US Bridges

Knoll Forest DR over Rabbs Bayou

Good

Fort Bend County, Texas · 0.15 MI S of Sansbury · Structure no. 120800AA1123001

Built
1991
34 years old
Condition
Good
inspected September 2023
Type
Box Beam or Girders - Multiple
Prestressed Concrete
Length
202 ft
5 main spans
Daily traffic
300
2009 count
Owner
County
County Highway Agency

About this bridge

Knoll Forest DR over Rabbs Bayou is a prestressed concrete box beam or girders - multiple carrying Knoll Forest DR over Rabbs Bayou in Fort Bend County, Texas. It was built in 1991, so it is 34 years old, younger than the Texas average of 44.4 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 300 vehicles a day, projected to reach 500 by 2029. The structure is 202 ft (61.6 m) long and 37 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesKnoll Forest DR
CrossesRabbs Bayou
Location0.15 MI S of Sansbury
RouteCounty Highway 0
CountyFort Bend County
StateTexas
Coordinates29.54841, -95.69123
Functional classUrban Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being 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 typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans5
Design loadUnknown
Structure length202 ft (61.6 m)
Longest span40 ft (12.2 m)
Deck width37 ft (11.4 m)
Roadway width27 ft (8.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic300 (2009)
Projected traffic500 by 2029
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
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 statusNot eligible for the National Register of Historic Places
Work proposedOther structural work, including hydraulic replacements
Estimated improvement cost$136,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Knoll Forest DR over Rabbs Bayou built?

It was built in 1991, making it 34 years old in 2025.

What condition is Knoll Forest DR over Rabbs Bayou in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in September 2023.

How much traffic does Knoll Forest DR over Rabbs Bayou carry?

About 300 vehicles per day (2009 count).

How long is Knoll Forest DR over Rabbs Bayou?

The structure is 202 ft (61.6 m) long with a longest span of 40 ft (12.2 m) and a deck 37 ft wide.

Who owns Knoll Forest DR over Rabbs Bayou?

It is owned by the County Highway Agency.