US Bridges

N4660 RD over I-40 under

Fair

Sequoyah County, Oklahoma · 4.81 E JCT US-59 · Structure no. 161270000000000

Built
1964
61 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
195 ft
4 main spans
Daily traffic
101
2022 count
Owner
State
State Highway Agency

About this bridge

N4660 RD over I-40 under is a steel stringer/multi-beam or girder carrying N4660 RD over I-40 under in Sequoyah County, Oklahoma. It was built in 1964, so it is 61 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.

It carries about 101 vehicles a day, roughly 15% of them trucks, projected to reach 162 by 2042. The structure is 195 ft (59.4 m) long and 27 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

Open in Google Maps
CarriesN4660 RD
CrossesI-40 under
Location4.81 E JCT US-59
RouteCounty Highway N4660
CountySequoyah County
StateOklahoma
Coordinates35.43502, -94.72748
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating38.6 US tons
Inventory rating23.1 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans4
Design loadH 15
Structure length195 ft (59.4 m)
Longest span64 ft (19.5 m)
Deck width27 ft (8.2 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic101 (2022)
Projected traffic162 by 2042
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState 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$1.9 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was N4660 RD over I-40 under built?

It was built in 1964, making it 61 years old in 2025.

What condition is N4660 RD over I-40 under 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 October 2023.

How much traffic does N4660 RD over I-40 under carry?

About 101 vehicles per day (2022 count), of which roughly 15% are trucks.

How long is N4660 RD over I-40 under?

The structure is 195 ft (59.4 m) long with a longest span of 64 ft (19.5 m) and a deck 27 ft wide.

Who owns N4660 RD over I-40 under?

It is owned by the State Highway Agency.