We surveyed the lakeshore dunes on Lakes Michigan, Huron, and Superior in the state of Michigan to determine the extent of the range and number of populations of the threatened Lake Huron locust (Trimerotropis huroniana Wlk.) (Orthoptera: Acrididae). The locust's distribution is determined by a combination of historical and recent influences. Historical factors include the glacial history of the state and probable competition from other banded-wing locusts. Recent factors are primarily anthropogenic, including major habitat disturbances in the form of development, recreational use, and revegetation efforts; but lake level changes may also influence small local populations. Our surveys indicate that the species is fairly tolerant of disturbance and currently secure in Michigan. The status of the species in adjoining Wisconsin and Ontario is not well known.