DirtyWaterWatch Public waters. Public record.

Vermont / Waters /

North Branch Winooski River

River in Vermont, past Elmore, Middlesex, Montpelier and Worcester

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 North Branch Winooski River at Wrightsville, VT gauge, on this water: flow 16 cubic feet per second (Nov 2, 2026, 4:00 PM EST).

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 04285500, reading Nov 2, 2026, 4:00 PM EST, retrieved 2026-11-02 21:22 UTC. Gauge chosen by DirtyWaterWatch. · Readings and history at USGS

Get alerts from City of Montpelier Water Resource Recovery Facility combined sewer system · Bookmark this water page and check it before each trip · Report a missing notice or error

About this status

Why this status: No current status: no report we track sets a status on this water outline now.

How long each status lasts, and why

Sources checked: VT DEC Public Alerts (untreated discharge alerts) on the Sewage Overflows report page (last successful check 2026-11-02 21:22 UTC). Status by DirtyWaterWatch, updated 2026-11-02 21:26 UTC.

No status does not mean the water is safe. Follow posted signs and local health advice.

Updated .

Estimated downstream stretches on North Branch Winooski River

No downstream stretch has a current status here as of Nov 2, 2026, 4:26 PM 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. 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 2026-11-02 21:26 UTC.

Reported discharges over time

  • Discharges affecting the North Branch Winooski River in Vermont, last 12 months11 affecting this stretch: 1 reported in Vermont, 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 North Branch Winooski River in Vermont, last 12 months2Reported on the North Branch Winooski River in Vermont: 2 · 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 North Branch Winooski River in Vermont, last 12 months50Reported on the North Branch Winooski River in Vermont: 50 · 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 North Branch Winooski River in Vermont1.1%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 North Branch Winooski River in Vermont0Reported on the North Branch Winooski River in Vermont: 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. Outfall: a pipe or outlet where wastewater enters a water body.

Reported discharges per month

24 reported discharges, January 2022 to November 2026. Counted from 24 source-confirmed or annual reports.

  • Combined sewer overflow
  • Sanitary sewer overflow
  • Treatment bypass, blended or other

Source: Vermont Department of Environmental Conservation sewage overflow page. Records cover January 1, 2022 to November 2, 2026.

Show table

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

3 discharge reports have no end time and are not marked ongoing; under DirtyWaterWatch rules they show caution, not a discharge or advisory status, and add no hours here.

Source: Vermont Department of Environmental Conservation sewage overflow page. Records cover January 5, 2016 to November 2, 2026.

Show table

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.

Source: Vermont Department of Environmental Conservation sewage overflow page. Records cover January 1, 2022 to November 2, 2026.

Show table

Reported discharges per year, 2016 to 2026

49 reported discharges, 2016 to 2026.

  • Combined sewer overflow
  • Sanitary sewer overflow
  • Treatment bypass, blended or other
  • Incomplete source coverage

Source: Vermont Department of Environmental Conservation sewage overflow page. Records cover January 5, 2016 to November 2, 2026.

Show table

Reported volume per year

Gallons (axis: K thousand, M million), summed from the 17 reports that gave a volume as a number (32 did not).

  • Incomplete source coverage

32 of 49 discharge reports gave no volume as a number (31 gave a range); only numbers are summed. Vermont gave volumes as ranges before 2024 (">10,000 to 100,000 gallons"); those records have no single number and are not summed.

Source: Vermont Department of Environmental Conservation sewage overflow page. Records cover January 5, 2016 to November 2, 2026.

Show table

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

3 discharge reports have no end time and are not marked ongoing; under DirtyWaterWatch rules they show caution, not a discharge or advisory status, and add no hours here.

Source: Vermont Department of Environmental Conservation sewage overflow page. Records cover January 5, 2016 to November 2, 2026.

Show table

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

3 discharge reports have no end time and are not marked ongoing; under DirtyWaterWatch rules they show caution, not a discharge or advisory status, and add no hours here.

