US Bridges

20th W. Ave. over Rock Creek

Fair

Osage County, Oklahoma · 5E Skiatook LAKE;5S SH20 · Structure no. 273990000000000

Built
2006
19 years old
Condition
Fair
inspected February 2024
Type
Tee Beam
Prestressed Concrete
Length
110 ft
3 main spans
Daily traffic
400
2022 count
Owner
County
County Highway Agency

About this bridge

20th W. Ave. over Rock Creek is a prestressed concrete tee beam carrying 20th W. Ave. over Rock Creek in Osage County, Oklahoma. It was built in 2006, so it is 19 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 400 vehicles a day, roughly 10% of them trucks, projected to reach 640 by 2042. The structure is 110 ft (33.5 m) long and 36 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
Carries20th W. Ave.
CrossesRock Creek
Location5E Skiatook LAKE;5S SH20
RouteCounty Highway N3920
CountyOsage County
StateOklahoma
Coordinates36.31399, -96.01385
Functional classRural Local

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.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.5 US tons
Inventory rating36.8 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length110 ft (33.5 m)
Longest span50 ft (15.2 m)
Deck width36 ft (11 m)
Roadway width34 ft (10.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic400 (2022)
Projected traffic640 by 2042
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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$829,000
NavigationNo navigation control on waterway

Frequently asked questions

When was 20th W. Ave. over Rock Creek built?

It was built in 2006, making it 19 years old in 2025.

What condition is 20th W. Ave. over Rock 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 February 2024.

How much traffic does 20th W. Ave. over Rock Creek carry?

About 400 vehicles per day (2022 count), of which roughly 10% are trucks.

How long is 20th W. Ave. over Rock Creek?

The structure is 110 ft (33.5 m) long with a longest span of 50 ft (15.2 m) and a deck 36 ft wide.

Who owns 20th W. Ave. over Rock Creek?

It is owned by the County Highway Agency.