US Bridges

D4720 over Cooper Creek

Fair

McCurtain County, Oklahoma · 5.3 E; 2.6 N Broken Bow · Structure no. 177870000000000

Built
1970
55 years old
Condition
Fair
inspected May 2023
Type
Culvert
Concrete
Length
47 ft
3 main spans
Daily traffic
100
2022 count
Owner
County
County Highway Agency

About this bridge

D4720 over Cooper Creek is a concrete culvert carrying D4720 over Cooper Creek in McCurtain County, Oklahoma. It was built in 1970, so it is 55 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.

It carries about 100 vehicles a day, roughly 10% of them trucks, projected to reach 160 by 2042. The structure is 47 ft (14.3 m) long and 31 ft wide. If it were closed, the detour would be 100 mi (161 km).

Location

Open in Google Maps
CarriesD4720
CrossesCooper Creek
Location5.3 E; 2.6 N Broken Bow
RouteCounty Highway D4720
CountyMcCurtain County
StateOklahoma
Coordinates34.06419, -94.64609
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; action required to protect exposed foundations
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating36 US tons
Inventory rating21.1 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHS 20
Structure length47 ft (14.3 m)
Longest span17 ft (5.2 m)
Deck width31 ft (9.4 m)
Roadway width28 ft (8.6 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 closed100 mi (161 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 proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$225,000
NavigationNo navigation control on waterway

Frequently asked questions

When was D4720 over Cooper Creek built?

It was built in 1970, making it 55 years old in 2025.

What condition is D4720 over Cooper 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 May 2023.

How much traffic does D4720 over Cooper Creek carry?

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

How long is D4720 over Cooper Creek?

The structure is 47 ft (14.3 m) long with a longest span of 17 ft (5.2 m) and a deck 31 ft wide.

Who owns D4720 over Cooper Creek?

It is owned by the County Highway Agency.