Nashua is located above the Fort Peck Dam where the Porcupine Creek flows into the Milk River. It is believed that Nashua is the Indian term for 'meeting of two streams.' In the Milk River Valley from Havre to Nashua, it is possible to view steep river bluffs and deep gullies used by the Indians for bison kills, as well as tipi ring sites.
Nashua is located in northeastern Montana, on the US Highway 2 between Glasgow and Wolf Point.