
Siirtola Well and Pump
Dollar Bay, MI49922
The typical geological profile for Dollar Bay consists of a surficial sand and/or clay layer, underlain by thick sequences of alternating clay (often sandy/clayey and occasionally gravelly), then capped by a sandstone or bedrock aquifer. Most wells reach water-bearing layers in sand/gravel zones or in fractured bedrock, with a static water level commonly between 16 and 60 feet below grade.
Showing contractors within 60 miles of Dollar Bay. 6 results found.
A geological estimate for the Dollar Bay area.
Typical Well Depth
Static Water Level
Recommended Method
Analysis of well logs from the Dollar Bay region in Houghton County, Michigan, reveals a general stratigraphy with initial surficial sand or sand-and-clay layers extending from surface to depths of approximately 20-40 ft. Beneath this, a significant series of interbedded sandy/clayey and occasionally gravel-bearing clay layers extends to approximately 100-150 ft, depending on the well. Below these unconsolidated sediments, the most common water-bearing zone is sandstone or fractured bedrock, which may start as shallow as 40 ft or as deep as 310 ft and can extend well beyond 400 ft in deeper wells. Most residential wells are completed between 75 and 160 ft to achieve yields of 5–15+ GPM, targeting the sand/gravel seams or the uppermost sandstone/bedrock aquifers.
Depth (Feet) | Formation Type | Description | Characteristics |
---|---|---|---|
0 – 3 ft | Sand | Surficial sand, minor silt or loam potential; highly permeable. | Color: Light tan to gray Hardness: Loose |
3 – 20 ft | Clay (sandy/clayey) | Sandy clay, sometimes with small gravels; frequently moist. | Color: Gray to brown Hardness: Soft to medium |
20 – 80 ft | Clay (sandy/gravelly interbeds) | Predominantly clay with interbeds of sand and occasional gravel; main confining layer. | Color: Gray, brown, or mixed Hardness: Medium |
80 – 120 ft | Sand, Gravelly or Water-Bearing Zone | Sand with variable gravel content, often water-bearing; primary target for screens. | Color: Light brown to gray Hardness: Loose-medium |
120 – 160 ft | Clay, Sandy/Gravelly | Clay with increasing coarse content, transitioning downward. | Color: Gray or tan Hardness: Medium |
160 – 401 ft | Bedrock (Sandstone, sometimes Basalt) | Fractured sandstone, occasionally basalt; main deep aquifer zone. | Color: Light brown/red (sandstone), dark (basalt) Hardness: Hard |