Dodd's Creek Bridge
Salado, Bell County, Texas
Marker Inscription
(Lenticular Truss Bridge) One of many patented truss designs developed by American inventors and engineers in the mid- to late-19th century, this 87-foot lenticular truss bridge represents an unusual truss type in the United States. The lenticular design features a curved top and bottom chord which forms a lens shape. The patent, issued to William O. Douglas of Connecticut in 1878, was the only one given for a lenticular truss bridge in the United States. Most were constructed in the New England area and in New York state. Through the efforts of William Payson, a salesman for Douglas' Berlin Iron Bridge Company, Texas acquired at least a dozen truss bridges in the late 19th century. The Coryell County Commissioners Court contracted with the Berlin Iron Bridge Company to build four lenticular truss bridges for $16,500 in 1889. This bridge originally was located across Cowhouse Creek and later was moved to Dodd's Creek. In 1990 the Texas Historical Commission and the Texas Department of Transportation identified eight lenticular truss bridges surviving in Texas. Four of the spans were located in San Antonio; the other four were positioned on out-of-service roadways. The only examples of this rare bridge type west of the Mississippi, they are recognized as historically significant engineering structures. The Society for Industrial Archeology and Historic American Engineering Record, a branch of the National Park Service, also have recognized the importance of the Texas lenticular bridges as products of a short-lived but important period of bridge technology in 19th century engineering history. The Dodd's Creek bridge was moved to this site in 1997 to improve the flow of traffic, protect pedestrians and enhance the Salado Historic District. (2000)
Erected by Texas Historical Commission
The Story
This 87-foot lenticular truss bridge, its curved top and bottom chords forming a lens shape, embodies a rare American bridge type patented by Connecticut's William O. Douglas in 1878. Through salesman William Payson, the Berlin Iron Bridge Company sold at least a dozen such spans to Texas, and this one—first built over Cowhouse Creek—was among four the Coryell County court ordered in 1889. Recognized as one of the few lenticular bridges west of the Mississippi, it was relocated to Dodd's Creek in 1997 to ease traffic and enhance the Salado Historic District.
Why it matters
The bridge is a rare survivor from a brief but pivotal chapter in nineteenth-century American engineering, when patented iron trusses reshaped how the country crossed its rivers.
The story behind this marker
AI contextThe era
The decades after the Civil War were America's great age of iron. Railroads pushed into every corner of the country, towns competed to be reachable, and the humble river crossing became a matter of commerce and pride. A community with a reliable bridge could move cotton, cattle, and people; one without had to ford, ferry, or wait.
Into this hunger stepped a generation of inventor-engineers who treated bridge-building as a field for patents and competition. Iron was replacing timber, standardized parts were replacing one-off carpentry, and a company could ship a bridge in pieces by rail and bolt it together far from the foundry.
Central Texas in the late nineteenth century was exactly this kind of market. Growing counties needed durable crossings over creeks that could run dry for months and then flood in a single afternoon, and they were willing to contract with distant firms to get engineering they could not build locally.
People & events
The story here begins far from Texas, with a Connecticut inventor named William O. Douglas, who in 1878 patented a distinctive bridge design whose top and bottom chords both curve outward to form the shape of a lens. It was the only patent of its kind granted in the United States, and most bridges built to it rose in New England and New York, close to the foundry that produced them.
Getting one of these curved iron spans to Texas took a salesman. William Payson, working for Douglas's Berlin Iron Bridge Company, carried the design south and made the sale, and through his efforts Texas acquired at least a dozen of these unusual trusses in the closing decades of the century.
This particular bridge was one of four the Coryell County commissioners ordered from the company in a single 1889 contract. It first carried traffic over Cowhouse Creek, was later moved to Dodd's Creek, and in 1997 was relocated once more to its present spot to smooth the flow of traffic, protect people on foot, and grace the Salado Historic District.
Its place in the American story
The lenticular truss belongs to a brief, intense chapter of American engineering, when patented iron designs competed for a country's business before the technology moved on. Its lens shape was never common, and surviving examples are rare enough that engineers and historians treat each one as a document.
That rarity is sharpest west of the Mississippi, where these spans are the only examples of their type. Their importance has been recognized well beyond the county that bought them, by preservation and industrial-archaeology bodies and by the federal record that documents historic American engineering.
So a small crossing in Central Texas carries a national story in its curved iron: the moment when American bridges stopped being built board by board on the riverbank and started being ordered, shipped, and assembled from a catalog of patented ideas.
If you visit
Stand back from one end first and let your eye follow the top and bottom chords. Both of them bow — the whole truss swells toward its middle and tapers at the ends into that unmistakable lens. Once you see it, you cannot unsee it, and you understand why engineers single this design out.
Look closely at the ironwork itself: the riveted and bolted members are the fingerprints of a bridge that was manufactured elsewhere and assembled on site, not framed by a local carpenter. This is a machine-age object, shipped in pieces and put together like a kit.
It fits neatly into a day spent in the Salado Historic District, where the bridge now serves foot traffic. Think of it as a survivor that has crossed more than water — it has crossed two creeks and more than a century, and it is one of only a handful of its kind left on this side of the country.
Written by AI to add context, grounded in the marker’s inscription and the historical record. The inscription above is the original, unaltered text.
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Related people
- · William O. Douglas
- · William Payson
Themes & tags
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