US Bridges

I-40 WB over Gnbc R.R. & Neptune Dr.

Fair

Custer County, Oklahoma · South Edge Clinton · Structure no. 175820000000000

Built
1969
56 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
325 ft
4 main spans
Daily traffic
9,250
2022 count
Owner
State
State Highway Agency

About this bridge

I-40 WB over Gnbc R.R. & Neptune Dr. is a steel continuous stringer/multi-beam or girder carrying I-40 WB over Gnbc R.R. & Neptune Dr. in Custer 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 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 9,250 vehicles a day, roughly 12% of them trucks, projected to reach 14,800 by 2042. The structure is 325 ft (99.1 m) long and 40 ft wide.

Location

Open in Google Maps
CarriesI-40 WB
CrossesGnbc R.R. & Neptune Dr.
LocationSouth Edge Clinton
RouteInterstate 40
CountyCuster County
StateOklahoma
Coordinates35.49919, -98.97692
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMarch 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 rating57 US tons
Inventory rating34 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length325 ft (99.1 m)
Longest span100 ft (30.5 m)
Deck width40 ft (12.2 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic9,250 (2022)
Projected traffic14,800 by 2042
Trucks12%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway and railroad
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$8.7 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-40 WB over Gnbc R.R. & Neptune Dr. built?

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

What condition is I-40 WB over Gnbc R.R. & Neptune Dr. 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 WB over Gnbc R.R. & Neptune Dr. carry?

About 9,250 vehicles per day (2022 count), of which roughly 12% are trucks.

How long is I-40 WB over Gnbc R.R. & Neptune Dr.?

The structure is 325 ft (99.1 m) long with a longest span of 100 ft (30.5 m) and a deck 40 ft wide.

Who owns I-40 WB over Gnbc R.R. & Neptune Dr.?

It is owned by the State Highway Agency.