MAYHAW BAYOU. Mayhaw Bayou rises 1½ miles west of Hamshire in western Jefferson County (at 29°52' N, 94°20' W). It flows southeasterly for ten miles to its mouth on the South Fork of Taylor Bayou, five miles south of Fannett (at 29°51' N, 94°15' W). Mayhaw Bayou provides an important source of water for rice farmers in western Jefferson County; numerous pumping stations along the bayou provide the irrigation and drainage necessary for their efforts. The surrounding terrain is marked by the flatlands of the coastal prairie.