US Bridges

FM 78 Mainlanes over Rosillo CR

Good

Bexar County, Texas · 1.8 MI East of IH 410 · Structure no. 150150002509171

Built
1966
59 years old, rebuilt 1994
Condition
Good
inspected June 2024
Type
Culvert
Concrete
Length
54 ft
5 main spans
Daily traffic
26,317
2023 count
Owner
State
State Highway Agency

About this bridge

FM 78 Mainlanes over Rosillo CR is a concrete culvert carrying FM 78 Mainlanes over Rosillo CR in Bexar County, Texas. It was built in 1966 and reconstructed in 1994, so it is 59 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 26,317 vehicles a day, roughly 4% of them trucks, projected to reach 37,541 by 2042. The structure is 54 ft (16.5 m) long. If it were closed, the detour would be 1.2 mi (2 km).

CarriesFM 78 Mainlanes
CrossesRosillo CR
Location1.8 MI East of IH 410
RouteState Highway 78
StateTexas
Coordinates29.47496, -98.37867
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert7 GoodSome minor problems.
Last inspectionJune 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation5: 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 rating44 US tons
Inventory rating26 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans5
Design loadHS 20
Structure length54 ft (16.5 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic26,317 (2023)
Projected traffic37,541 by 2042
Trucks4%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was FM 78 Mainlanes over Rosillo CR built?

It was built in 1966, making it 59 years old in 2025. It was reconstructed in 1994.

What condition is FM 78 Mainlanes over Rosillo CR 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 Mainlanes over Rosillo CR carry?

About 26,317 vehicles per day (2023 count), of which roughly 4% are trucks.

How long is FM 78 Mainlanes over Rosillo CR?

The structure is 54 ft (16.5 m) long with a longest span of 10 ft (3 m).

Who owns FM 78 Mainlanes over Rosillo CR?

It is owned by the State Highway Agency.