Lavaca RiverThe Lavaca River is a navigable river in Texas. It begins in the northeastern part of Gonzales County, and travels generally southeast for until it empties into Lavaca Bay, a component of Matagorda Bay.HistoryThe navigable Texas river's name is a corruption of Rivière des Vaches, by French explorer René-Robert Cavelier, Sieur de La Salle. The flagship of Jean Laffite's fleet was alleged to have been scuttled in the lower part of the river.EconomyHallettsville, and Moulton, Texas, are included in Lavaca-Navidad River Authority, which was established in 1941.