US Bridges

SR 77 over Cottonwood Wash

Good

Navajo County, Arizona · 0.7 MI N JCT SR 277 · Structure no. 02430

Built
1994
31 years old
Condition
Good
inspected June 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
307 ft
3 main spans
Daily traffic
4,015
2021 count
Owner
State
State Highway Agency

About this bridge

SR 77 over Cottonwood Wash is a prestressed concrete continuous stringer/multi-beam or girder carrying SR 77 over Cottonwood Wash in Navajo County, Arizona. It was built in 1994, so it is 31 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 4,015 vehicles a day, roughly 8% of them trucks, projected to reach 4,025 by 2041. The structure is 307 ft (93.6 m) long and 54 ft wide. If it were closed, the detour would be 34.8 mi (56 km).

Location

Open in Google Maps
CarriesSR 77
CrossesCottonwood Wash
Location0.7 MI N JCT SR 277
RouteState Highway 77
CountyNavajo County
StateArizona
Coordinates34.5218, -110.0797
Functional classUrban Other Principal Arterial

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJune 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating58 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length307 ft (93.6 m)
Longest span101 ft (30.8 m)
Deck width54 ft (16.5 m)
Roadway width44 ft (13.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,015 (2021)
Projected traffic4,025 by 2041
Trucks8%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed34.8 mi (56 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 77 over Cottonwood Wash built?

It was built in 1994, making it 31 years old in 2025.

What condition is SR 77 over Cottonwood 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 June 2023.

How much traffic does SR 77 over Cottonwood Wash carry?

About 4,015 vehicles per day (2021 count), of which roughly 8% are trucks.

How long is SR 77 over Cottonwood Wash?

The structure is 307 ft (93.6 m) long with a longest span of 101 ft (30.8 m) and a deck 54 ft wide.

Who owns SR 77 over Cottonwood Wash?

It is owned by the State Highway Agency.