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Trinity River Basin

  • Trinity River Basin

Trinity River Watershed Trivia

  • The Trinity River begins near the Texas-Oklahoma border in Clay, Archer, and Montague counties and from the DFW confluence, flows 512 miles to Galveston Bay, near Houston.
  • There are 1,983 miles of major tributaries that drain to the river.  The West, Clear, Elm and East Forks form the headwaters of the Trinity River.
  • The Trinity River watershed encompasses 18,000 square miles (11.5 Million plus acres), 7% of state’s land area and includes all or parts of 38 Texas counties.
  • Annual precipitation ranges from 36 inches at the headwaters up to 52 inches near its terminus at the Gulf of Mexico.
  • Many human activities affect the Trinity River, including 22 reservoirs on the river that provide drinking water and flood control.  Differing land uses also affect the Trinity River, such as urbanization, commercial/industrial development, row-crop farming, livestock production, timber production and outdoor recreation.
  • Home to terrestrial wildlife and aquatic species, there are various habitats within the Trinity River watershed, including native grasslands, bottomland hardwood forests, and wetlands. The extent of these diverse habitats has been reduced as a result of human activities.


Trinity River Basin Map