The Trinity River is a river, the longest with a watershed entirely within the

U.S. state In the United States, a state is a constituent political entity, of which there are 50. Bound together in a political union, each state holds governmental jurisdiction over a separate and defined geographic territory where it shares its so ...

Texas Texas ( , ; or ) is the most populous U.S. state, state in the South Central United States, South Central region of the United States. It borders Louisiana to the east, Arkansas to the northeast, Oklahoma to the north, New Mexico to the we ...

. It rises in extreme northern Texas, a few miles south of the Red River. The

headwaters The headwater of a river or stream is the geographical point of its beginning, specifically where surface runoff water begins to accumulate into a flowing channel of water. A river or stream into which one or many tributary rivers or streams flo ...

are separated by the high bluffs on the southern side of the Red River. The Trinity River was previously identified as the stream that the

Caddo The Caddo people comprise the Caddo Nation of Oklahoma, a federally recognized tribe headquartered in Binger, Oklahoma. They speak the Caddo language. The Caddo Confederacy was a network of Indigenous peoples of the Southeastern Woodlands, who ...

called Arkikosa in Central Texas and Daycoa nearer the coast. However, in 2022, language preservationists from the Caddo Nation determined their ancestral language lacked the letter “R” sound. Arkikosa was likely a corruption or misspelling of the word Akokisa. In the vernacular of another tribe, the

Atakapa The Atakapa Sturtevant, 659 or Atacapa were an Indigenous people of the Southeastern Woodlands, who spoke the Atakapa language and historically lived along the Gulf of Mexico in what is now Texas and Louisiana. They included several distinct b ...

who settled in the Gulf Coast woodlands, Akokisa means “river people.” French explorer Robert Cavelier de La Salle, in 1687, named the river, ''Riviere des canoës'' ("River of Canoes"). In 1690 Spanish explorer Alonso de León named it, ''"La Santísima Trinidad"'' ("the Most Holy Trinity").

Course

Margaret Hunt Hill Bridge at Trinity River

The Trinity River has four branches: the West Fork, the Clear Fork, the Elm Fork, and the East Fork. The West Fork Trinity River has its headwaters in Archer County. From there it flows southeast, through the man-made reservoirs Lake Bridgeport and Eagle Mountain Lake, and eastward through Lake Worth and the city of

Fort Worth Fort Worth is a city in the U.S. state of Texas and the county seat of Tarrant County, Texas, Tarrant County, covering nearly into Denton County, Texas, Denton, Johnson County, Texas, Johnson, Parker County, Texas, Parker, and Wise County, Te ...

. The Clear Fork Trinity River begins north of

Weatherford, Texas Weatherford () is a city in and the county seat of Parker County, Texas, United States. In 2020, its population was 30,854. Weatherford is named after Thomas J. Weatherford, a State senator and advocate for Texas's secession to the Confederate ...

, and flows southeastward through Lake Weatherford and Benbrook Lake reservoirs. It flows northeastward, where it joins the West Fork near downtown Fort Worth and continues as the West Fork. The Elm Fork Trinity River flows south from near Gainesville through Ray Roberts Lake and east of the city of Denton, eventually through

Lewisville Lake Lewisville Lake, formerly known as Garza-Little Elm Reservoir, is a reservoir in North Texas (United States, USA) on the Elm Fork of the Trinity River (Texas), Trinity River in Denton County, Texas, Denton County near Lewisville, Texas, Lewisvil ...

. The West Fork and the Elm Fork merge as they enter the city of

Dallas Dallas () is a city in the U.S. state of Texas and the most populous city in the Dallas–Fort Worth metroplex, the List of Texas metropolitan areas, most populous metropolitan area in Texas and the Metropolitan statistical area, fourth-most ...

. The East Fork Trinity River (on old maps the Bois d'Arc River) begins near

McKinney, Texas McKinney is a city in and the county seat of Collin County, Texas, United States. It is Collin County's third-largest city, after Plano, Texas, Plano and Frisco, Texas, Frisco. A suburb of the Dallas–Fort Worth metroplex, McKinney is about ...

