US Bridges

I-40 over Clinton Lake

Fair

Washita County, Oklahoma · 8.1 MI E Beckham C/L · Structure no. 143590000000000

Built
1959
66 years old, rebuilt 1988
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
91 ft
3 main spans
Daily traffic
8,700
2022 count
Owner
State
State Highway Agency

About this bridge

I-40 over Clinton Lake is a steel stringer/multi-beam or girder carrying I-40 over Clinton Lake in Washita County, Oklahoma. It was built in 1959 and reconstructed in 1988, so it is 66 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 8,700 vehicles a day, roughly 36% of them trucks, projected to reach 13,920 by 2042. The structure is 91 ft (27.7 m) long and 41 ft wide.

Location

Open in Google Maps
CarriesI-40
CrossesClinton Lake
Location8.1 MI E Beckham C/L
RouteInterstate 40
CountyWashita County
StateOklahoma
Coordinates35.42252, -99.22309
Functional classRural 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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating71 US tons
Inventory rating42.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length91 ft (27.7 m)
Longest span30 ft (9.1 m)
Deck width41 ft (12.5 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,700 (2022)
Projected traffic13,920 by 2042
Trucks36%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
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$1.4 million
NavigationNo navigation control on waterway

Frequently asked questions

When was I-40 over Clinton Lake built?

It was built in 1959, making it 66 years old in 2025. It was reconstructed in 1988.

What condition is I-40 over Clinton Lake 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 March 2023.

How much traffic does I-40 over Clinton Lake carry?

About 8,700 vehicles per day (2022 count), of which roughly 36% are trucks.

How long is I-40 over Clinton Lake?

The structure is 91 ft (27.7 m) long with a longest span of 30 ft (9.1 m) and a deck 41 ft wide.

Who owns I-40 over Clinton Lake?

It is owned by the State Highway Agency.