US Bridges

N3690 over Walnut Branch

Fair

Coal County, Oklahoma · 2.7 E & .6 N of Bromide · Structure no. 212630000000000

Built
1986
39 years old
Condition
Fair
inspected February 2024
Type
Slab
Concrete Continuous
Length
52 ft
2 main spans
Daily traffic
100
2022 count
Owner
County
County Highway Agency

About this bridge

N3690 over Walnut Branch is a concrete continuous slab carrying N3690 over Walnut Branch in Coal County, Oklahoma. It was built in 1986, so it is 39 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 100 vehicles a day, roughly 10% of them trucks, projected to reach 160 by 2042. The structure is 52 ft (15.8 m) long and 22 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesN3690
CrossesWalnut Branch
Location2.7 E & .6 N of Bromide
RouteCounty Highway N3690
CountyCoal County
StateOklahoma
Coordinates34.42664, -96.44239
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionFebruary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment5: Somewhat better than minimum adequacy to tolerate being left in place as is
Operating rating36 US tons
Inventory rating21.1 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadH 15
Structure length52 ft (15.8 m)
Longest span19 ft (5.8 m)
Deck width22 ft (6.7 m)
Roadway width20 ft (6.1 m)
Vertical clearance over deck16 ft (5 m)

Traffic and service

Average daily traffic100 (2022)
Projected traffic160 by 2042
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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$357,000
NavigationNo navigation control on waterway

Frequently asked questions

When was N3690 over Walnut Branch built?

It was built in 1986, making it 39 years old in 2025.

What condition is N3690 over Walnut Branch 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 February 2024.

How much traffic does N3690 over Walnut Branch carry?

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

How long is N3690 over Walnut Branch?

The structure is 52 ft (15.8 m) long with a longest span of 19 ft (5.8 m) and a deck 22 ft wide.

Who owns N3690 over Walnut Branch?

It is owned by the County Highway Agency.