US Bridges

IRR BIA RTE N4 over Cottonwood Wash

Fair

Apache County, Arizona · 15 Miles West HWY 191 · Structure no. 0000N35780B0551

Built
2010
15 years old
Condition
Fair
inspected March 2023
Type
Culvert
Steel
Length
26 ft
2 main spans
Daily traffic
4,035
2023 count
Owner
Federal
Bureau of Indian Affairs

About this bridge

IRR BIA RTE N4 over Cottonwood Wash is a steel culvert carrying IRR BIA RTE N4 over Cottonwood Wash in Apache County, Arizona. It was built in 2010, so it is 15 years old, younger than the Arizona 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 4,035 vehicles a day, roughly 10% of them trucks, projected to reach 4,721 by 2043. The structure is 26 ft (8 m) long and 115 ft wide. If it were closed, the detour would be 8.1 mi (13 km).

Location

Open in Google Maps
CarriesIRR BIA RTE N4
CrossesCottonwood Wash
Location15 Miles West HWY 191
RouteFederal Lands Road 0N4
CountyApache County
StateArizona
Coordinates36.07356, -109.88722
Functional classRural Minor Arterial

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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy4: Meets minimum tolerable limits to be left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99.9 US tons
Inventory rating99.9 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans2
Design loadUnknown
Structure length26 ft (8 m)
Longest span12 ft (3.6 m)
Deck width115 ft (35 m)
Roadway width38 ft (11.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,035 (2023)
Projected traffic4,721 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed8.1 mi (13 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerBureau of Indian Affairs
Maintained byBureau of Indian Affairs
Historic statusNot eligible for the National Register of Historic Places
Work proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was IRR BIA RTE N4 over Cottonwood Wash built?

It was built in 2010, making it 15 years old in 2025.

What condition is IRR BIA RTE N4 over Cottonwood Wash 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 March 2023.

How much traffic does IRR BIA RTE N4 over Cottonwood Wash carry?

About 4,035 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is IRR BIA RTE N4 over Cottonwood Wash?

The structure is 26 ft (8 m) long with a longest span of 12 ft (3.6 m) and a deck 115 ft wide.

Who owns IRR BIA RTE N4 over Cottonwood Wash?

It is owned by the Bureau of Indian Affairs.