Well Drillers Near Cheyenne, Wyoming

A geological estimate for the Cheyenne area.

Detailed Summary

A synthesis of representative well log data for the Cheyenne region (Weld County, township 12N, ranges 65-67W) indicates the most probable subsurface sequence is: 1) surficial silt, clay or loess (0-5 ft); 2) brown to yellow clayey sand and gravel, sometimes with caliche or silt/sand lenses (5-40 ft); 3) sandy, clayey gravel, becoming compact with depth (40-90 ft); 4) claystone or fine sand/shale interbeds (90-150 ft); and 5) hard, dark gray shale or sandstone (Pierre, Laramie, or 'High Plains' units) from ~150+ ft downward. Reliable residential supplies (5-15 GPM) are usually reached by 230-350 ft; higher capacity wells may be screened to 500-600 ft. Domestic yield is commonly drawn from basal gravel/sand or upper consolidated sandstone in Laramie/High Plains aquifers. Static water levels vary widely but are most typically found between 150-400 ft. All values represent weighted means and modal values from area logs, omitting deep or anomalous bores.

Expected Geological Layers