Boulder River Fishing Report

This Boulder River fishing report is valid from November 1 through Thanksgiving, 2025.

We won’t fish here again until spring, but if you want to hit the lower river in the PM, use similar tactics as on the Yellowstone.

• Hatches:
• Dry Flies:
• Nymphs & Wets:
• Streamers:

Learn more about fishing the Boulder.

Learn more about our float trips, including on the Boulder.

Boulder River Streamflow Data

This stream gauge is near Big Timber, right at the bottom of the Boulder near its confluence with the Yellowstone. The Boulder actually runs slightly higher near the Boulder Forks Fishing Access, since a great deal of water is pulled off for irrigation downstream. Further upstream, the Boulder is much smaller, since the East and West Boulder both come in near Boulder Forks.

Flows under 300cfs are fishable on foot, 300-500 on foot or floating in an ultralight raft, 500-1500 both on foot and floating, and 1500 to 2500 only floating.

Boulder River Fishing Report – Relevant Links

• Mcleod Weather

Note: We update our general fishing report far more often than our fishery-specific reports like this one, especially between November and April.