US Bridges

Knolle RD over Drainage Ditch

GoodPosted for load

Fort Bend County, Texas · 0.01 MI N of Big Island · Structure no. 120800AA0718001

Built
1993
32 years old
Condition
Good
inspected October 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
46 ft
3 main spans
Daily traffic
50
2010 count
Owner
County
County Highway Agency

About this bridge

Knolle RD over Drainage Ditch is a wood or timber stringer/multi-beam or girder carrying Knolle RD over Drainage Ditch in Fort Bend County, Texas. It was built in 1993, so it is 32 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. Its operating status is: posted for load restriction.

It carries about 50 vehicles a day, projected to reach 75 by 2030. The structure is 46 ft (14 m) long and 26 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesKnolle RD
CrossesDrainage Ditch
Location0.01 MI N of Big Island
RouteCounty Highway 0
CountyFort Bend County
StateTexas
Coordinates29.31646, -95.67
Functional classRural 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 inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating29 US tons
Inventory rating20.9 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans3
Design loadUnknown
Structure length46 ft (14 m)
Longest span15 ft (4.6 m)
Deck width26 ft (7.8 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2010)
Projected traffic75 by 2030
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$75,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Knolle RD over Drainage Ditch built?

It was built in 1993, making it 32 years old in 2025.

What condition is Knolle RD over Drainage Ditch 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 October 2023.

How much traffic does Knolle RD over Drainage Ditch carry?

About 50 vehicles per day (2010 count).

How long is Knolle RD over Drainage Ditch?

The structure is 46 ft (14 m) long with a longest span of 15 ft (4.6 m) and a deck 26 ft wide.

Who owns Knolle RD over Drainage Ditch?

It is owned by the County Highway Agency.