State Highway 3-A Bridge at Cibolo Creek
Also known as: I-10 Bridge at Cibolo Creek
Why it's listed
This 434-foot bridge carries the eastbound frontage road of Interstate 10 over Cibolo Creek, the boundary between Bexar and Guadalupe counties near Schertz. It has a single 120-foot riveted Parker through truss span and six 52-foot steel I-beam approach spans, the outer beams encased in concrete, probably for appearance. The D.F. Jones Construction Company of Little Rock built it in 1932 and 1933 for the Texas Highway Department on the new State Highway 3-A route between San Antonio and Seguin. Houston Structural Steel fabricated the steel. The truss follows the department's T24-120 standard design, and this bridge is the only survivor of that design's first version. In the early 1960s two new I-beam bridges were built alongside to carry the main traffic lanes, which left the older bridge in service with few alterations. It retains substantial integrity and is recognized for its engineering significance at the state level.
Significance in brief: The bridge embodies the defining characteristics of a Texas Highway Department truss bridge and is significant in engineering at the state level. Its T24-120 truss design is the only surviving example of the first version of that design. The bridge also retains substantial integrity of design, materials and workmanship.
Machine-generated summary. This summary was generated by a language model from the official nomination document and has not been reviewed line by line by an editor. It may contain errors. Check the source document before relying on any detail. Source: nomination document (PDF) · National Archives catalog entry. NRHP reference 96001112, listed October 10, 1996. Summary generated October 2026 (model claude-sonnet-5-5, prompt v1.0-2026-10-29, confidence high).
Key facts
| Address | I-10 at the Bexar and Guadalupe Cnty. line, Schertz |
|---|---|
| County | Bexar County |
| Listed | October 10, 1996 |
| Reference number | 96001112 |
| Resource type | Structure |
| Period of significance | 1932-1933 |
| Architect / builder | Bridge Designer: Texas Highway Department; Truss Fabricator: Houston Structural Steel Company, owned and operated by the Mosher Steel & Machinery Company of Dallas, Texas; Bridge Builder: D.F. Jones Construction Company of Little Rock, Arkansas |
| Architectural style | Other: Parker through truss bridge |
| Criteria |
|
| Areas of significance | Engineering |
| Level of significance | State |
| Status (as stated in the nomination) | Remains in place serving vehicular traffic as the eastbound I-10 frontage road; no projects currently planned. |
| Acreage | 0.9 |
| Coordinates | 29.50139, -98.18671 (NPS GIS) |
What listing means for this property
For a publicly owned building or structure, listing mainly matters when federal funds, permits or licences are involved: projects then go through Section 106 review so effects on the property are considered. Listing also strengthens applications for preservation grants and, for leased income-producing uses, can enable the federal rehabilitation tax credit.
General information, not legal or tax advice. Rules change; confirm with your State Historic Preservation Office or a qualified adviser.
Sources and further reading
- National Park Service, National Register of Historic Places database (snapshot May 2026), reference 96001112.
- Nomination form (PDF, National Archives) — catalog entry
- Wikipedia article (used for cross-checking only; text not reproduced here)
- Wikidata Q7603284
- This listing as JSON
Last updated October 2026. Found an error? See the editorial policy for how to report it.