Briggs sits on US-183 at FM 2657, near the Williamson County line, at about 1,100 feet of elevation. This is the transitional margin between the Lampasas Cut Plain and the eastern Edwards Plateau.
Expect clayey soils over Cretaceous limestone. The San Saba series is characteristic of this transition, and it is genuinely expansive: a Vertisol that hits hard limestone at roughly 24 to 40 inches, with cracks one to three inches wide reaching 20 inches or more down. That is an unusual combination, real seasonal movement in a soil that is also shallow to rock.
We should be honest that this assignment is regional inference rather than a Briggs-specific published survey, so we check the ground on site rather than quoting from a map.
There are no platted residential subdivisions here. Briggs is scattered rural residences and ranch tracts on acreage along US-183 and FM 2657, with a post office and two churches. Work here is long private drives, equipment pads and outbuilding slabs, not suburban flatwork.