US Bridges

6822C/ N4721 over Flat Rock Creek

FairPosted for load

Sequoyah County, Oklahoma · 2.0 MI NW of US 64 · Structure no. 190210000000000

Built
1975
50 years old
Condition
Fair
inspected June 2024
Type
Culvert
Concrete
Length
106 ft
6 main spans
Daily traffic
300
2022 count
Owner
County
County Highway Agency

About this bridge

6822C/ N4721 over Flat Rock Creek is a concrete culvert carrying 6822C/ N4721 over Flat Rock Creek in Sequoyah County, Oklahoma. It was built in 1975, so it is 50 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 6 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 15% of them trucks, projected to reach 480 by 2042. The structure is 106 ft (32.3 m) long and 32 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

Open in Google Maps
Carries6822C/ N4721
CrossesFlat Rock Creek
Location2.0 MI NW of US 64
RouteCounty Highway 6822C
CountySequoyah County
StateOklahoma
Coordinates35.42657, -94.6182
Functional classRural Major Collector

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 inspectionJune 2024
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating31.7 US tons
Inventory rating19.1 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans6
Design loadHL 93
Structure length106 ft (32.3 m)
Longest span17 ft (5.2 m)
Deck width32 ft (9.8 m)
Roadway width30 ft (9.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic300 (2022)
Projected traffic480 by 2042
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 6822C/ N4721 over Flat Rock Creek built?

It was built in 1975, making it 50 years old in 2025.

What condition is 6822C/ N4721 over Flat Rock 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 2024.

How much traffic does 6822C/ N4721 over Flat Rock Creek carry?

About 300 vehicles per day (2022 count), of which roughly 15% are trucks.

How long is 6822C/ N4721 over Flat Rock Creek?

The structure is 106 ft (32.3 m) long with a longest span of 17 ft (5.2 m) and a deck 32 ft wide.

Who owns 6822C/ N4721 over Flat Rock Creek?

It is owned by the County Highway Agency.