Round Rockbr/Williamson County, Texasbr/30 31.040' N 97 41.827' Wbr/Directions: Start at the intersection of FM-620 and CR-173 in Round Rock. Go 200 yards north on CR-173. The Round Rock is on the right (east) side of the road in the middle of Brushy Creek.br/ br/Text: A guide for Indians and early settlers, this table-shaped stone in the middle of Brushy Creek once marked an important low-water wagon crossing. Hundred-year-old wheel ruts are still visible in the creek bottom. The rocky stream bed also provided building stone for pioneer homes. quot;Brushy Creekquot; post office was established in 1851 to serve the settlement that grew up near this natural ford. At the urging of postmaster Thomas C. Oatts, it was renamed quot;Round Rockquot; in 1854. This name was retained when the town relocated along the railroad (1 mi. E) in 1877.