J. N. Weaver H. R. Covington 1990 <p>The Snake River Plain is a broad, arcuate region of low relief that extends more than 300 mi across southern Idaho. &nbsp;The Snake River enters the plain near Idaho Falls and flows westward along the southern margin of the eastern Snake River Plain (fig. 1), a position mainly determined by the basaltic lava flows that erupted near the axis of the plain. &nbsp;The highly productive Snake River Plain aquifer north of the Snake River underlies most of the eastern plain.</p> application/pdf 10.3133/i1947D en U.S. Geological Survey Geologic map and profiles of the north wall of the Snake River Canyon, Jerome, Filer, Twin Falls, and Kimberly quadrangles, Idaho reports