Local History
Texas Dam and Reservoir Historical Markers: Water Projects That Transformed the State
From a Spanish mission aqueduct finished in 1745 to Depression-era dams that paid Texans 40 cents an hour, six historical markers trace how engineered water reshaped Texas.
Photo: John Gibbons / Unsplash. Glen Canyon Dam.
Texas has more than 16,000 official historical markers. A lot of them stand next to water that wasn't there until somebody decided to put it there. RoadHistorical is a Texas historical preservation platform that tells you when your drive takes you past one of those markers. This article covers six of them. The oldest is a mission aqueduct finished in 1745. The newest put 1,800 people to work at 40 cents an hour during the Depression.
In 1913 the whole state had eight major reservoirs. By 1970 it had 149. Almost all of that water arrived because somebody dammed a river, and almost every one of those projects has a marker sitting near it.
The Spanish Waterworks Still Carrying Water After 280 Years
Mission San Francisco de la Espada Dam, Ditch and Aqueduct is the oldest thing on this list by two centuries. Franciscan missionaries knew the mission would die without reliable water. So they built three things. A 270-foot dam across the San Antonio River. An irrigation ditch. An aqueduct to carry that ditch over Piedras Creek.
The dam curves the wrong way. It bows downstream instead of upstream, which every engineering instinct says shouldn't hold. It has held since the 1740s. The river's lime salts slowly cemented the gravel, rock, and brush the missionaries piled up, and the structure got stronger with age instead of weaker. Local tradition says goat's milk went into the mortar of the aqueduct, built between 1740 and 1745. It's the only Spanish colonial aqueduct of its kind left in the United States.
The irrigated valley grew maize, beans, melons, calabashes, sweet potatoes, and cotton. When Spain secularized the mission in 1794, only fifteen sick or elderly Native residents remained. The ditch sat unused for about fifteen years before the Espada Ditch Company repaired the dam in 1895. The San Antonio Conservation Society bought the property in 1941 to keep it from disappearing. The Department of the Interior made the aqueduct a National Historic Landmark in 1965.
Marker location: 10040 Espada Rd, San Antonio, TX
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The Dam That Sent Its Engineer Onto the Lusitania
Medina Dam topped every other dam in Texas the day crews finished it in 1912. It ranked fourth in the country.
Henri Castro pictured irrigated farms along the Medina River back in the 1840s, when he was colonizing the area. Nothing happened for sixty years. Then Dr. Fred Stark Pearson, an engineer with an international reputation, talked British investors into funding a dam at this site. Crews hauled limestone boulders from a nearby quarry to bulk up the concrete. Four miles downstream a smaller diversion dam pushed water into canals, and gravity carried it the rest of the way to the fields.
Then World War I broke out in 1914 and cut Pearson off from his British money. He and his wife sailed for England in 1915 to find new investors. Their ship was the Lusitania. A German submarine torpedoed it and both of them died.
The irrigation system outlived him. Vegetables from those fields turned into a real crop, and rural families in the area got water and electricity out of the deal. Voters set up the Bexar-Medina-Atascosa Counties Water Improvement District No. 1 in 1925 to run it.
Marker location: Medina Dam Rd, Mico, TX
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Two Depression Dams and the Towns They Drowned
Buchanan Dam exists because a company went broke and a state senator refused to let the hole in the ground stay empty.
The Central Texas Hydro-Electric Company started a dam on the Colorado River at the Burnet and Llano county line in 1931. By April 1932 the company was bankrupt and the dam sat half built. State Senator Alvin Wirtz picked it up, couldn't find private money, and went to Washington instead. He won over U.S. Representative J.P. Buchanan, who chaired the House Appropriations Committee, by promising to put Buchanan's name on the dam. In 1934 the Texas Legislature passed House Bill No. 1 creating the Lower Colorado River Authority, with the power to control, store, preserve, use, distribute, and sell the water of the Colorado.
