US Bridges

SH 105 over Trinity River Relief

Fair

Liberty County, Texas · 4.5 MI NW of SH 146 · Structure no. 201460095101005

Built
1968
57 years old
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Concrete
Length
801 ft
20 main spans
Daily traffic
5,506
2022 count
Owner
State
State Highway Agency

About this bridge

SH 105 over Trinity River Relief is a concrete stringer/multi-beam or girder carrying SH 105 over Trinity River Relief in Liberty County, Texas. It was built in 1968, so it is 57 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 5,506 vehicles a day, roughly 20% of them trucks, projected to reach 7,120 by 2033. The structure is 801 ft (244.2 m) long and 37 ft wide. If it were closed, the detour would be 19.3 mi (31 km).

CarriesSH 105
CrossesTrinity River Relief
Location4.5 MI NW of SH 146
RouteState Highway 105
StateTexas
Coordinates30.27942, -94.80486
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.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than 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 rating58 US tons
Inventory rating34.9 US tons

Structure

MaterialConcrete
DeckConcrete, cast-in-place
Main spans20
Design loadH 20
Structure length801 ft (244.2 m)
Longest span40 ft (12.2 m)
Deck width37 ft (11.4 m)
Roadway width35 ft (10.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,506 (2022)
Projected traffic7,120 by 2033
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesRelief for waterway
Detour if closed19.3 mi (31 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was SH 105 over Trinity River Relief built?

It was built in 1968, making it 57 years old in 2025.

What condition is SH 105 over Trinity River Relief 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 March 2024.

How much traffic does SH 105 over Trinity River Relief carry?

About 5,506 vehicles per day (2022 count), of which roughly 20% are trucks.

How long is SH 105 over Trinity River Relief?

The structure is 801 ft (244.2 m) long with a longest span of 40 ft (12.2 m) and a deck 37 ft wide.

Who owns SH 105 over Trinity River Relief?

It is owned by the State Highway Agency.