US Bridges

N4350 over Sulphur Creek

Fair

Mayes County, Oklahoma · 2.2 MI S of SH 20-CARBIDE · Structure no. 233540000000000

Built
1985
40 years old
Condition
Fair
inspected April 2023
Type
Culvert
Concrete
Length
42 ft
3 main spans
Daily traffic
1,007
2022 count
Owner
County
County Highway Agency

About this bridge

N4350 over Sulphur Creek is a concrete culvert carrying N4350 over Sulphur Creek in Mayes County, Oklahoma. It was built in 1985, so it is 40 years old, younger 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.

It carries about 1,007 vehicles a day, roughly 10% of them trucks, projected to reach 1,611 by 2042. The structure is 42 ft (12.8 m) long. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesN4350
CrossesSulphur Creek
Location2.2 MI S of SH 20-CARBIDE
RouteCounty Highway N4350
CountyMayes County
StateOklahoma
Coordinates36.27519, -95.25621
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 protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionApril 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating90.2 US tons
Inventory rating54 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHS 20
Structure length42 ft (12.8 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,007 (2022)
Projected traffic1,611 by 2042
Trucks10%
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$225,000
NavigationNo navigation control on waterway

Frequently asked questions

When was N4350 over Sulphur Creek built?

It was built in 1985, making it 40 years old in 2025.

What condition is N4350 over Sulphur 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 April 2023.

How much traffic does N4350 over Sulphur Creek carry?

About 1,007 vehicles per day (2022 count), of which roughly 10% are trucks.

How long is N4350 over Sulphur Creek?

The structure is 42 ft (12.8 m) long with a longest span of 12 ft (3.7 m).

Who owns N4350 over Sulphur Creek?

It is owned by the County Highway Agency.