US Bridges

NS-183 Co. Rd. over I-40 under

Good

Beckham County, Oklahoma · 16.5 MI E Texas St. Line · Structure no. 175620000000000

Built
1969
56 years old
Condition
Good
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
261 ft
2 main spans
Daily traffic
101
2022 count
Owner
State
State Highway Agency

About this bridge

NS-183 Co. Rd. over I-40 under is a steel continuous stringer/multi-beam or girder carrying NS-183 Co. Rd. over I-40 under in Beckham County, Oklahoma. It was built in 1969, so it is 56 years old, older 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 101 vehicles a day, roughly 20% of them trucks, projected to reach 162 by 2042. The structure is 261 ft (79.6 m) long and 29 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesNS-183 Co. Rd.
CrossesI-40 under
Location16.5 MI E Texas St. Line
RouteCounty Highway N1830
CountyBeckham County
StateOklahoma
Coordinates35.25917, -99.72028
Functional classRural Local

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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating41 US tons
Inventory rating25 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2 (+2 approach)
Design loadH 15
Structure length261 ft (79.6 m)
Longest span95 ft (29 m)
Deck width29 ft (8.8 m)
Roadway width27 ft (8.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic101 (2022)
Projected traffic162 by 2042
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.9 mi (3 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 NS-183 Co. Rd. over I-40 under built?

It was built in 1969, making it 56 years old in 2025.

What condition is NS-183 Co. Rd. over I-40 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 March 2023.

How much traffic does NS-183 Co. Rd. over I-40 under carry?

About 101 vehicles per day (2022 count), of which roughly 20% are trucks.

How long is NS-183 Co. Rd. over I-40 under?

The structure is 261 ft (79.6 m) long with a longest span of 95 ft (29 m) and a deck 29 ft wide.

Who owns NS-183 Co. Rd. over I-40 under?

It is owned by the State Highway Agency.