US Bridges

FM 631 over Drainage Ditch

Fair

San Patricio County, Texas · 1.00 MI N of US 181 · Structure no. 162050120902003

Built
1953
72 years old
Condition
Fair
inspected April 2024
Type
Slab
Concrete
Length
50 ft
2 main spans
Daily traffic
990
2022 count
Owner
State
State Highway Agency

About this bridge

FM 631 over Drainage Ditch is a concrete slab carrying FM 631 over Drainage Ditch in San Patricio County, Texas. It was built in 1953, so it is 72 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 990 vehicles a day, roughly 14% of them trucks, projected to reach 1,670 by 2033. The structure is 50 ft (15.2 m) long and 25 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesFM 631
CrossesDrainage Ditch
Location1.00 MI N of US 181
RouteState Highway 631
CountySan Patricio County
StateTexas
Coordinates27.98448, -97.37547
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56 US tons
Inventory rating26 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadH 15
Structure length50 ft (15.2 m)
Longest span25 ft (7.6 m)
Deck width25 ft (7.7 m)
Roadway width23 ft (7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic990 (2022)
Projected traffic1,670 by 2033
Trucks14%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost$3,000
NavigationNo navigation control on waterway

Frequently asked questions

When was FM 631 over Drainage Ditch built?

It was built in 1953, making it 72 years old in 2025.

What condition is FM 631 over Drainage Ditch 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 April 2024.

How much traffic does FM 631 over Drainage Ditch carry?

About 990 vehicles per day (2022 count), of which roughly 14% are trucks.

How long is FM 631 over Drainage Ditch?

The structure is 50 ft (15.2 m) long with a longest span of 25 ft (7.6 m) and a deck 25 ft wide.

Who owns FM 631 over Drainage Ditch?

It is owned by the State Highway Agency.