US Bridges

N4600 over Shiloh Creek

FairPosted for load

Sequoyah County, Oklahoma · 1.5 W .1 N of I-40 · Structure no. 082900000000000

Built
1940
85 years old
Condition
Fair
inspected June 2023
Type
Slab
Concrete
Length
36 ft
3 main spans
Daily traffic
300
2022 count
Owner
County
County Highway Agency

About this bridge

N4600 over Shiloh Creek is a concrete slab carrying N4600 over Shiloh Creek in Sequoyah County, Oklahoma. It was built in 1940, so it is 85 years old, older 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 5 out of 9. The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound. Its operating status is: posted for load restriction.

It carries about 300 vehicles a day, roughly 10% of them trucks, projected to reach 480 by 2042. The structure is 36 ft (11 m) long and 25 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesN4600
CrossesShiloh Creek
Location1.5 W .1 N of I-40
RouteCounty Highway N4600
CountySequoyah County
StateOklahoma
Coordinates35.44974, -94.83184
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating28.5 US tons
Inventory rating17.1 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans3
Design loadHL 93
Structure length36 ft (11 m)
Longest span10 ft (3 m)
Deck width25 ft (7.6 m)
Roadway width23 ft (7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic300 (2022)
Projected traffic480 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$294,000
NavigationNo navigation control on waterway

Frequently asked questions

When was N4600 over Shiloh Creek built?

It was built in 1940, making it 85 years old in 2025.

What condition is N4600 over Shiloh 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 June 2023.

How much traffic does N4600 over Shiloh Creek carry?

About 300 vehicles per day (2022 count), of which roughly 10% are trucks.

How long is N4600 over Shiloh Creek?

The structure is 36 ft (11 m) long with a longest span of 10 ft (3 m) and a deck 25 ft wide.

Who owns N4600 over Shiloh Creek?

It is owned by the County Highway Agency.