Nashua is situated where Porcupine Creek runs into the Milk River, a few miles farther on, the waters of these two streams flow into the Missouri near Fort Peck Dam. The building of the dam, at its peak in 1936, provided 10,456 jobs; it was completed in 1940. Fort Peck Interpretive Center and Museum feature two of Montana's largest aquariums showcasing native and game species of Fort Peck Lake and the Missouri River. In the main lobby a life size, fleshed-out model of Peck's Rex, the Tyrannosaurus Rex. Fort Peck Lake is a Montana treasure for its size and outdoor opportunities.