The Navarro Mills Lake has the
Trinity River and Richland Creek impounded. The lake has the surface area 5,070 acres. The dam and spillway is approximately 7,570 feet long embankment and it has a maximum height of 81.7 feet. The spillway is maintained by 6 tainter gates that are 40 feet wide and 29 feet tall and the top of the gates have an elevation of 414 feet above mean sea level. The dam has a drainage area of 320 square miles. == Terrestrial ecosystem ==