US Bridges

IRR US 163 over Wash

Good

Navajo County, Arizona · 9.7 MI N JCT US 160 · Structure no. 06476

Built
1958
67 years old
Condition
Good
inspected September 2024
Type
Culvert
Steel
Length
45 ft
5 main spans
Daily traffic
1,998
2022 count
Owner
State
State Highway Agency

About this bridge

IRR US 163 over Wash is a steel culvert carrying IRR US 163 over Wash in Navajo County, Arizona. It was built in 1958, so it is 67 years old, older 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 1,998 vehicles a day, roughly 13% of them trucks, projected to reach 2,008 by 2042. The structure is 45 ft (13.7 m) long. If it were closed, the detour would be 57.8 mi (93 km).

Location

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CarriesIRR US 163
CrossesWash
Location9.7 MI N JCT US 160
RouteU.S. Route 163
CountyNavajo County
StateArizona
Coordinates36.8331, -110.2469
Functional classRural Major Collector

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 protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionSeptember 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating99 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans5
Design loadHS 20
Structure length45 ft (13.7 m)
Longest span5 ft (1.5 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,998 (2022)
Projected traffic2,008 by 2042
Trucks13%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed57.8 mi (93 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
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 US 163 over Wash built?

It was built in 1958, making it 67 years old in 2025.

What condition is IRR US 163 over 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 September 2024.

How much traffic does IRR US 163 over Wash carry?

About 1,998 vehicles per day (2022 count), of which roughly 13% are trucks.

How long is IRR US 163 over Wash?

The structure is 45 ft (13.7 m) long with a longest span of 5 ft (1.5 m).

Who owns IRR US 163 over Wash?

It is owned by the State Highway Agency.