US Bridges

FM512 over Martin Crk

Fair

Hunt County, Texas · 10.5 MI S JCT SH34&FM512 · Structure no. 011170057902002

Built
1948
77 years old
Condition
Fair
inspected October 2024
Type
Slab
Concrete
Length
45 ft
3 main spans
Daily traffic
370
2020 count
Owner
State
State Highway Agency

About this bridge

FM512 over Martin Crk is a concrete slab carrying FM512 over Martin Crk in Hunt County, Texas. It was built in 1948, so it is 77 years old, older than the Texas average of 44.4 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 6 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

It carries about 370 vehicles a day, roughly 11% of them trucks, projected to reach 457 by 2039. The structure is 45 ft (13.7 m) long and 25 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesFM512
CrossesMartin Crk
Location10.5 MI S JCT SH34&FM512
RouteState Highway 512
CountyHunt County
StateTexas
Coordinates33.25731, -96.00082
Functional classRural Major Collector

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourScour evaluation has not been made
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 alignment7: Better than present minimum criteria
Operating rating54 US tons
Inventory rating25 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadH 15
Structure length45 ft (13.7 m)
Longest span15 ft (4.6 m)
Deck width25 ft (7.7 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic370 (2020)
Projected traffic457 by 2039
Trucks11%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 FM512 over Martin Crk built?

It was built in 1948, making it 77 years old in 2025.

What condition is FM512 over Martin Crk in?

The National Bridge Inventory rates it in fair condition. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. The last reported inspection was in October 2024.

How much traffic does FM512 over Martin Crk carry?

About 370 vehicles per day (2020 count), of which roughly 11% are trucks.

How long is FM512 over Martin Crk?

The structure is 45 ft (13.7 m) long with a longest span of 15 ft (4.6 m) and a deck 25 ft wide.

Who owns FM512 over Martin Crk?

It is owned by the State Highway Agency.