US Bridges

I-35 NB over S.H. 77D under

Fair

Murray County, Oklahoma · 4.8 MI N Carter C/L · Structure no. 174890000000000

Built
1969
56 years old
Condition
Fair
inspected January 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
143 ft
3 main spans
Daily traffic
15,600
2022 count
Owner
State
State Highway Agency

About this bridge

I-35 NB over S.H. 77D under is a steel continuous stringer/multi-beam or girder carrying I-35 NB over S.H. 77D under in Murray 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 6 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 15,600 vehicles a day, roughly 36% of them trucks, projected to reach 24,960 by 2042. The structure is 143 ft (43.6 m) long and 40 ft wide.

Location

Open in Google Maps
CarriesI-35 NB
CrossesS.H. 77D under
Location4.8 MI N Carter C/L
RouteInterstate 35
CountyMurray County
StateOklahoma
Coordinates34.44404, -97.12906
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionJanuary 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 rating77.1 US tons
Inventory rating46 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length143 ft (43.6 m)
Longest span60 ft (18.3 m)
Deck width40 ft (12.1 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,600 (2022)
Projected traffic24,960 by 2042
Trucks36%
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$1.8 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was I-35 NB over S.H. 77D under built?

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

What condition is I-35 NB over S.H. 77D 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 January 2023.

How much traffic does I-35 NB over S.H. 77D under carry?

About 15,600 vehicles per day (2022 count), of which roughly 36% are trucks.

How long is I-35 NB over S.H. 77D under?

The structure is 143 ft (43.6 m) long with a longest span of 60 ft (18.3 m) and a deck 40 ft wide.

Who owns I-35 NB over S.H. 77D under?

It is owned by the State Highway Agency.