Martinsdale Reservoir sits on the county line between Meagher and Wheatland Counties. The reservoir was created by the building of a Works Progress Administration (WPA) dam in the 1930s for the multiple uses of fishing, waterfowl hunting, and irrigation storage. Unlike many irrigation storage reservoirs, Martinsdale is not hampered by severe draw-down and water fluctuations; consequently, fishing is good almost year-round. Martinsdale is holding its own as a rainbow and brown trout fishery, though it receives heavy fishing pressure all year. FWP has also begun planting Yellowstone cutthroat trout. Trolling and shore-fishing are both popular here, but most anglers use boats, as Martinsdale is a fairly large body of water— 1,000 acres.
Trollers report good success between 10 and 15 feet deep using standard spoons and artificial lures, although cowbells and worms yield fish too. Local anglers suggest that you should easily catch your limit of 12- to 16-inch rainbows and browns. If you shore-fish and let your bait sit on the bottom too long, you are liable to hook a sucker or two, but currently such rough fish pose no threat to the overall health of the reservoir. Winter-ice fishing at the reservoir attracts many visitors from Billings, Roundup, and Bozeman.
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