
Check which species have trophy potential in Willow Creek Reservoir
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Willow Creek Reservoir is a lake located in Madison County, Montana, United States. It is most popular for fishing Brown trout and Rainbow trout.
Learn what time of year and day to go fishing at Willow Creek Reservoir. Download Fishbrain today to look for new fishing spots, scout new fishing access, or prep for your next trip.

Disclaimer: Always check local fishing regulations, water access rights and land ownership before fishing, regardless of any catches logged in that area by the Fishbrain community. Fishbrain has mapped millions of acres of government-owned land across the USA to help you identify potential fishing access, but you are responsible for ensuring compliance with all legal requirements.
Fishing regulations in Montana can change throughout the year. Make sure to check this page before fishing for the most up to date rules and regulations for the current season. Local regulations govern when you can fish, the max size of the fish you can keep, how many fish you can keep, and more.
Below you will see fishing regulations for catching Brown trout as of April 1st, 2026. To view regulations for a different fish species, please click on your preferred species in the drop-down.
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Bag limit
Memorable
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Aggregate
Special Combined Bag and Length Limits:
Lakes/Reservoirs: 5 daily and 10 in possession, includes cutthroat trout.
Rivers/Streams: 5 daily and in possession, only 1 over 18 inches, only 1 can be a cutthroat trout. All arctic grayling must be released immediately.
For more information please see Montana Fishing Regulations, Central Region
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