JACKSON CREEK (Washington County). Jackson Creek rises two miles west of Brenham in Washington County (at 30°10' N, 96°26' W) and runs south for six miles to its mouth on the East Fork of Mill Creek, four miles southwest of Brenham (at 30°05' N, 96°26' W). It traverses level to moderately sloping terrain, surfaced by fine sandy loams that support grasses and post oaks.