US Bridges

N4680 over Onion Creek

PoorPosted for load

Sequoyah County, Oklahoma · 1.8D of SH141ATGANS · Structure no. 274680000000000

Built
1992
33 years old
Condition
Poor
inspected June 2023
Type
Culvert
Concrete
Length
27 ft
2 main spans
Daily traffic
100
2022 count
Owner
County
County Highway Agency

About this bridge

N4680 over Onion Creek is a concrete culvert carrying N4680 over Onion Creek in Sequoyah County, Oklahoma. It was built in 1992, so it is 33 years old, younger than the Oklahoma average of 47.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. Its operating status is: posted for load restriction.

It carries about 100 vehicles a day, roughly 10% of them trucks, projected to reach 160 by 2042. The structure is 27 ft (8.2 m) long and 48 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesN4680
CrossesOnion Creek
Location1.8D of SH141ATGANS
RouteCounty Highway N4680
CountySequoyah County
StateOklahoma
Coordinates35.36244, -94.69076
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry9: Superior to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating39 US tons
Inventory rating30 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadUnknown
Structure length27 ft (8.2 m)
Longest span12 ft (3.7 m)
Deck width48 ft (14.6 m)
Roadway width46 ft (14 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 closed3.7 mi (6 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 N4680 over Onion Creek built?

It was built in 1992, making it 33 years old in 2025.

What condition is N4680 over Onion Creek in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in June 2023.

How much traffic does N4680 over Onion Creek carry?

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

How long is N4680 over Onion Creek?

The structure is 27 ft (8.2 m) long with a longest span of 12 ft (3.7 m) and a deck 48 ft wide.

Who owns N4680 over Onion Creek?

It is owned by the County Highway Agency.