US Bridges

S.H. 18 over U.S. 270 under

Fair

Pottawatomie County, Oklahoma · 3.5 MI S JCT SH 3 · Structure no. 153370000000000

Built
1961
64 years old, rebuilt 1989
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
166 ft
4 main spans
Daily traffic
2,550
2022 count
Owner
State
State Highway Agency

About this bridge

S.H. 18 over U.S. 270 under is a steel stringer/multi-beam or girder carrying S.H. 18 over U.S. 270 under in Pottawatomie County, Oklahoma. It was built in 1961 and reconstructed in 1989, so it is 64 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 2,550 vehicles a day, roughly 7% of them trucks, projected to reach 4,080 by 2042. The structure is 166 ft (50.6 m) long and 41 ft wide.

Location

Open in Google Maps
CarriesS.H. 18
CrossesU.S. 270 under
Location3.5 MI S JCT SH 3
RouteState Highway 18
CountyPottawatomie County
StateOklahoma
Coordinates35.32141, -96.94351
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMay 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 geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating53.6 US tons
Inventory rating32.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadH 20
Structure length166 ft (50.6 m)
Longest span53 ft (16.2 m)
Deck width41 ft (12.4 m)
Roadway width38 ft (11.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,550 (2022)
Projected traffic4,080 by 2042
Trucks7%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed—
TollOn a free road
National Highway SystemYes

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$3 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was S.H. 18 over U.S. 270 under built?

It was built in 1961, making it 64 years old in 2025. It was reconstructed in 1989.

What condition is S.H. 18 over U.S. 270 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 May 2023.

How much traffic does S.H. 18 over U.S. 270 under carry?

About 2,550 vehicles per day (2022 count), of which roughly 7% are trucks.

How long is S.H. 18 over U.S. 270 under?

The structure is 166 ft (50.6 m) long with a longest span of 53 ft (16.2 m) and a deck 41 ft wide.

Who owns S.H. 18 over U.S. 270 under?

It is owned by the State Highway Agency.