06/12/2026
Fisheries staff with FWP have completed spring sampling, which provides estimates for trout abundances in southwestern Montana rivers. Results from these surveys are now available, along with abundance estimates from rivers that were sampled last fall.
Trout abundance estimates in many areas have increased, including some sections of the Beaverhead, Big Hole, Madison and Gallatin rivers.
For a full summary, visit fwp.mt.gov/homepage/news/2026/jun/0610-fish-estimates
This year’s spring sampling marked the third and final year of tagging trout in the Big Hole, Beaverhead, Ruby and lower Madison rivers, with tagging in the upper Madison River slated for this fall. Staff will continue monitoring tagged fish for the coming years to better understand how environmental conditions, such as water temperature and flows, influence survival, as well as potential angling effects.
Anglers who report catching tagged fish substantively contribute to the informed management of these fisheries by helping researchers identify individual fish. FWP and Montana State University have partnered with Montana Trout Unlimited to host drawings for guided fishing trips, equipment and other prizes for anglers who submit reports of catching fish with blue tags. Yellow tag reports are each worth a prize of $100. Reward opportunities will continue in 2026.
To learn more about the research effort and how to report a tagged fish, visit fwp.mt.gov/conservation/fisheries-management/trout-mgmt-sw-mt