, and flows through Lavon Lake and then Lake Ray Hubbard before joining the Trinity River just southeast of Dallas. The Trinity flows southeast from Dallas across a fertile floodplain and the pine forests of eastern Texas. The Trinity crosses Texas State Highway 31 in Henderson County, near where the first county seat, Buffalo, was established. Roughly north of the mouth on Galveston Bay, an earthen

dam A dam is a barrier that stops or restricts the flow of surface water or underground streams. Reservoirs created by dams not only suppress floods but also provide water for activities such as irrigation, human consumption, industrial use, aqua ...

was built in 1968 to form Lake Livingston. The river empties into Trinity Bay, an arm of Galveston Bay that is an inlet of the

Gulf of Mexico The Gulf of Mexico () is an oceanic basin and a marginal sea of the Atlantic Ocean, mostly surrounded by the North American continent. It is bounded on the northeast, north, and northwest by the Gulf Coast of the United States; on the southw ...

. Its

river mouth A river mouth is where a river flows into a larger body of water, such as another river, a lake/reservoir, a bay/gulf, a sea, or an ocean. At the river mouth, sediments are often deposited due to the slowing of the current, reducing the carryin ...

is near the town of Anahuac, southeast of

Houston Houston ( ) is the List of cities in Texas by population, most populous city in the U.S. state of Texas and in the Southern United States. Located in Southeast Texas near Galveston Bay and the Gulf of Mexico, it is the county seat, seat of ...

Tributaries

*Clear Fork of the Trinity River *East Fork of the Trinity River (Bois d'Arc River) *Elm Fork of the Trinity River * West Fork of the Trinity River * Bachman Branch * Cedar Creek * Clear Creek (confluence with Elm Fork in Denton) * Mountain Creek * Fossil Creek (Texas) * Johnson Creek * Red Oak Creek * Richland Creek * White Rock Creek * Rowlett Creek *Big Creek *Fourmile Creek *Five Mile Creek *Ten Mile Creek * Sycamore Creek * Marine Creek

Public works projects

Plans from the 1890s for a shipping channel along the length of the Trinity River were scrapped because it would have required extensive dredging to make the river navigable, although several overpasses were built with very high clearances in anticipation of the shipping channel. Locks were actually built 13 miles downstream of Dallas in the early 1900s. Original federal plans called for building 36 locks and dams from Trinity Bay near Houston to Dallas. The first built was Lock and Dam No. 1 in the city of Dallas at McCommas Bluff, directly west of Lincoln Memorial Cemetery. Lock construction came to a standstill in the wake of World War I, however. Only Lock and Dam Nos. 1, 2, 4, 6, 7, 20 and 25 were built. There are currently no plans for addressing these old locks located in various spots along the Trinity River. However, the Corps is working nearby on the Dallas Floodway Extension Project. The DFE Project is under construction and is helping to fulfill their mission, as directed by Congress in cooperation with the city of Dallas. It is helping to lower flood risk, and provide ecosystem restoration and recreation to the citizens of Dallas. The Trinity River Corridor Project is intended to transform the Trinity River flood zone in

downtown Dallas Downtown Dallas is the central business district (CBD) of Dallas, Texas, United States, located in the geographic center of the city. It is the second-largest business district in the state of Texas. The area termed "Downtown" has traditionally ...

into the nation's largest urban park, featuring three signature bridges designed by acclaimed architect

Santiago Calatrava Santiago Calatrava Valls (born 28 July 1951) is a Spaniards, Spanish-Swiss people, Swiss architect, structural engineer, sculptor and painter, particularly known for his bridges supported by single leaning pylons, and his railway stations, stad ...

. A similar project is planned by the Tarrant Regional Water District, City of Fort Worth, Tarrant County, Streams & Valleys Inc., and U.S. Army Corps of Engineers to develop an area north of "downtown" as "uptown" along the Trinity River. This plan promotes a large

mixed-use development Mixed use is a type of urban development, urban design, urban planning and/or a zoning classification that blends multiple uses, such as residential, commercial, cultural, institutional, or entertainment, into one space, where those functions ...

adjacent to the central city area of Fort Worth, with a goal to prevent

urban sprawl Urban sprawl (also known as suburban sprawl or urban encroachment) is defined as "the spreading of urban developments (such as houses and shopping centers) on undeveloped land near a city". Urban sprawl has been described as the unrestricted ...

by promoting the growth of a healthy, vibrant urban core. The Trinity River Vision lays the groundwork to enable

's central business district to double in size over the next forty years.

