US Bridges

U.S. 77 Ramp W-N over I-35 under

Fair

Logan County, Oklahoma · I-35/US 77 Jct. · Structure no. 257860000000000

Built
2001
24 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
531 ft
6 main spans
Daily traffic
13,600
2022 count
Owner
State
State Highway Agency

About this bridge

U.S. 77 Ramp W-N over I-35 under is a prestressed concrete stringer/multi-beam or girder carrying U.S. 77 Ramp W-N over I-35 under in Logan County, Oklahoma. It was built in 2001, so it is 24 years old, younger 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 13,600 vehicles a day, roughly 16% of them trucks, projected to reach 21,760 by 2042. The structure is 531 ft (161.9 m) long and 31 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesU.S. 77 Ramp W-N
CrossesI-35 under
LocationI-35/US 77 Jct.
RouteU.S. Route 77
CountyLogan County
StateOklahoma
Coordinates35.81942, -97.41601
Functional classRural Minor 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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating107 US tons
Inventory rating41 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans6
Design loadHL 93
Structure length531 ft (161.9 m)
Longest span108 ft (32.8 m)
Deck width31 ft (9.6 m)
Roadway width29 ft (8.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,600 (2022)
Projected traffic21,760 by 2042
Trucks16%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.1 mi (5 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$4.1 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was U.S. 77 Ramp W-N over I-35 under built?

It was built in 2001, making it 24 years old in 2025.

What condition is U.S. 77 Ramp W-N over I-35 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 2024.

How much traffic does U.S. 77 Ramp W-N over I-35 under carry?

About 13,600 vehicles per day (2022 count), of which roughly 16% are trucks.

How long is U.S. 77 Ramp W-N over I-35 under?

The structure is 531 ft (161.9 m) long with a longest span of 108 ft (32.8 m) and a deck 31 ft wide.

Who owns U.S. 77 Ramp W-N over I-35 under?

It is owned by the State Highway Agency.