US Bridges

N3700 over Bois Darc Creek

Good

Bryan County, Oklahoma · 1.W 7 1.5 N of Cobb · Structure no. 254850000000000

Built
2000
25 years old
Condition
Good
inspected May 2024
Type
Tee Beam
Prestressed Concrete
Length
105 ft
3 main spans
Daily traffic
75
2022 count
Owner
County
County Highway Agency

About this bridge

N3700 over Bois Darc Creek is a prestressed concrete tee beam carrying N3700 over Bois Darc Creek in Bryan County, Oklahoma. It was built in 2000, so it is 25 years old, younger than the Oklahoma average of 47.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 75 vehicles a day, roughly 10% of them trucks, projected to reach 120 by 2042. The structure is 105 ft (32.1 m) long and 28 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesN3700
CrossesBois Darc Creek
Location1.W 7 1.5 N of Cobb
RouteCounty Highway N3700
Coordinates34.10442, -96.42523
Functional classRural Local

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMay 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating60.5 US tons
Inventory rating36.2 US tons

Structure

Structure typeTee Beam
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length105 ft (32.1 m)
Longest span40 ft (12.2 m)
Deck width28 ft (8.5 m)
Roadway width26 ft (8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic75 (2022)
Projected traffic120 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$523,000
NavigationNo navigation control on waterway

Frequently asked questions

When was N3700 over Bois Darc Creek built?

It was built in 2000, making it 25 years old in 2025.

What condition is N3700 over Bois Darc Creek in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in May 2024.

How much traffic does N3700 over Bois Darc Creek carry?

About 75 vehicles per day (2022 count), of which roughly 10% are trucks.

How long is N3700 over Bois Darc Creek?

The structure is 105 ft (32.1 m) long with a longest span of 40 ft (12.2 m) and a deck 28 ft wide.

Who owns N3700 over Bois Darc Creek?

It is owned by the County Highway Agency.