US Bridges

Knob Hill RD over W Prong Sister Grove Ck

FairPosted for load

Grayson County, Texas · 2.70 MI E of SH 5 · Structure no. 010920AA0220001

Built
1986
39 years old
Condition
Fair
inspected April 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
78 ft
1 main span
Daily traffic
145
2023 count
Owner
County
County Highway Agency

About this bridge

Knob Hill RD over W Prong Sister Grove Ck is a steel stringer/multi-beam or girder carrying Knob Hill RD over W Prong Sister Grove Ck in Grayson County, Texas. It was built in 1986, so it is 39 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 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 145 vehicles a day, projected to reach 75 by 2030. The structure is 78 ft (23.8 m) long and 24 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
CarriesKnob Hill RD
CrossesW Prong Sister Grove Ck
Location2.70 MI E of SH 5
RouteCounty Highway 0
CountyGrayson County
StateTexas
Coordinates33.47768, -96.56253
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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionApril 2024
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 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 rating41 US tons
Inventory rating24 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans1 (+2 approach)
Design loadUnknown
Structure length78 ft (23.8 m)
Longest span40 ft (12.2 m)
Deck width24 ft (7.3 m)
Roadway width23 ft (7.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic145 (2023)
Projected traffic75 by 2030
Trucks0%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 Knob Hill RD over W Prong Sister Grove Ck built?

It was built in 1986, making it 39 years old in 2025.

What condition is Knob Hill RD over W Prong Sister Grove Ck 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 2024.

How much traffic does Knob Hill RD over W Prong Sister Grove Ck carry?

About 145 vehicles per day (2023 count).

How long is Knob Hill RD over W Prong Sister Grove Ck?

The structure is 78 ft (23.8 m) long with a longest span of 40 ft (12.2 m) and a deck 24 ft wide.

Who owns Knob Hill RD over W Prong Sister Grove Ck?

It is owned by the County Highway Agency.