US Bridges

SH 29 over Twelvemile Creek

Fair

Mason County, Texas · 2.85 MI E of RM 1900 · Structure no. 141570015001036

Built
1946
79 years old
Condition
Fair
inspected May 2023
Type
Slab
Concrete Continuous
Length
150 ft
6 main spans
Daily traffic
1,553
2020 count
Owner
State
State Highway Agency

About this bridge

SH 29 over Twelvemile Creek is a concrete continuous slab carrying SH 29 over Twelvemile Creek in Mason County, Texas. It was built in 1946, so it is 79 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 1,553 vehicles a day, roughly 17% of them trucks, projected to reach 1,500 by 2033. The structure is 150 ft (45.7 m) long and 29 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesSH 29
CrossesTwelvemile Creek
Location2.85 MI E of RM 1900
RouteState Highway 29
CountyMason County
StateTexas
Coordinates30.73891, -99.0293
Functional classRural Minor Arterial

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.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
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 rating50 US tons
Inventory rating30 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans6
Design loadH 20
Structure length150 ft (45.7 m)
Longest span25 ft (7.6 m)
Deck width29 ft (8.9 m)
Roadway width25 ft (7.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,553 (2020)
Projected traffic1,500 by 2033
Trucks17%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 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 SH 29 over Twelvemile Creek built?

It was built in 1946, making it 79 years old in 2025.

What condition is SH 29 over Twelvemile Creek 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 May 2023.

How much traffic does SH 29 over Twelvemile Creek carry?

About 1,553 vehicles per day (2020 count), of which roughly 17% are trucks.

How long is SH 29 over Twelvemile Creek?

The structure is 150 ft (45.7 m) long with a longest span of 25 ft (7.6 m) and a deck 29 ft wide.

Who owns SH 29 over Twelvemile Creek?

It is owned by the State Highway Agency.