Floods and flood protection

Major flooding occurred on the Trinity River in the years 1844, 1866, 1871, and 1890, but a major event in the spring of 1908 set in motion the harnessing of the river. On 26 May 1908, the Trinity River reached a depth of and a width of . Five people died, 4,000 were left homeless, and property damage was estimated at $2.5 million. Dallas was without power for three days, all

telephone A telephone, colloquially referred to as a phone, is a telecommunications device that enables two or more users to conduct a conversation when they are too far apart to be easily heard directly. A telephone converts sound, typically and most ...

and

telegraph Telegraphy is the long-distance transmission of messages where the sender uses symbolic codes, known to the recipient, rather than a physical exchange of an object bearing the message. Thus flag semaphore is a method of telegraphy, whereas ...

service was down, and rail service was canceled. The only way to reach

Oak Cliff Oak Cliff is an area of Dallas, Texas, United States that was formerly a separate town in Dallas County; established in 1887 and annexed by Dallas in 1903, Oak Cliff has retained a distinct neighborhood identity as one of Dallas' older establ ...

was by boat.Dallas Historical Society

. Retrieved 20 April 2006. West Dallas was hit harder than any other part of the city—the '' Dallas Times Herald'' said "indescribable suffering" plagued the area. Much to the horror of residents, thousands of livestock drowned in the flood and some became lodged in the tops of trees. The stench of their decay hung over the city as the water subsided. After the disastrous flood, the city's citizenry wanted to find a way to control the unpredictable Trinity River and to build a bridge linking Oak Cliff and Dallas. The immediate reaction was clamor to build an indestructible, all-weather crossing over the Trinity. This had already been tried following the 1890 flood; the result was the "Long Wooden Bridge" that connected Jefferson Boulevard in Oak Cliff and Cadiz in Dallas, but the resulting unstable bridge was easily washed away by the 1908 flood. George B. Dealey, publisher of the ''

Dallas Morning News ''The Dallas Morning News'' is a daily newspaper serving the Dallas–Fort Worth area of Texas, with an average print circulation in 2022 of 65,369. It was founded on October 1, 1885, by Alfred Horatio Belo as a satellite publication of the ' ...

'', proposed a

concrete Concrete is a composite material composed of aggregate bound together with a fluid cement that cures to a solid over time. It is the second-most-used substance (after water), the most–widely used building material, and the most-manufactur ...

bridge based on the design of a bridge crossing the

Missouri River The Missouri River is a river in the Central United States, Central and Mountain states, Mountain West regions of the United States. The nation's longest, it rises in the eastern Centennial Mountains of the Bitterroot Range of the Rocky Moun ...

Kansas City The Kansas City metropolitan area is a bi-state metropolitan area anchored by Kansas City, Missouri. Its 14 counties straddle the border between the U.S. states of Missouri (9 counties) and Kansas (5 counties). With and a population of more t ...

. Ultimately, a

US$ The United States dollar (Currency symbol, symbol: Dollar sign, $; ISO 4217, currency code: USD) is the official currency of the United States and International use of the U.S. dollar, several other countries. The Coinage Act of 1792 introdu ...

650,000 (US$ in today's terms) bond election was approved and in 1912, the Oak Cliff Viaduct (now the Houston Street Viaduct) was opened with festivities that drew 58,000 spectators. At that time, the bridge was the longest concrete structure in the world. Following from the 1908 flooding, levees were first constructed in 1932. They were heightened in 1960 to the 30 ft that has been maintained to the early 21st century. Current plans to improve the existing levees are part of what is known as the Dallas Floodway Extension project and the Trinity River Project. They entail extending two existing levees and raising two others, all adjacent to the downtown Dallas area. Downtown Dallas also suffered severe flooding in 1990. Minor flooding of the Trinity River occurs frequently, such as, for instance, in the spring of 2015 and summer of 2022.

References