41 million gallons report · notice · mapended
to 3:45 PMGREENFIELD WATER POLLUTION CONTROL FACILITY · SSO · volume in each report mapended
GREENFIELD WATER POLLUTION CONTROL FACILITY · SSO · volume not reported report · notice · mapended
to 5:28 PMGREENFIELD WATER POLLUTION CONTROL FACILITY · SSO · 156,060 gallons report · notice · mapended

Sources: MassDEP CSO API behind the portal, retrieved 2026-11-02 10:58 UTC. A report's record id and times show when you hover or focus its "report" link.

Download these reports as CSV

All reports in Massachusetts by year: 2026 (1 here) · 2024 (2 here) · 2023 (10 here)

Wastewater outlets on this water

Outfall: a pipe or outlet where wastewater enters a water body.

No wastewater outlet in our records is linked to this water.

Sewer operators listed for this water: Greenfield Water Pollution Control Facility.

Boat launches

No public boat launch is listed in our records for this water.

Nearby waters

Sources covering this water

13 records linked to this water. Updated .