What are foundation and soil conditions in ZIP code 74171 (Tulsa)?

Reviewed by Preston · Updated 2026-11-12

In short: Only about 1% of ZIP code 74171 is mapped in high shrink-swell soil; 70% rates low ¹. The soil survey also maps occasional or frequent flooding on about 14% ¹.

What does the soil survey show for 74171?

ZIP code 74171 covers about 0 square mile of land and had 1,992 people in the 2020 Census ²; its center falls in Tulsa.

Which soils matter most for houses in 74171?

• Kamie, about 54% of the area ¹: Very deep, well drained soils that formed in material weathered from predominantly loamy alluvium of Pleistocene age ³.
• Radley, about 12% of the area ¹: Very deep, moderately well drained soils that formed in stratified silty alluvium ⁴.
• Mason, about 12% of the area ¹: Very deep moderately well drained soils that formed in material weathered from silty alluvium of Pleistocene Age ⁵.
• Dennis, about 5% of the area ¹: Very deep, somewhat poorly drained soils that formed in residuum weathered from shale of Pennsylvanian age ⁶.
• Glenpool, about 5% of the area ¹: Very deep, somewhat excessively drained, rapidly permeable soils that formed in material weathered from sandy wind blown deposits of Pleistocene age ⁷.

What does this mean for houses in 74171?

Flood-prone soils. Floodplain soils are layered stream deposits: softer, wetter and more variable than upland soils, and they flood. See soft soil consolidation and Quaternary alluvium and terraces.

Less clay, different problems. Sandy and loamy soils swell little, so movement more often comes from fill settlement, erosion and washouts or plumbing leaks.

Which soils cover 74171?

Looking for a foundation company near ZIP code 74171?

Companies that serve ZIP code 74171 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 ZIP code 74171? 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 ZIP code tabulation area (the Census approximation of a ZIP code) 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