Sugar River
Wisconsin. Classified Class II (some natural reproduction) by the state across 26.19 miles. Running 389 cfs as of Aug 1, 2026, 6:00 PM UTC.
Latest Reading
Flow measured Aug 1, 2026, 6:00 PM UTC at gauge 05436500. Temperature measured Aug 1, 2026, 6:00 PM UTC at gauge 05435950. These are build-time snapshots, not a live feed — check the USGS gauge before relying on them.
Water temperature and trout
Sugar River read 65.8°F as of Aug 1, 2026, 6:00 PM UTC. Trout come under thermal stress above roughly 68°F, and mortality after catch-and-release rises sharply in warm water. Montana FWP restricts angling when max daily water temperature reaches 73F for 3 consecutive days.
This reading sat below the stress threshold. Temperatures swing through the day and peak in late afternoon, so a morning reading can understate the daily maximum.
State Trout Classification
| Classification | Class II (some natural reproduction) |
| Classified length | 26.19 miles |
Source: Wisconsin DNR Classified Trout Streams.
USGS Gauges on Sugar River
Conditions: USGS NWIS (public domain). Classification: Wisconsin DNR Classified Trout Streams.