DirtyWaterWatch Public waters. Public record.

Michigan / Waters /

Montreal River

River in Michigan, past Ironwood

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

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.

Check Gogebic-Iron Wastewater Authority'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: a public source (last successful check 2026-11-05 01:05 UTC); a public source (last successful check 2026-11-05 01:05 UTC); EGLE MiEnviro CSO/SSO List (last successful check 2026-11-05 01:08 UTC). Status by DirtyWaterWatch, updated 2026-11-05 01:25 UTC. · Updated

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.
  • Caution: to
    1 report: Gogebic-Iron Wastewater Authority 1
    Show records

    The records are also in the report table on this page.

  • Discharge or advisory reported: to
    1 report: Gogebic-Iron Wastewater Authority 1
    Show records

    The records are also in the report table on this page.

Source: DirtyWaterWatch calculations using the reports named above and the published status rules. Updated 2026-11-05 01:25 UTC.

Reported discharges over time

  • Discharges affecting the Montreal River in Michigan, last 12 months22 affecting this stretch: 2 reported on the Montreal River; 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 Montreal River in Michigan, last 12 months4Reported on the Montreal River in Michigan: 4 · Arriving from outfalls upstream, estimated: 0 (counted apart; together they need not equal the total)December 2025 to November 2026A day counts once however many discharges were under way on it.
  • Hours with a discharge or advisory status on the Montreal River in Michigan, last 12 months46Reported on the Montreal River in Michigan: 46 · 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 Montreal River in Michigan0.0%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 Montreal River in Michigan1Reported on the Montreal River in Michigan: 1 · 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

12 reported discharges, January 2022 to November 2026.

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

Source: mi-egle-mienviro-cso-sso-list. Records cover January 1, 2022 to November 4, 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

Source: mi-egle-mienviro-cso-sso-list. Records cover January 1, 2001 to November 4, 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: mi-egle-mienviro-cso-sso-list. Records cover January 1, 2022 to November 4, 2026.

Show table

Reported discharges per year, 2001 to 2026

66 reported discharges, 2001 to 2026.

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

Source: mi-egle-mienviro-cso-sso-list. Records cover January 1, 2001 to November 4, 2026.

Show table

Reported volume per year

Gallons (axis: K thousand, M million), summed from the 65 reports that gave a volume as a number (1 did not).

1 of 66 discharge reports gave no volume as a number; only numbers are summed.

Source: mi-egle-mienviro-cso-sso-list. Records cover January 1, 2001 to November 4, 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

Source: mi-egle-mienviro-cso-sso-list. Records cover January 1, 2001 to November 4, 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

Source: mi-egle-mienviro-cso-sso-list. Records cover January 1, 2001 to November 4, 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: mi-egle-mienviro-cso-sso-list. Records cover January 1, 2001 to November 4, 2026.

Show table

Reported discharges by wastewater outlet

Wastewater outlets with the most tracked discharge records: 9 of 9, all years. Counts depend on reporting coverage and do not measure legal compliance or harm.

Source: mi-egle-mienviro-cso-sso-list. Records cover January 1, 2001 to November 4, 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.

  • U.S. Environmental Protection Agency sewer overflow records: records from May 3, 2022 to the latest update (limited records)
  • mi-egle-mienviro-cso-sso-list: records from January 1, 2001 to the latest update

