US Bridges

FM 604 over Little Rocky Creek Trib

Good

Callahan County, Texas · 5.4 MI S of SH 36 · Structure no. 080300097402007

Built
1955
70 years old
Condition
Good
inspected February 2023
Type
Culvert
Concrete
Length
40 ft
4 main spans
Daily traffic
164
2020 count
Owner
State
State Highway Agency

About this bridge

FM 604 over Little Rocky Creek Trib is a concrete culvert carrying FM 604 over Little Rocky Creek Trib in Callahan County, Texas. It was built in 1955, so it is 70 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 164 vehicles a day, roughly 19% of them trucks, projected to reach 180 by 2033. The structure is 40 ft (12.2 m) long and 27 ft wide. If it were closed, the detour would be 14.3 mi (23 km).

Location

Open in Google Maps
CarriesFM 604
CrossesLittle Rocky Creek Trib
Location5.4 MI S of SH 36
RouteState Highway 604
CountyCallahan County
StateTexas
Coordinates32.18657, -99.55816
Functional classRural Major Collector

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 protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment3: Basically intolerable, requiring high priority of corrective action
Operating rating36 US tons
Inventory rating27 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans4
Design loadUnknown
Structure length40 ft (12.2 m)
Longest span8 ft (2.4 m)
Deck width27 ft (8.3 m)
Roadway width26 ft (7.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic164 (2020)
Projected traffic180 by 2033
Trucks19%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.3 mi (23 km)
TollOn a free road
National Highway SystemNo

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 604 over Little Rocky Creek Trib built?

It was built in 1955, making it 70 years old in 2025.

What condition is FM 604 over Little Rocky Creek Trib 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 February 2023.

How much traffic does FM 604 over Little Rocky Creek Trib carry?

About 164 vehicles per day (2020 count), of which roughly 19% are trucks.

How long is FM 604 over Little Rocky Creek Trib?

The structure is 40 ft (12.2 m) long with a longest span of 8 ft (2.4 m) and a deck 27 ft wide.

Who owns FM 604 over Little Rocky Creek Trib?

It is owned by the State Highway Agency.