US Bridges

S.H. 66 over Six Mile Creek

Fair

Canadian County, Oklahoma · 1.2 Mi. E. Jct. US81 · Structure no. 279440000000000

Built
2008
17 years old
Condition
Fair
inspected January 2025
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
120 ft
3 main spans
Daily traffic
5,400
2022 count
Owner
State
State Highway Agency

About this bridge

S.H. 66 over Six Mile Creek is a prestressed concrete stringer/multi-beam or girder carrying S.H. 66 over Six Mile Creek in Canadian County, Oklahoma. It was built in 2008, so it is 17 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 5,400 vehicles a day, roughly 5% of them trucks, projected to reach 8,640 by 2042. The structure is 120 ft (36.7 m) long and 83 ft wide. If it were closed, the detour would be 11.8 mi (19 km).

Location

Open in Google Maps
CarriesS.H. 66
CrossesSix Mile Creek
Location1.2 Mi. E. Jct. US81
RouteState Highway 66
CountyCanadian County
StateOklahoma
Coordinates35.50791, -97.91851
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
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 inspectionJanuary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating59 US tons
Inventory rating35.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length120 ft (36.7 m)
Longest span40 ft (12.2 m)
Deck width83 ft (25.3 m)
Roadway width80 ft (24.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,400 (2022)
Projected traffic8,640 by 2042
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed11.8 mi (19 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 million
NavigationNo navigation control on waterway

Frequently asked questions

When was S.H. 66 over Six Mile Creek built?

It was built in 2008, making it 17 years old in 2025.

What condition is S.H. 66 over Six Mile Creek 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 January 2025.

How much traffic does S.H. 66 over Six Mile Creek carry?

About 5,400 vehicles per day (2022 count), of which roughly 5% are trucks.

How long is S.H. 66 over Six Mile Creek?

The structure is 120 ft (36.7 m) long with a longest span of 40 ft (12.2 m) and a deck 83 ft wide.

Who owns S.H. 66 over Six Mile Creek?

It is owned by the State Highway Agency.