US Bridges

FM 78 over Martinez Creek

Good

Bexar County, Texas · 4.05 MI NE of IH 410 · Structure no. 150150002509141

Built
1964
61 years old, rebuilt 1995
Condition
Good
inspected June 2024
Type
Stringer/Multi-beam or Girder
Concrete
Length
61 ft
2 main spans
Daily traffic
30,808
2022 count
Owner
State
State Highway Agency

About this bridge

FM 78 over Martinez Creek is a concrete stringer/multi-beam or girder carrying FM 78 over Martinez Creek in Bexar County, Texas. It was built in 1964 and reconstructed in 1995, so it is 61 years old, older than the Texas average of 44.4 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 30,808 vehicles a day, roughly 4% of them trucks, projected to reach 38,818 by 2042. The structure is 61 ft (18.6 m) long and 84 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

CarriesFM 78
CrossesMartinez Creek
Location4.05 MI NE of IH 410
RouteState Highway 78
StateTexas
Coordinates29.48609, -98.34541
Functional classUrban Other Principal Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating63.9 US tons
Inventory rating38 US tons

Structure

MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadH 20
Structure length61 ft (18.6 m)
Longest span30 ft (9.1 m)
Deck width84 ft (25.6 m)
Roadway width68 ft (20.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30,808 (2022)
Projected traffic38,818 by 2042
Trucks4%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusPossibly eligible for the National Register; requires further investigation
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$461,000
NavigationNo navigation control on waterway

Frequently asked questions

When was FM 78 over Martinez Creek built?

It was built in 1964, making it 61 years old in 2025. It was reconstructed in 1995.

What condition is FM 78 over Martinez Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in June 2024.

How much traffic does FM 78 over Martinez Creek carry?

About 30,808 vehicles per day (2022 count), of which roughly 4% are trucks.

How long is FM 78 over Martinez Creek?

The structure is 61 ft (18.6 m) long with a longest span of 30 ft (9.1 m) and a deck 84 ft wide.

Who owns FM 78 over Martinez Creek?

It is owned by the State Highway Agency.