US Bridges

NW 56th St. over S.H. 74 under

Fair

Oklahoma County, Oklahoma · 1.4 MI N I-44 · Structure no. 210960000000000

Built
1985
40 years old
Condition
Fair
inspected March 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
203 ft
2 main spans
Daily traffic
1,000
2022 count
Owner
State
State Highway Agency

About this bridge

NW 56th St. over S.H. 74 under is a prestressed concrete stringer/multi-beam or girder carrying NW 56th St. over S.H. 74 under in Oklahoma County, Oklahoma. It was built in 1985, so it is 40 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 1,000 vehicles a day, roughly 5% of them trucks, projected to reach 1,600 by 2042. The structure is 203 ft (62 m) long and 60 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesNW 56th St.
CrossesS.H. 74 under
Location1.4 MI N I-44
RouteCity Street 0
CountyOklahoma County
StateOklahoma
Coordinates35.52747, -97.57778
Functional classUrban 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
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry2: Basically intolerable, requiring high priority of replacement
Approach roadway alignment8: Equal to present desirable criteria
Operating rating107 US tons
Inventory rating42 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length203 ft (62 m)
Longest span100 ft (30.5 m)
Deck width60 ft (18.3 m)
Roadway width38 ft (11.6 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,000 (2022)
Projected traffic1,600 by 2042
Trucks5%
Lanes on structure3
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
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$3.4 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was NW 56th St. over S.H. 74 under built?

It was built in 1985, making it 40 years old in 2025.

What condition is NW 56th St. over S.H. 74 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 March 2023.

How much traffic does NW 56th St. over S.H. 74 under carry?

About 1,000 vehicles per day (2022 count), of which roughly 5% are trucks.

How long is NW 56th St. over S.H. 74 under?

The structure is 203 ft (62 m) long with a longest span of 100 ft (30.5 m) and a deck 60 ft wide.

Who owns NW 56th St. over S.H. 74 under?

It is owned by the State Highway Agency.