For Burnet County the dam meant work. Locals lined up for 1,800 jobs, mostly construction, mostly at 40 cents an hour. That money kept families fed and propped up farm income through the worst of the Depression. The LCRA held its completion ceremony in October 1937.
Filling Lake Buchanan behind it pushed people out. Long-time residents packed up and moved uphill. About sixty graves came out of Old Bluffton Cemetery and went back into the ground at New Bluffton in Llano County. The lake brought fishing camps, vacation rentals, and new residents to replace the ones it displaced.
Marker location: Buchanan Dam, SH 29, Burnet County, TX
Morris Sheppard Dam and Possum Kingdom Lake came out of the Brazos River flooding and killing people one time too many.
The Works Progress Administration put up $4.5 million of the $8.5 million cost, and the job took three years. The dam carries U.S. Senator Morris Sheppard's name and opened in 1941. It runs 2,740 feet long and stands 190 feet high, with nine spillway gates to pass floodwater and drift. Two 11,250-kilowatt generators still feed power into the surrounding area.
Impounding the Brazos put bridges, roads, and an entire town under water. The area came back slowly, then all at once after World War II, when fishing lodges and campgrounds turned Possum Kingdom into a destination. Flood control and water supply were the point. Recreation was the bonus nobody planned for.
Marker location: Morris Sheppard Dam, Graford, TX
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One Lake for a City, One Lake for 140,000 Acres of Farmland
White Rock Dam, Reservoir and Park shows what happens when a city outgrows its springs.
Early Dallas drank from natural springs, artesian wells, and the Trinity River. By the early 1900s none of it was enough. Under Mayor Stephen J. Hay the city started buying 2,292 acres along White Rock Creek in 1909. The Fred A. Jones Co. broke ground in January 1910 and finished the dam and pump house in 1911. Then drought held the lake empty until April 1914.
The lake turned into a park almost by accident. The city allowed fishing starting in 1917. Sailing and boating took over within ten years. The land around it became a city park in 1929. The firm of Carsey and Linskie designed an Art Deco bathhouse and boathouse the following year. A city prison farm operated at the lake until 1935. A Civilian Conservation Corps camp, Company 2896, ran from 1935 to 1942 and built much of what visitors still use, with the WPA adding more. In the 1930s and 1940s over half a million people came each summer.
The war changed it again. The old CCC camp became a U.S. Army Air Corps center and then a camp for German prisoners of war. Drought in 1953 forced the city to ban swimming and pull drinking water back out of the lake. An ordinance banning big outboard motors in 1958 sent the speedboat crowd elsewhere, and attendance fell for years before preservation efforts brought it back.
Marker location: White Rock Lake, Dallas, TX
Red Bluff Dam did the same job for farmland instead of a city.
Crews built it on the Pecos River between 1934 and 1936, eight miles south of the New Mexico line, for irrigation and electricity. The main embankment runs 9,230 feet long, rises 105 feet above the streambed, and measures 25 feet across the top. Floods filled the reservoir for the first time in June 1937. It holds 310,000 acre-feet across parts of Reeves and Loving counties in Texas and Eddy County in New Mexico.
That water irrigates roughly 140,000 acres strung out along 100 miles of the Pecos. In that part of West Texas, the difference between farmland and scrub is this dam.
Marker location: Red Bluff Dam, US 285 north of Orla, TX
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How RoadHistorical Finds These Markers
Dam markers sit in awkward places. They're at the end of a county road, on a levee, in a park you'd only find on purpose. Discovery Mode solves that by watching your location as you drive and telling you when a marker is coming up. You don't have to know it's there ahead of time.
The AI Tour Guide handles the questions the plaque leaves alone. Plaques run a few hundred words and stop. Ask why the LCRA got created. Ask what happened to the town under Possum Kingdom Lake. You get the answer standing at the marker instead of hours later. Offline mode matters more here than most places, because Reeves County and Palo Pinto County have long stretches with no signal. Download the area first and everything still works.
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RoadHistorical is free to download on iPhone and Android. Download it here and turn on Discovery Mode before your next drive. Android users can download RoadHistorical from Google Play.
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