Several looped hiking trails lead to small lakes in the Lolo National Forest north of Thomspon Falls [1].
Reach the Four Lakes Creek trailhead by driving north on Thompson River Road (which intersects Highway 200 five miles east of town) about six miles, turn left onto the West Fork Thompson River Road, and follow it, bearing left as it becomes Four Lakes Creek Road (Forest Service Road 7669), some eight miles to the trailhead. A Lolo National Forest map will detail the trails.
Fishing access to the Thompson River is easy; a road runs along it almost the entire way from Highway 200 north to Highway 2. Expect to pull mostly rainbow trout, and perhaps some brown trout, from the stretch near Highway 200.
Links:
[1] http://www.moon.com/destinations/montana/missoula-and-northwestern-montana/the-lower-clark-fork/thompson-falls