Our Past

The Trinity River was discovered in 1690 by General Alonzo de Leon while searching for an outpost, St. Louis. General de Leon discovered a river at a point near present day Midway, Texas on May 19,1690 and named the river La Santisima de la Trinidad (which means in Spanish 'The Most Holy Trinity'). It was a custom of the time to name prominent landmarks for religious feasts or holy days. The Trinity was discovered two days before the Feast of the Most Holy Trinity. 
 
General de Leon would be surprised to know the river and its basin he discovered in 1690 would, almost 300 years later, contain more than 20% of the State's population of more than 21,000,000 and contain a river basin area larger than nine of the states within the United States.  The Trinity River is 715 miles long and the Trinity River basin is the largest river basin in Texas that begins and ends within the state.  This important tributary provides water to over half of the population of Texas and serves two major population centers: Dallas/Fort Worth in the north and Houston to the south. 

In addition, it is important to recognize that both major population centers drain into the Galveston Bay and estuary system, one of the most productive ecosystems and commercial fisheries in the United States.  It has its beginning in four forks - the East Fork
in Grayson County, the Elm Fork in Montague County, the West Fork in Archer County and the Clear Fork in Parker County. The Clear and Elm Forks join the West Fork in Fort Worth and Dallas respectively. The East Fork joins the Trinity on the border of Ellis and Kaufman Counties just below Dallas County. From there, it flows into Trinity Bay - the northernmost part of Galveston Bay near Anahuac. 
 

The Authority, a political subdivision of the State, was created by an Act of the 54th Legislature in 1955.  We were charged with the following functions:

- Maintaining a Master Plan for Basin-wide development;
- Serving as a local sponsor for federal water projects;
- Providing services authorized by the Texas Legislature within the Authority's       te
rritory.

The organization is governed by a Board of Directors who are appointed by the Governor with the advice and consent of the Senate.


Our Future

Economic regions are often defined in terms of river basins or river valleys because it is a convenient and reasonable method of definition.  This is not only because the river is a basic part of nature’s drainage system but because of the historic requirements for rivers to serve as a source of potable and irrigation water, and as an integral part of a defense system.  In the past the river was the major conduit for transportation and communication. 


R
ivers are a renewable economic resource.  The Trinity River basin lies in eastern Texas and has a total length of 360 miles. The total area drained by the Trinity River and its tributaries is 17,969 square miles, or approximately six percent of the state’s land area.

Dallas and Fort Worth, which were founded on the banks of the Trinity River in the mid-1800’s, totally dominate the upper Trinity River basin. The Dallas/Fort Worth metroplex is the largest inland population center in the United States and has always had a profound impact on water quality.
 

In the early years of the Dallas/Fort Worth metropolitan area's development, it was not uncommon for major tributaries of the Trinity River to run dry.   Today, because of the major lakes in the upper watershed and wastewater plant discharges, the Trinity River flows with more volume every year. In dry weather, it is not at all uncommon for the base flow of the Trinity River to be 95 percent treated wastewater. The Trinity River remains vulnerable and provides very little dilution. Because of these considerations, wastewater treatment plant operators process wastewater to the most advanced treatment standards in the nation. Approximately three and one-half million people are served by eight major regional wastewater treatment plants operated by the Trinity River Authority, Dallas, Fort Worth, Garland and the North Texas Municipal Water District. Wastewater facilities operated by these entities release more than 500 million gallons

per day of treated wastewater that has 98 percent of all conventional contaminants removed. As a result of our combined efforts, the Trinity River is, once again, a river of which we can be proud.  

The wise use of a river is to make the water available to meet the needs of growing populations, use it and then clean the water after it has been polluted by use so that it can be available for other purposes, human and environmental. This is true conservation of resources, and TRA expects to play an even greater role as growth continues at an unparalleled pace.