US Bridges

Service Road over Onion Bayou

Fair

Chambers County, Texas · Reservoir Road · Structure no. 000021521-00101

Built
2005
20 years old
Condition
Fair
inspected April 2022
Type
Slab
Prestressed Concrete
Length
103 ft
2 main spans
Daily traffic
1
2022 count
Owner
Federal
Bureau of Fish and Wildlife

About this bridge

Service Road over Onion Bayou is a prestressed concrete slab carrying Service Road over Onion Bayou in Chambers County, Texas. It was built in 2005, so it is 20 years old, younger 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 vehicles a day, projected to reach 1 by 2042. The structure is 103 ft (31.4 m) long and 16 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

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CarriesService Road
CrossesOnion Bayou
LocationReservoir Road
RouteFederal Lands Road 0
CountyChambers County
StateTexas
Coordinates29.60583, -94.458
Functional classRural Local

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 inspectionApril 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating83 US tons
Inventory rating49.1 US tons

Structure

Structure typeSlab
MaterialPrestressed Concrete
DeckOther
Main spans2
Design loadUnknown
Structure length103 ft (31.4 m)
Longest span49 ft (14.9 m)
Deck width16 ft (4.8 m)
Roadway width14 ft (4.3 m)
Vertical clearance over deck107 ft (32.7 m)

Traffic and service

Average daily traffic1 (2022)
Projected traffic1 by 2042
Trucks0%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerBureau of Fish and Wildlife
Maintained byBureau of Fish and Wildlife
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Service Road over Onion Bayou built?

It was built in 2005, making it 20 years old in 2025.

What condition is Service Road over Onion Bayou 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 2022.

How much traffic does Service Road over Onion Bayou carry?

About 1 vehicles per day (2022 count).

How long is Service Road over Onion Bayou?

The structure is 103 ft (31.4 m) long with a longest span of 49 ft (14.9 m) and a deck 16 ft wide.

Who owns Service Road over Onion Bayou?

It is owned by the Bureau of Fish and Wildlife.