USGS stream gauge 04159130 · Michigan

St. Clair River at Port Huron, MI

As of Oct 28, 2026, 7:00 AM EDT, this gauge read a gage height of 577.73 ft and a flow of 194,000 cfs. Over the past 7 days the water level fell 0.17 ft. Data from the USGS.

Updated Oct 28, 2026, 7:25 AM EDT (USGS Water Data snapshot)

Gage height

577.73 ft

7-day range 577.65–578.24 ft

Discharge

194,000cfs

7-day range 185,000–218,000 cfs

Latest reading

26 min ago

Oct 28, 2026, 7:00 AM EDT

Readings are provisional USGS data and may be revised. Rivers can rise fast after rain upstream. For flood warnings, check weather.gov and follow local authorities.

Gage height, past 7 days

578578578578578Oct 21Oct 22Oct 23Oct 24Oct 25Oct 26Oct 27
Gage height (ft), hourly, past 7 days. Low 578 · High 578.

Discharge, past 7 days

182,360191,930201,500211,070220,640Oct 21Oct 22Oct 23Oct 24Oct 25Oct 26Oct 27
Discharge (cfs), hourly, past 7 days. Low 185,000 · High 218,000.

Chart dates are in Michigan local time (America/Detroit).

Reading this gauge

Gage height is the water surface level above this station's own reference point, so 577.73 ft is not the river depth and cannot be compared with other gauges. Discharge, the volume of water flowing past each second, is the better number for comparing conditions over time and between rivers.

Station details
USGS site number04159130
Official nameST. CLAIR RIVER AT PORT HURON, MI
StateMichigan
Drainage area222,400 sq mi
Coordinates42.9870° N, 82.4246° W

Source: USGS Water Data for the Nation, site 04159130. Parameters 00065 (gage height) and 00060 (discharge).

USGS station page View on OpenStreetMap Michigan earthquakes

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