What are foundation conditions like in Tahlequah, Oklahoma?

Reviewed by Preston · Updated 2026-11-12

In short: Tahlequah has a mix of ground: about 22% high shrink-swell soil, 2% moderate and 66% low ¹.

What does the soil survey show for Tahlequah?

Tahlequah covers about 13 square miles ² and had 16,209 people in the 2020 Census ².

Which soils matter most for houses in Tahlequah?

• Clarksville, about 16% of the area ¹: Very deep, somewhat excessively drained soils formed in hillslope sediments and the underlying clayey residuum from cherty dolomite or cherty limestone on steep side slopes and narrow ridgetops ³.
• Eldorado, about 15% of the area ¹: Very deep, well drained soils that formed in residuum weathered from Pennsylvanian age cherty limestone ⁴.
• Newtonia, about 11% of the area ¹: Very deep well drained soils that formed in loess and residuum of the Cherokee Prairies ⁵.
• Okemah, about 8% of the area ¹: Very deep, somewhat poorly drained soils that formed in material weathered from loamy and clayey alluvium or colluvium from shale of Pennsylvanian age ⁶.
• Jay, about 4% of the area ¹: Very deep, moderately well drained, slowly permeable soils that formed in loamy material overlying siltstone or cherty limestone ⁷.
• Britwater, about 24%, is land the survey does not rate as soil ¹.

What does this mean for houses in Tahlequah?

Mixed ground. No single hazard dominates here, so what matters is the soil under a particular house: clay that swells and shrinks with the seasons, fill on graded lots, and water around the foundation. See shrink-swell and the active zone and surface drainage and grading.

Which soils cover Tahlequah?

Looking for a foundation company near Tahlequah?

Companies that serve Tahlequah can appear on the company map in the Homeowner Hub. Paid listings there are marked Sponsored; the library and the AI guide don't rank or recommend any of them.

Buying or selling a house in Tahlequah? Realtors who serve the area can be on the same map, also marked Sponsored, and for realtors covers the seller disclosure form, inspections and the sale timeline. Seeing cracks at home? Start with for homeowners.

How were these numbers measured?

We overlaid the city limits from the Census Bureau ² on the USDA soil survey's map units ¹ and added up the area of each soil. Where a map unit is a mix of soils, its area was split by the percentages the survey lists for its major soils, so shares leave out minor inclusions and do not add to 100%. Shrink-swell is rated by the linear extensibility of a soil's most expansive layer, the survey's measure of how much it changes length between wet and dry (6% or more is high). Water table, bedrock and flooding come from the survey's map-unit summaries: the shallowest water table in any month, the shallowest bedrock, and the most common flooding frequency. Bedrock here includes soft, weathered sandstone and shale that a pier can push through, so it is not the depth where piers stop. These are mapped averages, not a test of any one lot; fill, grading and the soil actually under a house can differ, which is why a site visit or soil boring still decides a repair.

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• Shrink-swell and the active zone