South Sandstone Reservoir Professional Review and Guide
"South Sandstone Reservoir and dam, built in 1975, are fairly recent additions to the Montana State Recreation System. Facilities at the site include boat access, toilets, drinking water, camping and picnic areas, and shelter. FWP has planted northern pike, perch, and walleye; they appear to be doing well. Highest fishing success is reported in the spring and fall. Trolling and bank-fishing are both popular at this eastern Montana water hole.
If you have a boat and want to troll, don’t go too deep, because all you’ll get is the bottom. Worms and minnows are used extensively as well as standard pike lures, spoons, Rapalas, and jigs. FWP also planted largemouth and smallmouth bass, and crappie, here, and the largemouth population has fared well, producing good numbers of 1- to 2-pound bass. The smallmouth bass and crappie are less abundant."