Does Ontonagon River -Wis hold wild trout?

Yes. The state classifies Ontonagon River -Wis as Class II (some natural reproduction) across 4.67 miles of stream. That classification means natural reproduction, not stocking. Source: Wisconsin DNR Classified Trout Streams.

Ontonagon River -Wis

Wisconsin. Classified Class II (some natural reproduction) by the state across 4.67 miles.

State Trout Classification

Classification	Class II (some natural reproduction)
Classified length	4.67 miles

Source: Wisconsin DNR Classified Trout Streams.

Fly fishing rivers →Wisconsin trout water →Wisconsin lakes →

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