Source: Vermont Department of Environmental Conservation sewage overflow page. Records cover January 5, 2016 to November 2, 2026.

Show table

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: Vermont Department of Environmental Conservation sewage overflow page. Records cover January 5, 2016 to November 2, 2026.

Show table

Reported discharges by wastewater outlet

Wastewater outlets with the most tracked discharge records: 4 of 4, all years. Counts depend on reporting coverage and do not measure legal compliance or harm.

Source: Vermont Department of Environmental Conservation sewage overflow page. Records cover January 5, 2016 to November 2, 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.

  • Vermont Department of Environmental Conservation sewage overflow page: records from January 5, 2016 to the latest update

Reports linked to North Branch Winooski River

Reports linked to North Branch Winooski River, newest first
StartEnd Sewer operator OutletTypeVolumeSourceLinks
May 14, 2026, 11:21 PM EDT May 15, 2026, 1:36 AM EDT Montpelier 009 CSO 009 - 152 Main St. Combined sewer overflow (CSO) 60,416 gallons Montpelier (incident report on the VT DEC Sewage Overflows page; reviewed by DEC) via VT DEC Public Alerts (untreated discharge alerts) on the Sewage Overflows report page, record incident:6999, the source gives no report time, retrieved 2026-11-02 10:55 UTC · Read the original notice Read report: Combined sewer overflow (CSO), Montpelier, May 14, 2026, 11:21 PM EDT · Map
May 17, 2025, 4:50 PM EDT May 17, 2025, 10:20 PM EDT Montpelier 009 CSO 009 - 152 Main St Combined sewer overflow (CSO) 304,511 gallons Montpelier (incident report on the VT DEC Sewage Overflows page; reviewed by DEC) via VT DEC Public Alerts (untreated discharge alerts) on the Sewage Overflows report page, record incident:6819, the source gives no report time, retrieved 2026-11-02 10:55 UTC · Read the original notice Open record below · Map
Read the full record

See it in the archive for its year
start not reported (reported May 10, 2025, 7:46 AM EDT) end not reported Montpelier CSO 007- 10 Main St. CSO 009- 152 Main St. Combined sewer overflow (CSO)Earlier version volume not reported Montpelier (operator public alert on the VT DEC Sewage Overflows page; not yet reviewed by DEC) via VT DEC Public Alerts (untreated discharge alerts) on the Sewage Overflows report page, record alert:4122, reported May 10, 2025, 7:46 AM EDT, retrieved 2026-11-02 10:55 UTC · Read the original notice Open record below · Map
Read the full record

See it in the archive for its year
May 10, 2025, 7:10 AM EDT May 10, 2025, 8:55 AM EDT Montpelier 009 CSO 009- 152 Main St. Combined sewer overflow (CSO) 46,507 gallons Montpelier (incident report on the VT DEC Sewage Overflows page; reviewed by DEC) via VT DEC Public Alerts (untreated discharge alerts) on the Sewage Overflows report page, record incident:6783, the source gives no report time, retrieved 2026-11-02 10:55 UTC · Read the original notice Open record below · Map
Read the full record

See it in the archive for its year
Mar 16, 2025, 9:50 PM EDT Mar 17, 2025, 1:25 AM EDT Montpelier 009 CSO 09- 152 Main St Combined sewer overflow (CSO) 137,409 gallons Montpelier (incident report on the VT DEC Sewage Overflows page; reviewed by DEC) via VT DEC Public Alerts (untreated discharge alerts) on the Sewage Overflows report page, record incident:6747, the source gives no report time, retrieved 2026-11-02 10:55 UTC · Read the original notice Open record below · Map
Read the full record

