US Bridges

N4475 over Grand River

Fair

Mayes County, Oklahoma · N4475E0380003 · Structure no. 095390000000000

Built
1938
87 years old
Condition
Fair
inspected November 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
480 ft
12 main spans
Daily traffic
100
2022 count
Owner
Local
Other Local Agency

About this bridge

N4475 over Grand River is a steel stringer/multi-beam or girder carrying N4475 over Grand River in Mayes County, Oklahoma. It was built in 1938, so it is 87 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 480 ft (146.3 m) long and 23 ft wide. If it were closed, the detour would be 9.9 mi (16 km).

Location

Open in Google Maps
CarriesN4475
CrossesGrand River
LocationN4475E0380003
RouteCounty Highway N4475
CountyMayes County
StateOklahoma
Coordinates36.46139, -95.03361
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
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure7 GoodSome minor problems.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionNovember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation2: Basically intolerable, requiring high priority of replacement
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment7: Better than present minimum criteria
Operating rating46 US tons
Inventory rating0 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckConcrete, cast-in-place
Main spans12
Design loadRailroad
Structure length480 ft (146.3 m)
Longest span40 ft (12.2 m)
Deck width23 ft (7 m)
Roadway width20 ft (6.1 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 closed9.9 mi (16 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerOther Local Agency
Maintained byOther Local 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$13.5 million
NavigationNo navigation control on waterway

Frequently asked questions

When was N4475 over Grand River built?

It was built in 1938, making it 87 years old in 2025.

What condition is N4475 over Grand River 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 November 2023.

How much traffic does N4475 over Grand River carry?

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

How long is N4475 over Grand River?

The structure is 480 ft (146.3 m) long with a longest span of 40 ft (12.2 m) and a deck 23 ft wide.

Who owns N4475 over Grand River?

It is owned by the Other Local Agency.