The lower Clark Fork, after the many small tributaries have entered, is characterized by long flat pools and broad riffles. A few small channels and log jams are present but it is generally mellow - excellent Mayfly water. This stretch of river is home to mostly Rainbow Trout and Brown Trout with a few Cutthroat in the mix. Like the middle river, the lower tends to fish best in the Spring through early Summer and then again in the late Summer through Fall.
The Clark Fork flows through downtown Missoula and fishes well both upstream and downstream from the city. Upstream from Missoula the river is small to medium sized with good numbers of Brown Trout and Rainbow Trout as well as a few Cutthroat Trout. Downstream from Missoula, after the Blackfoot and Bitterroot Rivers and Rock Creek have entered, the Clark Fork becomes a large river maintaining its main channel throughout its course. The lower Clark Fork is predominantly a Rainbow Trout fishery with fish averaging over 16 inches. The Clark Fork fishes well throughout the season.
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