US Bridges

N3126 over Cottonwood Creek

Fair

Logan County, Oklahoma · Fifth ST N of Oklahoma ST · Structure no. 165460000000000

Built
1965
60 years old
Condition
Fair
inspected January 2023
Type
Tee Beam
Prestressed Concrete
Length
168 ft
3 main spans
Daily traffic
100
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

N3126 over Cottonwood Creek is a prestressed concrete tee beam carrying N3126 over Cottonwood Creek in Logan County, Oklahoma. It was built in 1965, so it is 60 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.

It carries about 100 vehicles a day, roughly 10% of them trucks, projected to reach 160 by 2042. The structure is 168 ft (51.3 m) long and 30 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesN3126
CrossesCottonwood Creek
LocationFifth ST N of Oklahoma ST
RouteCity Street N3126
CountyLogan County
StateOklahoma
Coordinates35.87847, -97.43154
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.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionJanuary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating36 US tons
Inventory rating20 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length168 ft (51.3 m)
Longest span56 ft (17.1 m)
Deck width30 ft (9.1 m)
Roadway width26 ft (7.9 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 and pedestrian
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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$651,000
NavigationNo navigation control on waterway

Frequently asked questions

When was N3126 over Cottonwood Creek built?

It was built in 1965, making it 60 years old in 2025.

What condition is N3126 over Cottonwood 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 N3126 over Cottonwood Creek carry?

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

How long is N3126 over Cottonwood Creek?

The structure is 168 ft (51.3 m) long with a longest span of 56 ft (17.1 m) and a deck 30 ft wide.

Who owns N3126 over Cottonwood Creek?

It is owned by the City or Municipal Highway Agency.