Shidler & Wilder Wells and Pumps
Petersburg, MI49270
Petersburg area wells typically penetrate surficial sand and/or clay, then significant clay units, followed by thick limestone bedrock beginning between 30 and 80 feet, often used as the final water-bearing formation.
Showing contractors within 60 miles of Petersburg. 41 results found.
A geological estimate for the Petersburg area.
Typical Well Depth
Static Water Level
Recommended Method
The representative geological profile for the Petersburg region consists predominantly of surficial sand (often brown or yellow) alternating with clay to depths between 10-40 feet. These are typically underlain by extended clay units, commonly reaching total thicknesses of 30-80 feet below grade. At depths of approximately 30-80 feet, most logs encounter consolidated bedrock—primarily limestone, sometimes with a transitional sandstone or shale above. The most common residential wells are finished in the upper limestone or occasionally associated water-bearing sand and gravel. Static water levels average between 35 and 50 feet below ground surface. A typical residential well depth for 5-15+ GPM is around 60-80 feet. High-capacity or greater-assurance wells generally finish between 80-110 feet.
Depth (Feet) | Formation Type | Description | Characteristics |
---|---|---|---|
0 – 10 ft | Sand (sometimes with topsoil) | Brown, yellow, or mixed sand, locally interbedded with black topsoil; commonly loose to medium consolidation. | Color: Brown/Yellow/Gray Hardness: Soft |
10 – 35 ft | Clay | Massive clay, can be yellow, gray, or brown; minor silt or sand stringers; locally water-stained; occasional interbeds of sand or gravel. | Color: Gray/Yellow/Brown Hardness: Medium-Plastic |
35 – 50 ft | Sand & Gravel (locally present, water-bearing) | Fine to coarse sand with gravel, generally water-bearing when present, may merge with adjacent clay units in some wells. | Color: Brown/Gray Hardness: Medium |
50 – 80 ft | Transition Zone: Shale/Sandstone (occasional) | Thin variable beds of shale, sandstone, or consolidated unidentified rock; present in some wells before main limestone; grades quickly into bedrock. | Color: Gray/Greenish Hardness: Hard |
80 – 110 ft | Limestone (main bedrock aquifer) | Gray limestone, frequently fractured, serves as primary water-producing zone for most wells in region. Thickness extends beyond maximum sampled well depths. | Color: Gray/White Hardness: Very Hard |