US Bridges

IRR N4520 over Creek

PoorPosted for load

Ottawa County, Oklahoma · 0.4 MI S of E0190 · Structure no. 066130000000000

Built
1939
86 years old
Condition
Poor
inspected September 2023
Type
Culvert
Concrete
Length
30 ft
2 main spans
Daily traffic
50
2022 count
Owner
County
County Highway Agency

About this bridge

IRR N4520 over Creek is a concrete culvert carrying IRR N4520 over Creek in Ottawa County, Oklahoma. It was built in 1939, so it is 86 years old, older than the Oklahoma average of 47.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 50 vehicles a day, roughly 10% of them trucks, projected to reach 80 by 2042. The structure is 30 ft (9.1 m) long and 20 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesIRR N4520
CrossesCreek
Location0.4 MI S of E0190
RouteCounty Highway N4520
CountyOttawa County
StateOklahoma
Coordinates36.73837, -94.94536
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating5.4 US tons
Inventory rating3.2 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadUnknown
Structure length30 ft (9.1 m)
Longest span12 ft (3.7 m)
Deck width20 ft (6 m)
Roadway width18 ft (5.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic50 (2022)
Projected traffic80 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 statusNot eligible for the National Register of Historic Places
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$261,000
NavigationNo navigation control on waterway

Frequently asked questions

When was IRR N4520 over Creek built?

It was built in 1939, making it 86 years old in 2025.

What condition is IRR N4520 over Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in September 2023.

How much traffic does IRR N4520 over Creek carry?

About 50 vehicles per day (2022 count), of which roughly 10% are trucks.

How long is IRR N4520 over Creek?

The structure is 30 ft (9.1 m) long with a longest span of 12 ft (3.7 m) and a deck 20 ft wide.

Who owns IRR N4520 over Creek?

It is owned by the County Highway Agency.