US Bridges

S.H. 56 over N. Canadian River Oflow

Fair

Okfuskee County, Oklahoma · 3.4 MI E Seminole CO · Structure no. 226660000000000

Built
1990
35 years old
Condition
Fair
inspected September 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
211 ft
3 main spans
Daily traffic
920
2022 count
Owner
State
State Highway Agency

About this bridge

S.H. 56 over N. Canadian River Oflow is a prestressed concrete stringer/multi-beam or girder carrying S.H. 56 over N. Canadian River Oflow 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 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 920 vehicles a day, roughly 15% of them trucks, projected to reach 1,472 by 2042. The structure is 211 ft (64.3 m) long and 34 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesS.H. 56
CrossesN. Canadian River Oflow
Location3.4 MI E Seminole CO
RouteState Highway 56
CountyOkfuskee County
StateOklahoma
Coordinates35.42828, -96.39098
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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating73 US tons
Inventory rating42 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length211 ft (64.3 m)
Longest span70 ft (21.3 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
CrossesRelief for waterway
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$2.1 million
NavigationNo navigation control on waterway

Frequently asked questions

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

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

What condition is S.H. 56 over N. Canadian River Oflow 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 2023.

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

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

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

The structure is 211 ft (64.3 m) long with a longest span of 70 ft (21.3 m) and a deck 34 ft wide.

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

It is owned by the State Highway Agency.