Outside of the mountains, Southwest Montana is somewhat lacking in natural lakes. The valleys of Southwest Montana are generally very broad and somewhat arid—the moisture falls in the regions many mountain ranges, leaving little moisture for the valleys. As a result, Southwest Montana has only a handful of lakes and reservoirs that will interest anglers.
However, each of the waters in Southwest Montana are unique in their own way and can provide for very good fly fishing at the right times.
While generally not a destination spot for anglers on a Montana fly fishing trip, the lakes in southwest Montana make a fine and frequently scenic diversion away from the crowded rivers like the Big Hole River, Beaverhead River and the Ruby River.