Water Tables

Depth-to-water-table overlay. The shallower the table, the more likely heavy-rock conditions — and the higher the risk of breaching an underground spring. Higher risk score = costlier, riskier digs. · 18 areas

Region	State	Depth to water table	Spring risk	Rock risk		Notes
San Luis Basin	CO	2–6 ft	High	Moderate	10/10	Dewatering on anything below four feet.
Powder River	WY	2–6 ft	High	Moderate	10/10	Dewatering on anything below four feet.
Uinta Basin	UT	2–6 ft	High	Moderate	10/10	Dewatering on anything below four feet.
Front Range North	CO	4–8 ft	High	Moderate	9/10	Dewatering on anything below four feet.
Central Ridge	FL	4–8 ft	High	Moderate	9/10	Dewatering on anything below four feet.
Piedmont Triad	NC	4–8 ft	High	Moderate	9/10	Dewatering on anything below four feet.
Blue Ridge Foothills	NC	4–8 ft	High	Moderate	9/10	Dewatering on anything below four feet.
Arkansas Valley	CO	6–10 ft	Moderate	Moderate	8/10	Standard trenching; spot dewatering after rain.
Laramie Basin	WY	6–10 ft	Moderate	Moderate	8/10	Standard trenching; spot dewatering after rain.
Highland Rim	TN	6–10 ft	Moderate	Moderate	8/10	Standard trenching; spot dewatering after rain.
Wind River Corridor	WY	9–13 ft	Moderate	Moderate	7/10	Standard trenching; spot dewatering after rain.
Cache Valley	UT	9–13 ft	Moderate	Moderate	7/10	Standard trenching; spot dewatering after rain.
Tennessee Valley	TN	9–13 ft	Moderate	Moderate	7/10	Standard trenching; spot dewatering after rain.
Sandhills	NC	9–13 ft	Moderate	Moderate	7/10	Standard trenching; spot dewatering after rain.
Wasatch Front	UT	14–18 ft	Low	Low	6/10	Dry profile — no dewatering expected.
Panhandle East	FL	14–18 ft	Low	Low	6/10	Dry profile — no dewatering expected.
Nature Coast	FL	14–18 ft	Low	Low	6/10	Dry profile — no dewatering expected.
Cumberland Plateau	TN	14–18 ft	Low	Low	6/10	Dry profile — no dewatering expected.

Low risk (1–4) Moderate (5–6) High (7+) — shallow table / springs