Geography
Taylor County straddles two river watersheds
The Callahan Divide runs through Taylor County, separating land that drains north toward the Brazos River from land that drains south toward the Colorado River.
Taylor County sits in a transitional zone of West Texas. A geographic ridge called the Callahan Divide crosses the county. Rain that falls north of the divide flows toward the Brazos River system. Rain that falls south drains toward the Colorado River. Abilene sits near the divide at an elevation between about 1,672 and 2,410 feet above sea level.
The county covers 917 square miles. Average annual rainfall is about 23.59 inches — enough to support some dryland farming but dry enough that water supply is a real concern. If you are buying rural land, know which watershed you are in. Water rights and drainage patterns vary between the two basins.
Source to confirm: Handbook of Texas — Taylor County