US Bridges

Market ST over Carpenters Bayou

FairPosted for load

Harris County, Texas · 1.2 MI W of Sheldon RD · Structure no. 121020AA4850001

Built
1940
85 years old, rebuilt 1945
Condition
Fair
inspected November 2023
Type
Slab
Concrete
Length
142 ft
7 main spans
Daily traffic
6,745
2009 count
Owner
County
County Highway Agency

About this bridge

Market ST over Carpenters Bayou is a concrete slab carrying Market ST over Carpenters Bayou in Harris County, Texas. It was built in 1940 and reconstructed in 1945, so it is 85 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. Its operating status is: posted for load restriction.

It carries about 6,745 vehicles a day, roughly 5% of them trucks, projected to reach 8,000 by 2028. The structure is 142 ft (43.3 m) long and 36 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesMarket ST
CrossesCarpenters Bayou
Location1.2 MI W of Sheldon RD
RouteCounty Highway 0
CountyHarris County
StateTexas
Coordinates29.77118, -95.14332
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36 US tons
Inventory rating27 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans7
Design loadUnknown
Structure length142 ft (43.3 m)
Longest span20 ft (6.1 m)
Deck width36 ft (11 m)
Roadway width33 ft (10.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,745 (2009)
Projected traffic8,000 by 2028
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Market ST over Carpenters Bayou built?

It was built in 1940, making it 85 years old in 2025. It was reconstructed in 1945.

What condition is Market ST over Carpenters 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 November 2023.

How much traffic does Market ST over Carpenters Bayou carry?

About 6,745 vehicles per day (2009 count), of which roughly 5% are trucks.

How long is Market ST over Carpenters Bayou?

The structure is 142 ft (43.3 m) long with a longest span of 20 ft (6.1 m) and a deck 36 ft wide.

Who owns Market ST over Carpenters Bayou?

It is owned by the County Highway Agency.