The San Gabriel has two other tributaries — the Russell and Middle forks. The Russell Fork begins six miles north of Burnet and then flows into the North Fork. The Middle Fork forms five miles east of Liberty Hill in Williamson County and then flows east to its confluence with the North Fork about one mile west of I-35 near the western city limits of Georgetown. Other seasonal tributaries of the San Gabriel include Brushy, Alligator, Opossum, Berry, Pean, Little and Oatmeal creeks.