Reports linked to Montreal River

Reports linked to Montreal River, newest first
WhenReportStatus
to 3:05 PMGogebic-Iron Wastewater Authority · Oxidation ditch contents overflowed the tank and approximately 100 gallons spilled onto the ground. · Bypass · 100 gallons report · notice · mapended
to Apr 14, 3:25 AMGogebic-Iron Wastewater Authority · 002 Outfall from Flow Equal Basin · Bypass · 3.25 million gallons report · notice · mapended
to Apr 18 ’25, 9:46 AMGogebic-Iron Wastewater Authority · 002 Outfall from Flow Eq Basin (Old WWTP) · Bypass · 156,000 gallons report · notice · mapended
to May 22 ’24, 2:09 AMGogebic-Iron Wastewater Authority · 002 002 · Bypass · 42,000 gallons report · notice · mapended
to May 6 ’23, 4:06 AMGogebic-Iron Wastewater Authority · 002 F.E. Discharge · Bypass · 2.69 million gallons report · notice · mapended
to Apr 30 ’23, 1:28 AMGogebic-Iron Wastewater Authority · 002 F.E. Discharge · Bypass · 295,000 gallons report · notice · mapended
to Apr 22 ’23, 9:34 AMGogebic-Iron Wastewater Authority · 002 Flow Equalization Discharge · Bypass · 4.66 million gallons report · notice · mapended
to Apr 17 ’23, 2:38 AMGogebic-Iron Wastewater Authority · 002 Flow Equalization Discharge · Bypass · 18.03 million gallons report · notice · mapended
to 8:24 PMGogebic-Iron Wastewater Authority · 002 002 · Bypass · 218,000 gallons report · notice · mapended
to 9:51 AMGogebic-Iron Wastewater Authority · 002 Flow Equalization Bypass · Bypass · 14,000 gallons report · notice · mapended
to 4:24 PMGogebic-Iron Wastewater Authority · 002 Outfall 002 · Bypass · 16,000 gallons report · notice · mapended
to Apr 14 ’22, 12:00 PMGogebic-Iron Wastewater Authority · 002 002 Outlet Structure · Bypass · 2.45 million gallons report · notice · mapended
to Apr 29 ’20, 6:20 AMGogebic-Iron Wastewater Authority · 002 Effluent from flow equalization system · Bypass · 301,500 gallons report · notice · mapended
to Apr 8 ’20, 2:00 AMGogebic-Iron Wastewater Authority · 002 Flow Equalization Discharge · Bypass · 294,000 gallons report · notice · mapended
to Apr 4 ’20, 3:15 AMGogebic-Iron Wastewater Authority · 002 Discharge from flow equalization · Bypass · 536,000 gallons report · notice · mapended
to 5:00 PMGogebic-Iron Wastewater Authority · 002 Discharge from flow equalization · Bypass · 822,000 gallons report · notice · mapended
to Apr 23 ’19, 1:00 PMGogebic-Iron Wastewater Authority · WWTP Mh - N/a · SSO · 126,000 gallons report · notice · mapended
to Apr 23 ’19, 8:45 PMGogebic-Iron Wastewater Authority · 002 Discharge from Flow Equalization · Bypass · 3.91 million gallons report · notice · mapended
to Apr 18 ’19, 9:00 AMGogebic-Iron Wastewater Authority · 002 Flow Equalization · Bypass · 364,000 gallons report · notice · mapended
to Apr 9 ’19, 8:00 AMGogebic-Iron Wastewater Authority · Equilization Basin - 002 · Bypass · 4.44 million gallons report · notice · mapended
to 4:00 PMGogebic-Iron Wastewater Authority · manhole at wwtp gate - The location of the manhole is in the entrance driveway to the treatment plant · SSO · 180,000 gallons report · notice · mapended
to Oct 11 ’18, 1:00 PMGogebic-Iron Wastewater Authority · MH adjacent to Gogebic WWTP · SSO · 7.93 million gallons in all mapended
to Aug 28 ’18, 5:00 AMGogebic-Iron Wastewater Authority · MH adjacent to Gogebic WWTP · SSO · 1.05 million gallons in all mapended

Sources: EGLE MiEnviro CSO/SSO List, retrieved 2026-11-05 01:07 UTC. A report's record id and times show when you hover or focus its "report" link.

Download these reports as CSV

Showing the latest 25 records of 67 records.See them all with filters.

All reports in Michigan by year: 2026 (2 here) · 2025 (1 here) · 2024 (1 here) · 2023 (4 here) · 2022 (4 here) · 2020 (4 here) · 2019 (5 here) · 2018 (7 here) · 2017 (1 here) · 2016 (5 here) · 2015 (3 here) · 2014 (9 here) · 2013 (7 here) · 2011 (1 here) · 2010 (1 here) · 2006 (2 here) · 2005 (2 here) · 2003 (3 here) · 2002 (3 here) · 2001 (2 here)

Wastewater outlets on this water

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

Sewer operators listed for this water: Gogebic-Iron Wastewater Authority.

Boat launches

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

Nearby waters

Sources covering this water

66 records linked to this water, besides 1 earlier version or duplicate. Updated .