US Bridges

N4570 over Coal Creek

Good

Le Flore County, Oklahoma · 1.5 N; 1.2 E Fanshawe · Structure no. 224360000000000

Built
1990
35 years old
Condition
Good
inspected January 2023
Type
Culvert
Concrete
Length
31 ft
2 main spans
Daily traffic
100
2022 count
Owner
County
County Highway Agency

About this bridge

N4570 over Coal Creek is a concrete culvert carrying N4570 over Coal Creek in Le Flore County, Oklahoma. It was built in 1990, so it is 35 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 100 vehicles a day, roughly 10% of them trucks, projected to reach 160 by 2042. The structure is 31 ft (9.4 m) long and 18 ft wide. If it were closed, the detour would be 123.7 mi (199 km).

CarriesN4570
CrossesCoal Creek
Location1.5 N; 1.2 E Fanshawe
RouteCounty Highway N4570
Coordinates34.96437, -94.88875
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
Channel and channel protection4 PoorAdvanced section loss, deterioration, spalling or scour.
Culvert8 Very GoodNo problems noted.
Last inspectionJanuary 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 geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy8: Equal to present desirable criteria
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 typeCulvert
MaterialConcrete
DeckNot applicable
Main spans2
Design loadHS 20
Structure length31 ft (9.4 m)
Longest span14 ft (4.3 m)
Deck width18 ft (5.5 m)
Roadway width16 ft (4.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2022)
Projected traffic160 by 2042
Trucks10%
Lanes on structure1
Traffic directionOne-lane bridge for two-way traffic
CarriesHighway
CrossesWaterway
Detour if closed123.7 mi (199 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 N4570 over Coal Creek built?

It was built in 1990, making it 35 years old in 2025.

What condition is N4570 over Coal 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 January 2023.

How much traffic does N4570 over Coal Creek carry?

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

How long is N4570 over Coal Creek?

The structure is 31 ft (9.4 m) long with a longest span of 14 ft (4.3 m) and a deck 18 ft wide.

Who owns N4570 over Coal Creek?

It is owned by the County Highway Agency.