US Bridges

N4320 over South Branch Creek

Good

Pushmataha County, Oklahoma · 0.5 N of Oleta · Structure no. 250370000000000

Built
2000
25 years old
Condition
Good
inspected March 2024
Type
Culvert
Concrete
Length
92 ft
5 main spans
Daily traffic
50
2022 count
Owner
County
County Highway Agency

About this bridge

N4320 over South Branch Creek is a concrete culvert carrying N4320 over South Branch Creek in Pushmataha County, Oklahoma. It was built in 2000, so it is 25 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 50 vehicles a day, roughly 10% of them trucks, projected to reach 80 by 2042. The structure is 92 ft (28 m) long and 27 ft wide. If it were closed, the detour would be 100 mi (161 km).

CarriesN4320
CrossesSouth Branch Creek
Location0.5 N of Oleta
RouteCounty Highway N4320
Coordinates34.20792, -95.34365
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 protection7 GoodSome minor problems.
Culvert8 Very GoodNo problems noted.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating49.1 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans5
Design loadHS 20
Structure length92 ft (28 m)
Longest span14 ft (4.4 m)
Deck width27 ft (8.3 m)
Roadway width26 ft (7.8 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 closed100 mi (161 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$225,000
NavigationNo navigation control on waterway

Frequently asked questions

When was N4320 over South Branch Creek built?

It was built in 2000, making it 25 years old in 2025.

What condition is N4320 over South Branch 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 March 2024.

How much traffic does N4320 over South Branch Creek carry?

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

How long is N4320 over South Branch Creek?

The structure is 92 ft (28 m) long with a longest span of 14 ft (4.4 m) and a deck 27 ft wide.

Who owns N4320 over South Branch Creek?

It is owned by the County Highway Agency.