US Bridges

IRR US 163 over Wash

Fair

Navajo County, Arizona · 5.5 MI N JCT US 160 · Structure no. 06475

Built
1958
67 years old
Condition
Fair
inspected September 2022
Type
Culvert
Steel
Length
42 ft
5 main spans
Daily traffic
3,152
2017 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 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 3,152 vehicles a day, roughly 7% of them trucks, projected to reach 3,162 by 2038. The structure is 42 ft (12.8 m) long. If it were closed, the detour would be 98.8 mi (159 km).

Location

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CarriesIRR US 163
CrossesWash
Location5.5 MI N JCT US 160
RouteU.S. Route 163
CountyNavajo County
StateArizona
Coordinates36.7746, -110.2288
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 inspectionSeptember 2022
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating72 US tons
Inventory rating43 US tons

Structure

Structure typeCulvert
MaterialSteel
DeckNot applicable
Main spans5
Design loadHS 20
Structure length42 ft (12.8 m)
Longest span6 ft (1.8 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,152 (2017)
Projected traffic3,162 by 2038
Trucks7%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed98.8 mi (159 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1,000 (2022 estimate)
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 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 September 2022.

How much traffic does IRR US 163 over Wash carry?

About 3,152 vehicles per day (2017 count), of which roughly 7% are trucks.

How long is IRR US 163 over Wash?

The structure is 42 ft (12.8 m) long with a longest span of 6 ft (1.8 m).

Who owns IRR US 163 over Wash?

It is owned by the State Highway Agency.