US Bridges

N4550 over Creek

FairPosted for load

Delaware County, Oklahoma · 3.5 MI NW Twin Oaks · Structure no. 071340000000000

Built
1939
86 years old
Condition
Fair
inspected January 2023
Type
Culvert
Concrete
Length
43 ft
3 main spans
Daily traffic
100
2022 count
Owner
County
County Highway Agency

About this bridge

N4550 over Creek is a concrete culvert carrying N4550 over Creek in Delaware 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 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. Its operating status is: posted for load restriction.

It carries about 100 vehicles a day, roughly 10% of them trucks, projected to reach 160 by 2042. The structure is 43 ft (13.1 m) long. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesN4550
CrossesCreek
Location3.5 MI NW Twin Oaks
RouteCounty Highway N4550
CountyDelaware County
StateOklahoma
Coordinates36.21668, -94.90451
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
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment7: Better than present minimum criteria
Operating rating47.4 US tons
Inventory rating28.4 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadH 20
Structure length43 ft (13.1 m)
Longest span14 ft (4.3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2022)
Projected traffic160 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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$225,000
NavigationNo navigation control on waterway

Frequently asked questions

When was N4550 over Creek built?

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

What condition is N4550 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 January 2023.

How much traffic does N4550 over Creek carry?

About 100 vehicles per day (2022 count), of which roughly 10% are trucks.

How long is N4550 over Creek?

The structure is 43 ft (13.1 m) long with a longest span of 14 ft (4.3 m).

Who owns N4550 over Creek?

It is owned by the County Highway Agency.