US Bridges

IRR BIA RTE N15 over Dilkon Well Wash

Good

Navajo County, Arizona · 1 MI E of JCT N15 & N16 · Structure no. 00000000000N681

Built
1986
39 years old
Condition
Good
inspected March 2023
Type
Culvert
Steel
Length
22 ft
1 main span
Daily traffic
2,051
2023 count
Owner
Federal
Bureau of Indian Affairs

About this bridge

IRR BIA RTE N15 over Dilkon Well Wash is a steel culvert carrying IRR BIA RTE N15 over Dilkon Well Wash in Navajo County, Arizona. It was built in 1986, so it is 39 years old, younger than the Arizona average of 47.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 2,051 vehicles a day, roughly 10% of them trucks, projected to reach 2,400 by 2043. The structure is 22 ft (6.8 m) long and 137 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

CarriesIRR BIA RTE N15
CrossesDilkon Well Wash
Location1 MI E of JCT N15 & N16
RouteFederal Lands Road 0N15
StateArizona
Coordinates35.38739, -110.31267
Functional classRural Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Culvert7 GoodSome minor problems.
Last inspectionMarch 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating48 US tons
Inventory rating36 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans1
Design loadHS 20
Structure length22 ft (6.8 m)
Longest span22 ft (6.8 m)
Deck width137 ft (41.7 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,051 (2023)
Projected traffic2,400 by 2043
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 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 N15 over Dilkon Well Wash built?

It was built in 1986, making it 39 years old in 2025.

What condition is IRR BIA RTE N15 over Dilkon Well Wash in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in March 2023.

How much traffic does IRR BIA RTE N15 over Dilkon Well Wash carry?

About 2,051 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is IRR BIA RTE N15 over Dilkon Well Wash?

The structure is 22 ft (6.8 m) long with a longest span of 22 ft (6.8 m) and a deck 137 ft wide.

Who owns IRR BIA RTE N15 over Dilkon Well Wash?

It is owned by the Bureau of Indian Affairs.