Missouri River Professional Review and Guide
"Big river, big tailwater, big trout. The scale of the Missouri River is simply huge. The Missouri is the largest river in the United States. Its upper reaches, so favored by anglers for trout, span more than 100 miles, from the junction of the Jefferson, Madison, and Gallatin at Three Forks to Cascade, high in the Montana’s arid steppe.
To varying degrees, each of the reservoirs provides cool holding water for rainbows and browns during the hottest days of summer. And in fall and spring, depending on their species and proclivities, large trout run up out of the impoundments to spawn. And each of the lakes slows the flow, allowing sediment to sift to the bottom, before the water is released into the next section of the river. Without these dams, and increasingly cooperative management by Montana Power Company, which now operates them, there would be few, if any, fishable trout in the Missouri below Three Forks. Species: Rainbow, brown. Angling methods: spin, and fly-fishing."