What is the current flow on Marengo River?

Marengo River was running 35 cubic feet per second as of Aug 1, 2026, 6:00 PM UTC, measured at USGS gauge 04026740. This is a build-time snapshot rather than a live reading — check the USGS gauge directly before relying on it.

Does Marengo River hold wild trout?

Yes. The state classifies Marengo River as Class II (some natural reproduction) across 14 miles of stream. That classification means natural reproduction, not stocking. Source: Wisconsin DNR Classified Trout Streams.

Marengo River

Wisconsin. Classified Class II (some natural reproduction) by the state across 14 miles. Running 35 cfs as of Aug 1, 2026, 6:00 PM UTC.

Latest Reading

cubic feet / second

USGS gauges

Flow measured Aug 1, 2026, 6:00 PM UTC at gauge 04026740. These are build-time snapshots, not a live feed — check the USGS gauge before relying on them.

State Trout Classification

Classification	Class II (some natural reproduction)
Classified length	14 miles

Source: Wisconsin DNR Classified Trout Streams.

USGS Gauges on Marengo River

Gauge	Station	Water temp?
040265935	MARENGO RIVER AT FOUR CORNERS RD NR MASON, WI	—
040265981	MARENGO RIVER AT RIEMER ROAD NR MARENGO, WI	—
04026740	MARENGO RIVER NEAR MELLEN, WI	—

Fly fishing rivers →Wisconsin trout water →Wisconsin lakes →

Conditions: USGS NWIS (public domain). Classification: Wisconsin DNR Classified Trout Streams.