DOAK BRANCH. Doak Branch rises a mile southeast of Charlotte in west central Atascosa County (at 28°50' N, 98°41' W) and runs south for seven miles to its mouth on Lagunillas Creek, six miles south of Charlotte (at 28°45' N, 98°42' W). In its upper reaches the creek crosses low-rolling to flat terrain surfaced by sandy and clay loams that support scrub brush, cacti, and grasses. Near the creek's mouth water-tolerant hardwoods and conifers grow in flat terrain with local shallow depressions. Some nearby land is irrigated for crops. Doak Branch was named for early settler Jonathon A. Doak, who moved to the area in 1856. The creek traversed his land.
Margaret G. Clover, The Place Names of Atascosa County (M.A. thesis, University of Texas, 1952).