See it in the archive for its year
Aug 11, 2024, 7:50 PM EDT Aug 11, 2024, 8:40 PM EDT Montpelier 009 CSO-009 152 Main St Combined sewer overflow (CSO) 81,527 gallons Montpelier (incident report on the VT DEC Sewage Overflows page; reviewed by DEC) via VT DEC Public Alerts (untreated discharge alerts) on the Sewage Overflows report page, record incident:6674, the source gives no report time, retrieved 2026-11-02 10:55 UTC · Read the original notice Open record below · Map
Read the full record

See it in the archive for its year
Aug 9, 2024, 6:50 PM EDT Aug 9, 2024, 7:40 PM EDT Montpelier 009 CSO-009 (152 Main St) Combined sewer overflow (CSO) 45,000 gallons Montpelier (incident report on the VT DEC Sewage Overflows page; reviewed by DEC) via VT DEC Public Alerts (untreated discharge alerts) on the Sewage Overflows report page, record incident:6675, the source gives no report time, retrieved 2026-11-02 10:55 UTC · Read the original notice Open record below · Map
Read the full record

See it in the archive for its year
start not reported (reported Jul 12, 2024, 6:42 AM EDT) end not reported Montpelier 009 CSO-09 152 Main St Combined sewer overflow (CSO)Earlier version volume not reported Montpelier (operator public alert on the VT DEC Sewage Overflows page; not yet reviewed by DEC) via VT DEC Public Alerts (untreated discharge alerts) on the Sewage Overflows report page, record alert:4029, reported Jul 12, 2024, 6:42 AM EDT, retrieved 2026-11-02 10:55 UTC · Read the original notice Open record below · Map
Read the full record

See it in the archive for its year
Jul 11, 2024, 10:50 AM EDT Jul 11, 2024, 12:45 PM EDT Montpelier 009 CSO-009 152 Main St Combined sewer overflow (CSO) 136,000 gallons Montpelier (incident report on the VT DEC Sewage Overflows page; reviewed by DEC) via VT DEC Public Alerts (untreated discharge alerts) on the Sewage Overflows report page, record incident:6571, the source gives no report time, retrieved 2026-11-02 10:55 UTC · Read the original notice Open record below · Map
Read the full record

See it in the archive for its year
Jul 10, 2024, 7:05 PM EDT Jul 11, 2024, 7:05 AM EDT Montpelier 009 CSO 009 - 152 Main St. Combined sewer overflow (CSO) 1.01 million gallons Montpelier (incident report on the VT DEC Sewage Overflows page; reviewed by DEC) via VT DEC Public Alerts (untreated discharge alerts) on the Sewage Overflows report page, record incident:6569, the source gives no report time, retrieved 2026-11-02 10:55 UTC · Read the original notice Open record below · Map
Read the full record

See it in the archive for its year
start not reported (reported Jul 7, 2024, 7:53 AM EDT) end not reported Montpelier CSO 007- 10 Main St. (siphon) CSO 009-152 Main St. Combined sewer overflow (CSO)Earlier version volume not reported Montpelier (operator public alert on the VT DEC Sewage Overflows page; not yet reviewed by DEC) via VT DEC Public Alerts (untreated discharge alerts) on the Sewage Overflows report page, record alert:4015, reported Jul 7, 2024, 7:53 AM EDT, retrieved 2026-11-02 10:55 UTC · Read the original notice Open record below · Map
Read the full record

See it in the archive for its year
Jul 6, 2024, 9:30 PM EDT Jul 6, 2024, 10:10 PM EDT Montpelier 009 CSO 009- 152 Main St. Combined sewer overflow (CSO) 35,507 gallons Montpelier (incident report on the VT DEC Sewage Overflows page; reviewed by DEC) via VT DEC Public Alerts (untreated discharge alerts) on the Sewage Overflows report page, record incident:6541, the source gives no report time, retrieved 2026-11-02 10:55 UTC · Read the original notice Open record below · Map
Read the full record

