US Bridges

S.H. 51 (sixth St) over Stilwater Creek Oflow

Fair

Payne County, Oklahoma · 3.0 MI W JCT US 177 · Structure no. 049320000000000

Built
1936
89 years old, rebuilt 1974
Condition
Fair
inspected January 2024
Type
Culvert
Concrete
Length
44 ft
3 main spans
Daily traffic
14,200
2022 count
Owner
State
State Highway Agency

About this bridge

S.H. 51 (sixth St) over Stilwater Creek Oflow is a concrete culvert carrying S.H. 51 (sixth St) over Stilwater Creek Oflow in Payne County, Oklahoma. It was built in 1936 and reconstructed in 1974, so it is 89 years old, older than the Oklahoma average of 47.8 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.

It carries about 14,200 vehicles a day, roughly 15% of them trucks, projected to reach 22,720 by 2042. The structure is 44 ft (13.3 m) long. If it were closed, the detour would be 36 mi (58 km).

Location

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CarriesS.H. 51 (sixth St)
CrossesStilwater Creek Oflow
Location3.0 MI W JCT US 177
RouteState Highway 51
CountyPayne County
StateOklahoma
Coordinates36.11569, -97.10512
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Channel and channel protection8 Very GoodNo problems noted.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating110.1 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadH 20
Structure length44 ft (13.3 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic14,200 (2022)
Projected traffic22,720 by 2042
Trucks15%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway
CrossesRelief for waterway
Detour if closed36 mi (58 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$900,000
NavigationNo navigation control on waterway

Frequently asked questions

When was S.H. 51 (sixth St) over Stilwater Creek Oflow built?

It was built in 1936, making it 89 years old in 2025. It was reconstructed in 1974.

What condition is S.H. 51 (sixth St) over Stilwater Creek Oflow 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 January 2024.

How much traffic does S.H. 51 (sixth St) over Stilwater Creek Oflow carry?

About 14,200 vehicles per day (2022 count), of which roughly 15% are trucks.

How long is S.H. 51 (sixth St) over Stilwater Creek Oflow?

The structure is 44 ft (13.3 m) long with a longest span of 10 ft (3 m).

Who owns S.H. 51 (sixth St) over Stilwater Creek Oflow?

It is owned by the State Highway Agency.