US Bridges

N2520 over Little Driftwood Creek

Good

Alfalfa County, Oklahoma · 2W 2.5N of SH8/SH11 JCT · Structure no. 305660000000000

Built
2012
13 years old
Condition
Good
inspected June 2024
Type
Culvert
Steel
Length
25 ft
2 main spans
Daily traffic
100
2022 count
Owner
County
County Highway Agency

About this bridge

N2520 over Little Driftwood Creek is a steel culvert carrying N2520 over Little Driftwood Creek in Alfalfa County, Oklahoma. It was built in 2012, so it is 13 years old, younger than the Oklahoma average of 47.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 100 vehicles a day, roughly 10% of them trucks, projected to reach 160 by 2042. The structure is 25 ft (7.6 m) long and 26 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

CarriesN2520
CrossesLittle Driftwood Creek
Location2W 2.5N of SH8/SH11 JCT
RouteCounty Highway N2520
Coordinates36.93556, -98.52222
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert7 GoodSome minor problems.
Last inspectionJune 2024
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 rating21.1 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans2
Design loadHS 20
Structure length25 ft (7.6 m)
Longest span10 ft (3 m)
Deck width26 ft (7.9 m)
Roadway width24 ft (7.3 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 closed3.1 mi (5 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 proposedNone recorded
Estimated improvement cost$225,000
NavigationNo navigation control on waterway

Frequently asked questions

When was N2520 over Little Driftwood Creek built?

It was built in 2012, making it 13 years old in 2025.

What condition is N2520 over Little Driftwood Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in June 2024.

How much traffic does N2520 over Little Driftwood Creek carry?

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

How long is N2520 over Little Driftwood Creek?

The structure is 25 ft (7.6 m) long with a longest span of 10 ft (3 m) and a deck 26 ft wide.

Who owns N2520 over Little Driftwood Creek?

It is owned by the County Highway Agency.