US Bridges

N1980 over Buffalo Creek

Good

Harper County, Oklahoma · .3W 1.2N of Selman · Structure no. 124740000000000

Built
1950
75 years old, rebuilt 2008
Condition
Good
inspected May 2024
Type
Stringer/Multi-beam or Girder
Steel
Length
241 ft
6 main spans
Daily traffic
100
2022 count
Owner
County
County Highway Agency

About this bridge

N1980 over Buffalo Creek is a steel stringer/multi-beam or girder carrying N1980 over Buffalo Creek in Harper County, Oklahoma. It was built in 1950 and reconstructed in 2008, so it is 75 years old, older 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 15% of them trucks, projected to reach 160 by 2042. The structure is 241 ft (73.5 m) long and 27 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

CarriesN1980
CrossesBuffalo Creek
Location.3W 1.2N of Selman
RouteCounty Highway N1980
Coordinates36.82183, -99.49349
Functional classRural Major Collector

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating103 US tons
Inventory rating61.9 US tons

Structure

MaterialSteel
DeckConcrete, cast-in-place
Main spans6
Design loadH 15
Structure length241 ft (73.5 m)
Longest span40 ft (12.2 m)
Deck width27 ft (8.1 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2022)
Projected traffic160 by 2042
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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$792,000
NavigationNo navigation control on waterway

Frequently asked questions

When was N1980 over Buffalo Creek built?

It was built in 1950, making it 75 years old in 2025. It was reconstructed in 2008.

What condition is N1980 over Buffalo 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 May 2024.

How much traffic does N1980 over Buffalo Creek carry?

About 100 vehicles per day (2022 count), of which roughly 15% are trucks.

How long is N1980 over Buffalo Creek?

The structure is 241 ft (73.5 m) long with a longest span of 40 ft (12.2 m) and a deck 27 ft wide.

Who owns N1980 over Buffalo Creek?

It is owned by the County Highway Agency.