FOSTER BRANCH. Foster Branch rises three miles east of Moody in southern McLennan County (at 31°19' N, 97°19' W) and runs east for 4½ miles to its mouth on the South Fork of Cow Bayou, two miles north of Bruceville-Eddy (at 31°20' N, 97°16' W). The stream traverses flat to rolling prairie with locally steep slopes, surfaced by expansive clays and clay loams that support juniper, oak, mesquite, and grasses.