US Bridges

I-35 NB over S.H. 74 SB Ramp under

Fair

McClain County, Oklahoma · JCT I-35 & SH 74G · Structure no. 169990000000000

Built
1967
58 years old, rebuilt 2006
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
194 ft
3 main spans
Daily traffic
35,900
2022 count
Owner
State
State Highway Agency

About this bridge

I-35 NB over S.H. 74 SB Ramp under is a steel continuous stringer/multi-beam or girder carrying I-35 NB over S.H. 74 SB Ramp under in McClain County, Oklahoma. It was built in 1967 and reconstructed in 2006, so it is 58 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 35,900 vehicles a day, roughly 36% of them trucks, projected to reach 57,440 by 2042. The structure is 194 ft (59.1 m) long and 40 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesI-35 NB
CrossesS.H. 74 SB Ramp under
LocationJCT I-35 & SH 74G
RouteInterstate 35
CountyMcClain County
StateOklahoma
Coordinates35.04543, -97.37689
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating58 US tons
Inventory rating34 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length194 ft (59.1 m)
Longest span76 ft (23.2 m)
Deck width40 ft (12.1 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic35,900 (2022)
Projected traffic57,440 by 2042
Trucks36%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed5 mi (8 km)
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$1.6 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-35 NB over S.H. 74 SB Ramp under built?

It was built in 1967, making it 58 years old in 2025. It was reconstructed in 2006.

What condition is I-35 NB over S.H. 74 SB Ramp 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 September 2023.

How much traffic does I-35 NB over S.H. 74 SB Ramp under carry?

About 35,900 vehicles per day (2022 count), of which roughly 36% are trucks.

How long is I-35 NB over S.H. 74 SB Ramp under?

The structure is 194 ft (59.1 m) long with a longest span of 76 ft (23.2 m) and a deck 40 ft wide.

Who owns I-35 NB over S.H. 74 SB Ramp under?

It is owned by the State Highway Agency.