US Bridges

I-40 over S.H. 18 under

Good

Pottawatomie County, Oklahoma · JCT SH 18 · Structure no. 244670000000000

Built
1997
28 years old
Condition
Good
inspected May 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
239 ft
4 main spans
Daily traffic
11,000
2022 count
Owner
State
State Highway Agency

About this bridge

I-40 over S.H. 18 under is a prestressed concrete stringer/multi-beam or girder carrying I-40 over S.H. 18 under in Pottawatomie County, Oklahoma. It was built in 1997, so it is 28 years old, younger than the Oklahoma average of 47.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 11,000 vehicles a day, roughly 12% of them trucks, projected to reach 17,600 by 2042. The structure is 239 ft (72.8 m) long and 41 ft wide.

Location

Open in Google Maps
CarriesI-40
CrossesS.H. 18 under
LocationJCT SH 18
RouteInterstate 40
CountyPottawatomie County
StateOklahoma
Coordinates35.38372, -96.91249
Functional classUrban Principal Arterial - Interstate

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating63.5 US tons
Inventory rating38 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length239 ft (72.8 m)
Longest span66 ft (20.1 m)
Deck width41 ft (12.5 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,000 (2022)
Projected traffic17,600 by 2042
Trucks12%
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$2.9 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-40 over S.H. 18 under built?

It was built in 1997, making it 28 years old in 2025.

What condition is I-40 over S.H. 18 under in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in May 2023.

How much traffic does I-40 over S.H. 18 under carry?

About 11,000 vehicles per day (2022 count), of which roughly 12% are trucks.

How long is I-40 over S.H. 18 under?

The structure is 239 ft (72.8 m) long with a longest span of 66 ft (20.1 m) and a deck 41 ft wide.

Who owns I-40 over S.H. 18 under?

It is owned by the State Highway Agency.