Sinkhole risk in Tillman County, OK: No soluble rock mapped

The next step for one property

No soluble bedrock is mapped here, so natural sinkholes are unlikely. Collapses from broken pipes or old mines are a separate risk.

Across 871 square miles, under one square mile of Tillman County maps onto soluble rock. With about 6,736 residents (8 per square mile), much of the land is open, and the mapped rock may sit far from where people actually live. The figures come from 270 map points about 1.8 miles apart, so a pocket smaller than that can be missed or overstated.

Two things to read before deciding: how these percentages are measured, and the warning signs that apply anywhere.

Counties around Tillman County

The nearest county rated sinkhole country is Wilbarger County, TX, about 27 miles southwest, close enough that the same rock may run under the county line. 2 of the 6 closest counties land in the same band; the ground changes quickly around here.

• Wilbarger County, TX 27 mi southwest · 39% at surface
• Wichita County, TX 29 mi southeast · under 1% at surface
• Jackson County, OK 31 mi northwest · 34% at surface
• Cotton County, OK 32 mi east · 0% at surface
• Comanche County, OK 33 mi northeast · 13% at surface
• Kiowa County, OK 38 mi north · 4% at surface

Against the rest of Oklahoma

Tillman County ranks 77 of 77 in Oklahoma for soluble rock at the surface, and sits above 0% of US counties on that measure.

• Delaware County 94%
• Adair County 79%
• Caddo County 79%
• Harmon County 77%
• Cherokee County 66%