US Bridges

SR 77 over Wash

Fair

Navajo County, Arizona · 15.8 MI N JCT US 60 · Structure no. 04408

Built
1941
84 years old, rebuilt 1974
Condition
Fair
inspected March 2021
Type
Culvert
Concrete Continuous
Length
74 ft
6 main spans
Daily traffic
13,087
2020 count
Owner
State
State Highway Agency

About this bridge

SR 77 over Wash is a concrete continuous culvert carrying SR 77 over Wash in Navajo County, Arizona. It was built in 1941 and reconstructed in 1974, so it is 84 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 13,087 vehicles a day, roughly 9% of them trucks, projected to reach 12,097 by 2040. The structure is 74 ft (22.6 m) long. If it were closed, the detour would be 49.1 mi (79 km).

Location

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CarriesSR 77
CrossesWash
Location15.8 MI N JCT US 60
RouteState Highway 77
CountyNavajo County
StateArizona
Coordinates34.4702, -110.0902
Functional classUrban Other Principal 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 2021
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 rating99 US tons
Inventory rating88 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans6
Design loadHS 20
Structure length74 ft (22.6 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic13,087 (2020)
Projected traffic12,097 by 2040
Trucks9%
Lanes on structure5
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed49.1 mi (79 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerState Highway Agency
Maintained byState Highway Agency
Historic statusNot eligible for the National Register of Historic Places
Work proposedWidening of existing bridge without deck rehabilitation
Estimated improvement cost$1,000 (2021 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 77 over Wash built?

It was built in 1941, making it 84 years old in 2025. It was reconstructed in 1974.

What condition is SR 77 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 March 2021.

How much traffic does SR 77 over Wash carry?

About 13,087 vehicles per day (2020 count), of which roughly 9% are trucks.

How long is SR 77 over Wash?

The structure is 74 ft (22.6 m) long with a longest span of 10 ft (3 m).

Who owns SR 77 over Wash?

It is owned by the State Highway Agency.