What are foundation and soil conditions in ZIP code 73065 (Newcastle)?

Reviewed by Preston · Updated 2026-11-12

In short: Only about 5% of ZIP code 73065 is mapped in high shrink-swell soil; 52% rates low ¹. The soil survey also maps bedrock within 40 inches under about 41% and occasional or frequent flooding on about 15% ¹.

What does the soil survey show for 73065?

ZIP code 73065 covers about 52 square miles of land and had 9,725 people in the 2020 Census ²; its center falls in Newcastle.

Which soils matter most for houses in 73065?

• Nash, about 13% of the area ¹: Moderately deep, well drained, moderately permeable upland soils that formed in material weathered from sandstone of Permian age ³.
• Stephenville, about 12% of the area ¹: Moderately deep, well drained, soils formed in material weathered from sandstone of Permian age ⁴.
• Grant, about 12% of the area ¹: Deep, well drained, moderately permeable soils ⁵.
• Gracemore, about 9% of the area ¹: Very deep, somewhat poorly drained, moderately rapid to rapidly permeable soils formed in calcareous sandy alluvium of Recent age ⁶.
• Lucien, about 9% of the area ¹: Shallow, well drained soils on the summits and shoulders of low hills that formed in material weathered from sandstone, interbedded with clay, siltstone, or sandy shale of Permian age ⁷.

What does this mean for houses in 73065?

Shallow rock. Where bedrock is close to the surface, lots are often cut into rock on one side and built up with fill on the other, so fill settlement and slope creep matter more than clay swell, and piers can stop at very different depths across one house. See depth to rock from borings.

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.

Which soils cover 73065?

Looking for a foundation company near ZIP code 73065?

Companies that serve ZIP code 73065 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 73065? 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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