Well Drillers Near Croswell, Michigan

A geological estimate for the Croswell area.

Detailed Summary

Synthesizing the available well log records for the Croswell, MI area, the local geology is best described as a multi-layered glacial sequence. The near-surface is often a thin topsoil over brown or yellow sandy clay, followed by a thick interval of massive or stony gray clay, occasionally interbedded with silt or isolated sand lenses. In many cross-sections, thin to moderate beds of clean sand and/or gravel (sometimes water-bearing) appear at shallow to moderate depths (20-40 ft), but the main aquifer is a thicker, water-productive sand, sand/gravel, or fine sand unit at approximately 60-120 feet below grade. This basal unit typically supplies the best yields (5-20+ GPM for residential use) and is the most commonly targeted interval for screened well completions. Deeper massive clays may continue below, based on deeper wells south and west; however, the greatest reliance is on this intermediate sand/sand-gravel horizon. Grouting (typically with bentonite slurry) is often used to at least 40-100 ft, with PVC or steel casing set nearly to screen depth.

Expected Geological Layers