US Bridges

IRR BIA RTE N12 over Damon Wash

Fair

Apache County, Arizona · 3 MI N of Window Rock Az · Structure no. 00000000000N677

Built
1979
46 years old
Condition
Fair
inspected March 2023
Type
Culvert
Concrete Continuous
Length
26 ft
4 main spans
Daily traffic
10,000
2023 count
Owner
Federal
Bureau of Indian Affairs

About this bridge

IRR BIA RTE N12 over Damon Wash is a concrete continuous culvert carrying IRR BIA RTE N12 over Damon Wash in Apache County, Arizona. It was built in 1979, so it is 46 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 10,000 vehicles a day, roughly 10% of them trucks, projected to reach 11,700 by 2040. The structure is 26 ft (7.9 m) long and 105 ft wide. If it were closed, the detour would be 6.2 mi (10 km).

Location

Open in Google Maps
CarriesIRR BIA RTE N12
CrossesDamon Wash
Location3 MI N of Window Rock Az
RouteFederal Lands Road 0N12
CountyApache County
StateArizona
Coordinates35.69214, -109.06481
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 protection7 GoodSome minor problems.
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 geometry9: Superior to present desirable criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans4
Design loadHS 20
Structure length26 ft (7.9 m)
Longest span6 ft (1.8 m)
Deck width105 ft (31.9 m)
Roadway width82 ft (25.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,000 (2023)
Projected traffic11,700 by 2040
Trucks10%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed6.2 mi (10 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 N12 over Damon Wash built?

It was built in 1979, making it 46 years old in 2025.

What condition is IRR BIA RTE N12 over Damon 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 N12 over Damon Wash carry?

About 10,000 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is IRR BIA RTE N12 over Damon Wash?

The structure is 26 ft (7.9 m) long with a longest span of 6 ft (1.8 m) and a deck 105 ft wide.

Who owns IRR BIA RTE N12 over Damon Wash?

It is owned by the Bureau of Indian Affairs.