US Bridges

S.H. 18 over Cimarron Tp (US412) Und

Fair

Pawnee County, Oklahoma · 4.4 MI N Payne CO · Structure no. 187360000000000

Built
1974
51 years old
Condition
Fair
inspected May 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
152 ft
2 main spans
Daily traffic
1,200
2022 count
Owner
State
State Highway Agency

About this bridge

S.H. 18 over Cimarron Tp (US412) Und is a prestressed concrete stringer/multi-beam or girder carrying S.H. 18 over Cimarron Tp (US412) Und in Pawnee County, Oklahoma. It was built in 1974, so it is 51 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 1,200 vehicles a day, roughly 15% of them trucks, projected to reach 1,920 by 2042. The structure is 152 ft (46.3 m) long and 47 ft wide. If it were closed, the detour would be 39.8 mi (64 km).

Location

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CarriesS.H. 18
CrossesCimarron Tp (US412) Und
Location4.4 MI N Payne CO
RouteState Highway 18
CountyPawnee County
StateOklahoma
Coordinates36.22464, -96.78415
Functional classRural Minor 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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating72 US tons
Inventory rating45 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length152 ft (46.3 m)
Longest span76 ft (23.1 m)
Deck width47 ft (14.3 m)
Roadway width45 ft (13.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,200 (2022)
Projected traffic1,920 by 2042
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed39.8 mi (64 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1.9 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was S.H. 18 over Cimarron Tp (US412) Und built?

It was built in 1974, making it 51 years old in 2025.

What condition is S.H. 18 over Cimarron Tp (US412) Und 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 May 2024.

How much traffic does S.H. 18 over Cimarron Tp (US412) Und carry?

About 1,200 vehicles per day (2022 count), of which roughly 15% are trucks.

How long is S.H. 18 over Cimarron Tp (US412) Und?

The structure is 152 ft (46.3 m) long with a longest span of 76 ft (23.1 m) and a deck 47 ft wide.

Who owns S.H. 18 over Cimarron Tp (US412) Und?

It is owned by the State Highway Agency.