US Bridges

SH 105 over Trinity River

Fair

Liberty County, Texas · 4.0 MI NW of SH 146 · Structure no. 201460095101004

Built
1967
58 years old
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
1,350 ft
3 main spans
Daily traffic
4,651
2020 count
Owner
State
State Highway Agency

About this bridge

SH 105 over Trinity River is a steel continuous stringer/multi-beam or girder carrying SH 105 over Trinity River in Liberty County, Texas. It was built in 1967, so it is 58 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 5 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 4,651 vehicles a day, roughly 21% of them trucks, projected to reach 7,120 by 2033. The structure is 1,350 ft (411.5 m) long and 37 ft wide. If it were closed, the detour would be 32.9 mi (53 km).

Location

Open in Google Maps
CarriesSH 105
CrossesTrinity River
Location4.0 MI NW of SH 146
RouteState Highway 105
CountyLiberty County
StateTexas
Coordinates30.27748, -94.79778
Functional classRural Principal Arterial - Other

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.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionApril 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: 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 rating61.9 US tons
Inventory rating37 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3 (+24 approach)
Design loadH 20
Structure length1,350 ft (411.5 m)
Longest span150 ft (45.7 m)
Deck width37 ft (11.4 m)
Roadway width35 ft (10.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,651 (2020)
Projected traffic7,120 by 2033
Trucks21%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed32.9 mi (53 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 proposedOther structural work, including hydraulic replacements
Estimated improvement cost$1.2 million
NavigationNo navigation control on waterway

Frequently asked questions

When was SH 105 over Trinity River built?

It was built in 1967, making it 58 years old in 2025.

What condition is SH 105 over Trinity River 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 SH 105 over Trinity River carry?

About 4,651 vehicles per day (2020 count), of which roughly 21% are trucks.

How long is SH 105 over Trinity River?

The structure is 1,350 ft (411.5 m) long with a longest span of 150 ft (45.7 m) and a deck 37 ft wide.

Who owns SH 105 over Trinity River?

It is owned by the State Highway Agency.