US Bridges

Knobcrest DR over Greens Bayou

FairClosed to traffic

Harris County, Texas · 0.1 MI SE of IH 45 · Structure no. 121020AA5741001

Built
1977
48 years old
Condition
Fair
inspected October 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
165 ft
3 main spans
Daily traffic
510
2015 count
Owner
County
County Highway Agency

About this bridge

Knobcrest DR over Greens Bayou is a prestressed concrete box beam or girders - multiple carrying Knobcrest DR over Greens Bayou in Harris County, Texas. It was built in 1977, so it is 48 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. Its operating status is: closed to all traffic.

It carries about 510 vehicles a day, roughly 1% of them trucks, projected to reach 1,000 by 2035. The structure is 165 ft (50.3 m) long and 32 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

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CarriesKnobcrest DR
CrossesGreens Bayou
Location0.1 MI SE of IH 45
RouteCounty Highway 0
CountyHarris County
StateTexas
Coordinates29.95627, -95.41581
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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusClosed to all traffic
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation0: Immediate repair necessary to put back in service
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating0 US tons
Inventory rating0 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadUnknown
Structure length165 ft (50.3 m)
Longest span55 ft (16.8 m)
Deck width32 ft (9.9 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic510 (2015)
Projected traffic1,000 by 2035
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
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 Knobcrest DR over Greens Bayou built?

It was built in 1977, making it 48 years old in 2025.

What condition is Knobcrest DR over Greens 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 October 2023.

How much traffic does Knobcrest DR over Greens Bayou carry?

About 510 vehicles per day (2015 count), of which roughly 1% are trucks.

How long is Knobcrest DR over Greens Bayou?

The structure is 165 ft (50.3 m) long with a longest span of 55 ft (16.8 m) and a deck 32 ft wide.

Who owns Knobcrest DR over Greens Bayou?

It is owned by the County Highway Agency.