See it in the archive for its year
Jul 6, 2024, 6:50 AM EDT Jul 6, 2024, 7:15 AM EDT Montpelier 009 CSO 009- 152 Main St Combined sewer overflow (CSO) 44,048 gallons Montpelier (incident report on the VT DEC Sewage Overflows page; reviewed by DEC) via VT DEC Public Alerts (untreated discharge alerts) on the Sewage Overflows report page, record incident:6537, the source gives no report time, retrieved 2026-11-02 10:55 UTC · Read the original notice Open record below · Map
Read the full record

See it in the archive for its year
Mar 6, 2024, 11:45 PM EST Mar 7, 2024, 8:10 AM EST Montpelier 009 CSO 009 - 152 Main St. Combined sewer overflow (CSO) “>10,000 to 100,000 gallons” Montpelier (incident report on the VT DEC Sewage Overflows page; reviewed by DEC) via VT DEC Public Alerts (untreated discharge alerts) on the Sewage Overflows report page, record incident:6476, the source gives no report time, retrieved 2026-11-02 10:55 UTC · Read the original notice Open record below · Map
Read the full record

See it in the archive for its year
Dec 18, 2023, 3:28 PM EST Dec 18, 2023, 12:00 PM EST Montpelier Intersection of Barre St. and Main St. Sanitary sewer overflow (SSO) “>10,000 to 100,000 gallons” Montpelier (incident report on the VT DEC Sewage Overflows page; reviewed by DEC) via VT DEC Public Alerts (untreated discharge alerts) on the Sewage Overflows report page, record incident:6430, the source gives no report time, retrieved 2026-11-02 10:55 UTC · Read the original notice Open record below · Map
Read the full record

See it in the archive for its year
Dec 18, 2023, 3:00 PM EST Dec 19, 2023, 9:55 PM EST Montpelier CS0 008- Intersection of Main St and Barre St Combined sewer overflow (CSO) 1.4 million gallons Montpelier (incident report on the VT DEC Sewage Overflows page; reviewed by DEC) via VT DEC Public Alerts (untreated discharge alerts) on the Sewage Overflows report page, record incident:6434, the source gives no report time, retrieved 2026-11-02 10:55 UTC · Read the original notice Open record below · Map
Read the full record

See it in the archive for its year
start not reported (reported Dec 18, 2023, 6:28 AM EST) end not reported Montpelier 009 CSO009- 152 Main St Report not fully readEarlier version volume not reported Montpelier (operator public alert on the VT DEC Sewage Overflows page; not yet reviewed by DEC) via VT DEC Public Alerts (untreated discharge alerts) on the Sewage Overflows report page, record alert:3949, reported Dec 18, 2023, 6:28 AM EST, retrieved 2026-11-02 10:55 UTC · Read the original notice Open record below · Map
Read the full record

See it in the archive for its year
Dec 18, 2023, 6:10 AM EST Dec 19, 2023, 2:45 AM EST Montpelier 009 CSO 009- 152 Main St Combined sewer overflow (CSO) 2.19 million gallons Montpelier (incident report on the VT DEC Sewage Overflows page; reviewed by DEC) via VT DEC Public Alerts (untreated discharge alerts) on the Sewage Overflows report page, record incident:6433, the source gives no report time, retrieved 2026-11-02 10:55 UTC · Read the original notice Open record below · Map
Read the full record

See it in the archive for its year
Aug 30, 2023, 10:40 AM EDT Aug 30, 2023, 11:40 AM EDT Montpelier 009 CSO - 009 - 152 Main St. Combined sewer overflow (CSO) 81,048 gallons Montpelier (incident report on the VT DEC Sewage Overflows page; reviewed by DEC) via VT DEC Public Alerts (untreated discharge alerts) on the Sewage Overflows report page, record incident:6394, the source gives no report time, retrieved 2026-11-02 10:55 UTC · Read the original notice Open record below · Map
Read the full record

