US Bridges

IRR N4520 over Creek

FairPosted for load

Ottawa County, Oklahoma · 1.0 E. & 1.4 S. of Afton · Structure no. 042480000000000

Built
1935
90 years old, rebuilt 2004
Condition
Fair
inspected September 2023
Type
Slab
Concrete
Length
22 ft
1 main span
Daily traffic
125
2022 count
Owner
County
County Highway Agency

About this bridge

IRR N4520 over Creek is a concrete slab carrying IRR N4520 over Creek in Ottawa County, Oklahoma. It was built in 1935 and reconstructed in 2004, so it is 90 years old, older 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. Its operating status is: posted for load restriction.

It carries about 125 vehicles a day, roughly 10% of them trucks, projected to reach 200 by 2042. The structure is 22 ft (6.7 m) long and 30 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesIRR N4520
CrossesCreek
Location1.0 E. & 1.4 S. of Afton
RouteCounty Highway 5820
CountyOttawa County
StateOklahoma
Coordinates36.67374, -94.94536
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
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 inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating19.8 US tons
Inventory rating11.8 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length22 ft (6.7 m)
Longest span20 ft (6.1 m)
Deck width30 ft (9 m)
Roadway width27 ft (8.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic125 (2022)
Projected traffic200 by 2042
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty Highway Agency
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$230,000
NavigationNo navigation control on waterway

Frequently asked questions

When was IRR N4520 over Creek built?

It was built in 1935, making it 90 years old in 2025. It was reconstructed in 2004.

What condition is IRR N4520 over 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 September 2023.

How much traffic does IRR N4520 over Creek carry?

About 125 vehicles per day (2022 count), of which roughly 10% are trucks.

How long is IRR N4520 over Creek?

The structure is 22 ft (6.7 m) long with a longest span of 20 ft (6.1 m) and a deck 30 ft wide.

Who owns IRR N4520 over Creek?

It is owned by the County Highway Agency.