US Bridges

SR 77 over Little Colorado River

Fair

Navajo County, Arizona · 0.4 MI N JCT US 180 · Structure no. 02030

Built
1988
37 years old
Condition
Fair
inspected May 2023
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
1,729 ft
17 main spans
Daily traffic
1,064
2021 count
Owner
State
State Highway Agency

About this bridge

SR 77 over Little Colorado River is a prestressed concrete continuous stringer/multi-beam or girder carrying SR 77 over Little Colorado River in Navajo County, Arizona. It was built in 1988, so it is 37 years old, younger 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 1,064 vehicles a day, roughly 7% of them trucks, projected to reach 1,074 by 2041. The structure is 1,729 ft (527 m) long and 62 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesSR 77
CrossesLittle Colorado River
Location0.4 MI N JCT US 180
RouteState Highway 77
CountyNavajo County
StateArizona
Coordinates34.8941, -110.16
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMay 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating61.9 US tons
Inventory rating36 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans17
Design loadHS 20
Structure length1,729 ft (527 m)
Longest span102 ft (31.1 m)
Deck width62 ft (18.9 m)
Roadway width52 ft (15.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic1,064 (2021)
Projected traffic1,074 by 2041
Trucks7%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway and waterway
Detour if closed98.8 mi (159 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$9,000 (2023 estimate)
NavigationNot applicable (no waterway)

Frequently asked questions

When was SR 77 over Little Colorado River built?

It was built in 1988, making it 37 years old in 2025.

What condition is SR 77 over Little Colorado River 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 May 2023.

How much traffic does SR 77 over Little Colorado River carry?

About 1,064 vehicles per day (2021 count), of which roughly 7% are trucks.

How long is SR 77 over Little Colorado River?

The structure is 1,729 ft (527 m) long with a longest span of 102 ft (31.1 m) and a deck 62 ft wide.

Who owns SR 77 over Little Colorado River?

It is owned by the State Highway Agency.