US Bridges

N4550 RD over I-40 under

Fair

Sequoyah County, Oklahoma · 11.00 E Muskogee C/L · Structure no. 169640000000000

Built
1967
58 years old
Condition
Fair
inspected October 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
230 ft
2 main spans
Daily traffic
125
2022 count
Owner
State
State Highway Agency

About this bridge

N4550 RD over I-40 under is a steel continuous stringer/multi-beam or girder carrying N4550 RD over I-40 under in Sequoyah County, Oklahoma. It was built in 1967, so it is 58 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 125 vehicles a day, roughly 15% of them trucks, projected to reach 200 by 2042. The structure is 230 ft (70.1 m) long and 28 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesN4550 RD
CrossesI-40 under
Location11.00 E Muskogee C/L
RouteCounty Highway N4550
CountySequoyah County
StateOklahoma
Coordinates35.45918, -94.9203
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.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
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 alignment7: Better than present minimum criteria
Operating rating42.5 US tons
Inventory rating25.4 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans2 (+2 approach)
Design loadH 15
Structure length230 ft (70.1 m)
Longest span80 ft (24.4 m)
Deck width28 ft (8.5 m)
Roadway width24 ft (7.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic125 (2022)
Projected traffic200 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$2.1 million
NavigationNot applicable (no waterway)

Frequently asked questions

When was N4550 RD over I-40 under built?

It was built in 1967, making it 58 years old in 2025.

What condition is N4550 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 N4550 RD over I-40 under carry?

About 125 vehicles per day (2022 count), of which roughly 15% are trucks.

How long is N4550 RD over I-40 under?

The structure is 230 ft (70.1 m) long with a longest span of 80 ft (24.4 m) and a deck 28 ft wide.

Who owns N4550 RD over I-40 under?

It is owned by the State Highway Agency.