History of Sand and Gravel Pits in Cass County
History of Sand and Gravel Pits in Cass County. Produced by William Moak for Environmental Geology of Omaha seminar, 12/99. A drive across northern Cass County or examination of the appropriate topographic map will reveal a landscape pockmarked by small lakes and ponds. These bodies of water are manmade and attest to the mining for sand and gravel along the Platte river.