
Sam's Well Drilling
Randolph, WI53956
Allenton area wells typically encounter layers of sand, clay, and gravel above limestone/dolomite bedrock. Usable residential wells generally penetrate to the upper limestone layers, with static water levels between 17 and 24 feet, and common yields of 10-20 GPM.
Showing contractors within 60 miles of Allenton. 41 results found.
A geological estimate for the Allenton area.
Typical Well Depth
Static Water Level
Recommended Method
Synthesizing well logs from the Allenton region, the most representative geological profile begins with surficial sand, clay, and gravel deposits extending from the surface to roughly 70-90 feet, followed by alternating sand/gravel and clay-silt lenses. The uppermost consolidated bedrock is typically limestone or dolomite starting near 70-90 feet. Some deeper wells reach dolomite/shale and, rarely, deep sandstone. Most residential wells are completed at depths of 120-200 feet targeting the limestone/dolomite aquifers, providing sufficient yield for domestic supply. High-capacity wells may be completed at greater depths, sometimes over 350 feet if targeting deeper sandstone or fractured dolomite.
Depth (Feet) | Formation Type | Description | Characteristics |
---|---|---|---|
0 – 15 ft | Sand/Gravel/Clay (Unconsolidated) | Brown to gray mixed sand, clay and gravel; surface soils and glacial drift, typically noncaving to slightly caving in some sections. | Color: Brown to Gray Hardness: Soft |
15 – 70 ft | Sand & Gravel/Interbedded Clay | Alternating water-bearing sand, sand & gravel, and clay lenses. May include silty and minor gravelly beds. | Color: Gray, Tan, Buff Hardness: Soft to Medium |
70 – 90 ft | Clay/Hardpan | Dense clay, sometimes with gravel inclusions, forms a semi-confining layer above bedrock. | Color: Dark gray to blue-gray Hardness: Hard |
90 – 200 ft | Limestone/Dolomite (Niagara/Local Formation) | Massive limestone and/or dolomite, sometimes shaley. Primary domestic aquifer, frequently water-bearing and fractured in upper sections. | Color: Buff, Tan, Gray Hardness: Hard |
200 – 350 ft | Shaley Dolomite or Galena Limestone | Shaley dolomite or fractured limestone, less common for domestic wells, targeted for higher capacity when present. | Color: Gray, Greenish, Tan Hardness: Very Hard |
350 – 375 ft | Sandstone (deep only, rare) | Fine to medium grained sandstone, sometimes targeted in deep high-capacity wells. | Color: Buff to Reddish Brown Hardness: Medium |