US Bridges

Seward Rd. over I-35 under

Fair

Logan County, Oklahoma · 5N of Oklahoma C\l · Structure no. 290850000000000

Built
2012
13 years old
Condition
Fair
inspected September 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
276 ft
4 main spans
Daily traffic
2,975
2022 count
Owner
State
State Highway Agency

About this bridge

Seward Rd. over I-35 under is a prestressed concrete stringer/multi-beam or girder carrying Seward Rd. over I-35 under in Logan County, Oklahoma. It was built in 2012, so it is 13 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 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 2,975 vehicles a day, roughly 14% of them trucks, projected to reach 4,760 by 2042. The structure is 276 ft (84.1 m) long and 56 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesSeward Rd.
CrossesI-35 under
Location5N of Oklahoma C\l
RouteCounty Highway 0
CountyLogan County
StateOklahoma
Coordinates35.79806, -97.41583
Functional classRural Major Collector

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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
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 rating63.1 US tons
Inventory rating35.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans4
Design loadHL 93
Structure length276 ft (84.1 m)
Longest span89 ft (27.1 m)
Deck width56 ft (17.1 m)
Roadway width54 ft (16.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,975 (2022)
Projected traffic4,760 by 2042
Trucks14%
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$2.2 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was Seward Rd. over I-35 under built?

It was built in 2012, making it 13 years old in 2025.

What condition is Seward Rd. 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 Seward Rd. over I-35 under carry?

About 2,975 vehicles per day (2022 count), of which roughly 14% are trucks.

How long is Seward Rd. over I-35 under?

The structure is 276 ft (84.1 m) long with a longest span of 89 ft (27.1 m) and a deck 56 ft wide.

Who owns Seward Rd. over I-35 under?

It is owned by the State Highway Agency.