US Bridges

I-40 WB over U.S. 81 under

Fair

Canadian County, Oklahoma · I40 & US81 · Structure no. 167810000000000

Built
1966
59 years old
Condition
Fair
inspected April 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
193 ft
2 main spans
Daily traffic
15,550
2022 count
Owner
State
State Highway Agency

About this bridge

I-40 WB over U.S. 81 under is a steel continuous stringer/multi-beam or girder carrying I-40 WB over U.S. 81 under in Canadian County, Oklahoma. It was built in 1966, so it is 59 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 5 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 15,550 vehicles a day, roughly 43% of them trucks, projected to reach 24,880 by 2042. The structure is 193 ft (58.8 m) long and 48 ft wide.

Location

Open in Google Maps
CarriesI-40 WB
CrossesU.S. 81 under
LocationI40 & US81
RouteInterstate 40
CountyCanadian County
StateOklahoma
Coordinates35.50138, -97.93748
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57 US tons
Inventory rating34 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2 (+2 approach)
Design loadHS 20
Structure length193 ft (58.8 m)
Longest span64 ft (19.5 m)
Deck width48 ft (14.6 m)
Roadway width45 ft (13.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,550 (2022)
Projected traffic24,880 by 2042
Trucks43%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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$2.3 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-40 WB over U.S. 81 under built?

It was built in 1966, making it 59 years old in 2025.

What condition is I-40 WB over U.S. 81 under 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 2023.

How much traffic does I-40 WB over U.S. 81 under carry?

About 15,550 vehicles per day (2022 count), of which roughly 43% are trucks.

How long is I-40 WB over U.S. 81 under?

The structure is 193 ft (58.8 m) long with a longest span of 64 ft (19.5 m) and a deck 48 ft wide.

Who owns I-40 WB over U.S. 81 under?

It is owned by the State Highway Agency.