See it in the archive for its year
start not reported (reported Aug 16, 2023, 1:03 PM EDT) end not reported Montpelier 009 CSO 009 - 152 main St. Combined sewer overflow (CSO)Earlier version volume not reported Montpelier (operator public alert on the VT DEC Sewage Overflows page; not yet reviewed by DEC) via VT DEC Public Alerts (untreated discharge alerts) on the Sewage Overflows report page, record alert:3923, reported Aug 16, 2023, 1:03 PM EDT, retrieved 2026-11-02 10:55 UTC · Read the original notice Open record below · Map
Read the full record

See it in the archive for its year
Aug 16, 2023, 10:51 AM EDT Aug 16, 2023, 3:31 PM EDT Montpelier CSO OO9 - 152 Main St. Combined sewer overflow (CSO) “>100,000 to 500,000 gallons” Montpelier (incident report on the VT DEC Sewage Overflows page; reviewed by DEC) via VT DEC Public Alerts (untreated discharge alerts) on the Sewage Overflows report page, record incident:6380, the source gives no report time, retrieved 2026-11-02 10:55 UTC · Read the original notice Open record below · Map
Read the full record

See it in the archive for its year
start not reported (reported Jul 17, 2023, 4:16 PM EDT) end not reported Montpelier CSO 007-10 Main St CSO 009-North Branch Combined sewer overflow (CSO)Earlier version volume not reported Montpelier (operator public alert on the VT DEC Sewage Overflows page; not yet reviewed by DEC) via VT DEC Public Alerts (untreated discharge alerts) on the Sewage Overflows report page, record alert:3907, reported Jul 17, 2023, 4:16 PM EDT, retrieved 2026-11-02 10:55 UTC · Read the original notice Open record below · Map
Read the full record

See it in the archive for its year
Jul 16, 2023, 9:30 PM EDT Jul 16, 2023, 10:00 PM EDT Montpelier 009 CSO 009-152 Main St Combined sewer overflow (CSO) 6,656 gallons Montpelier (incident report on the VT DEC Sewage Overflows page; reviewed by DEC) via VT DEC Public Alerts (untreated discharge alerts) on the Sewage Overflows report page, record incident:6328, the source gives no report time, retrieved 2026-11-02 10:55 UTC · Read the original notice Open record below · Map
Read the full record

See it in the archive for its year
start not reported (reported Jul 10, 2023, 11:18 AM EDT) end not reported Montpelier 009 CSO 009 - 152 Main St. Combined sewer overflow (CSO)Earlier version volume not reported Montpelier (operator public alert on the VT DEC Sewage Overflows page; not yet reviewed by DEC) via VT DEC Public Alerts (untreated discharge alerts) on the Sewage Overflows report page, record alert:2880, reported Jul 10, 2023, 11:18 AM EDT, retrieved 2026-11-02 10:55 UTC · Read the original notice Open record below · Map
Read the full record

See it in the archive for its year
Jul 10, 2023, 1:51 AM EDT Jul 13, 2020, 6:54 AM EDT Montpelier 009 CSO 009 - 152 Main St. Combined sewer overflow (CSO) “>1,000,000 gallons” Montpelier (incident report on the VT DEC Sewage Overflows page; reviewed by DEC) via VT DEC Public Alerts (untreated discharge alerts) on the Sewage Overflows report page, record incident:6339, the source gives no report time, retrieved 2026-11-02 10:55 UTC · Read the original notice Open record below · Map
Read the full record

See it in the archive for its year

Showing the latest 25 records of 84 records. See them all with filters.

All reports in Vermont by year: 2026 (1 here) · 2025 (4 here) · 2024 (9 here) · 2023 (16 here) · 2022 (6 here) · 2021 (1 here) · 2020 (9 here) · 2019 (12 here) · 2018 (9 here) · 2017 (14 here) · 2016 (3 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: City of Montpelier Water Resource Recovery Facility combined sewer system.

Boat launches

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

Nearby waters

Sources covering this water

84 records linked to this water. Updated .