US Bridges

IRR N4670 over Warren Branch

Fair

Ottawa County, Oklahoma · 10E 2.5N of Miami · Structure no. 312610000000000

Built
2017
8 years old
Condition
Fair
inspected September 2023
Type
Culvert
Concrete
Length
53 ft
3 main spans
Daily traffic
100
2022 count
Owner
County
County Highway Agency

About this bridge

IRR N4670 over Warren Branch is a concrete culvert carrying IRR N4670 over Warren Branch in Ottawa County, Oklahoma. It was built in 2017, so it is 8 years old, younger 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 100 vehicles a day, roughly 15% of them trucks, projected to reach 160 by 2042. The structure is 53 ft (16.2 m) long. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesIRR N4670
CrossesWarren Branch
Location10E 2.5N of Miami
RouteCounty Highway N4670
CountyOttawa County
StateOklahoma
Coordinates36.90184, -94.67123
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
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating75 US tons

Structure

Structure typeCulvert
MaterialConcrete
DeckNot applicable
Main spans3
Design loadHS 20
Structure length53 ft (16.2 m)
Longest span16 ft (4.9 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic100 (2022)
Projected traffic160 by 2042
Trucks15%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 proposedNone recorded
Estimated improvement cost$225,000
NavigationNo navigation control on waterway

Frequently asked questions

When was IRR N4670 over Warren Branch built?

It was built in 2017, making it 8 years old in 2025.

What condition is IRR N4670 over Warren Branch 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 September 2023.

How much traffic does IRR N4670 over Warren Branch carry?

About 100 vehicles per day (2022 count), of which roughly 15% are trucks.

How long is IRR N4670 over Warren Branch?

The structure is 53 ft (16.2 m) long with a longest span of 16 ft (4.9 m).

Who owns IRR N4670 over Warren Branch?

It is owned by the County Highway Agency.