US Bridges

IRR BIA RTE N12 over Chl Hoo Tso Wash

Fair

Apache County, Arizona · 1 MI South of Az HWY 264 · Structure no. 00000000000N676

Built
1965
60 years old, rebuilt 1995
Condition
Fair
inspected March 2023
Type
Culvert
Steel
Length
57 ft
3 main spans
Daily traffic
8,973
2023 count
Owner
Federal
Bureau of Indian Affairs

About this bridge

IRR BIA RTE N12 over Chl Hoo Tso Wash is a steel culvert carrying IRR BIA RTE N12 over Chl Hoo Tso Wash in Apache County, Arizona. It was built in 1965 and reconstructed in 1995, so it is 60 years old, older 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 8,973 vehicles a day, roughly 10% of them trucks, projected to reach 6,988 by 2040. The structure is 57 ft (17.4 m) long and 134 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

Open in Google Maps
CarriesIRR BIA RTE N12
CrossesChl Hoo Tso Wash
Location1 MI South of Az HWY 264
RouteFederal Lands Road 0N12
CountyApache County
StateArizona
Coordinates35.64422, -109.09281
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 protection8 Very GoodNo problems noted.
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 geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48 US tons
Inventory rating35.8 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans3
Design loadHS 20
Structure length57 ft (17.4 m)
Longest span14 ft (4.4 m)
Deck width134 ft (40.8 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic8,973 (2023)
Projected traffic6,988 by 2040
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 Chl Hoo Tso Wash built?

It was built in 1965, making it 60 years old in 2025. It was reconstructed in 1995.

What condition is IRR BIA RTE N12 over Chl Hoo Tso 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 Chl Hoo Tso Wash carry?

About 8,973 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is IRR BIA RTE N12 over Chl Hoo Tso Wash?

The structure is 57 ft (17.4 m) long with a longest span of 14 ft (4.4 m) and a deck 134 ft wide.

Who owns IRR BIA RTE N12 over Chl Hoo Tso Wash?

It is owned by the Bureau of Indian Affairs.