US Bridges

S.H. 56 over N. Canadian River

Fair

Okfuskee County, Oklahoma · 2.5 MI E Seminole CO · Structure no. 226860000000000

Built
1990
35 years old
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
1,500 ft
15 main spans
Daily traffic
920
2022 count
Owner
State
State Highway Agency

About this bridge

S.H. 56 over N. Canadian River is a prestressed concrete stringer/multi-beam or girder carrying S.H. 56 over N. Canadian River in Okfuskee County, Oklahoma. It was built in 1990, so it is 35 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 920 vehicles a day, roughly 15% of them trucks, projected to reach 1,472 by 2042. The structure is 1,500 ft (457.2 m) long and 34 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

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CarriesS.H. 56
CrossesN. Canadian River
Location2.5 MI E Seminole CO
RouteState Highway 56
CountyOkfuskee County
StateOklahoma
Coordinates35.42932, -96.40906
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
Deck7 GoodSome minor problems.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating98 US tons
Inventory rating37 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans15
Design loadHS 20
Structure length1,500 ft (457.2 m)
Longest span100 ft (30.5 m)
Deck width34 ft (10.4 m)
Roadway width32 ft (9.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic920 (2022)
Projected traffic1,472 by 2042
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$7.9 million
NavigationNo navigation control on waterway

Frequently asked questions

When was S.H. 56 over N. Canadian River built?

It was built in 1990, making it 35 years old in 2025.

What condition is S.H. 56 over N. Canadian River 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 2024.

How much traffic does S.H. 56 over N. Canadian River carry?

About 920 vehicles per day (2022 count), of which roughly 15% are trucks.

How long is S.H. 56 over N. Canadian River?

The structure is 1,500 ft (457.2 m) long with a longest span of 100 ft (30.5 m) and a deck 34 ft wide.

Who owns S.H. 56 over N. Canadian River?

It is owned by the State Highway Agency.