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1958 Map of Lewis Reservoir

Name: 1958 Topographic Map of Lewis Reservoir
Creator: U.S. Geological Survey
Published: 1960
License: https://creativecommons.org/publicdomain/mark/1.0/

USGS Topo · Published 1960

About this map

The Fort Peck Game Range dominates this landscape in Valley County, Montana, where a complex network of coulees and ridges drains into the northern reaches of the Fort Peck Reservoir. Mapped during the late 1950s as part of the Missouri River Basin development program, the area showcases extensive water management efforts, including the Willow Flat Diversion Dam and several small catchments such as Lewis Reservoir and Lost McMenomey Reservoir.

A notable land-use feature is the Rentention Levees Experimental Area in the northwest, reflecting mid-century federal experiments in soil and water conservation. The topography is defined by a succession of high ground, including Second Ridge and Fifth Ridge, separated by deep drainage channels like Skunk Coulee and Sixth Coulee. This detailed survey preserves the early shoreline and reservoir boundaries before subsequent landscape changes.