US Bridges

SR 64 over Red Lake Wash

Poor

Coconino County, Arizona · 8.4 MI N JCT I 40 · Structure no. 04179

Built
1936
89 years old, rebuilt 1946
Condition
Poor
inspected August 2024
Type
Culvert
Concrete Continuous
Length
54 ft
5 main spans
Daily traffic
4,618
2020 count
Owner
State
State Highway Agency

About this bridge

SR 64 over Red Lake Wash is a concrete continuous culvert carrying SR 64 over Red Lake Wash in Coconino County, Arizona. It was built in 1936 and reconstructed in 1946, so it is 89 years old, older than the Arizona average of 47.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 4,618 vehicles a day, roughly 20% of them trucks, projected to reach 4,628 by 2040. The structure is 54 ft (16.5 m) long. If it were closed, the detour would be 51 mi (82 km).

Location

Open in Google Maps
CarriesSR 64
CrossesRed Lake Wash
Location8.4 MI N JCT I 40
RouteState Highway 64
CountyCoconino County
StateArizona
Coordinates35.3733, -112.1629
Functional classRural Principal Arterial - Other

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert4 PoorAdvanced section loss, deterioration, spalling or scour.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: 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 rating66 US tons
Inventory rating39 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans5
Design loadHS 20
Structure length54 ft (16.5 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 traffic4,618 (2020)
Projected traffic4,628 by 2040
Trucks20%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed51 mi (82 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—
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 64 over Red Lake Wash built?

It was built in 1936, making it 89 years old in 2025. It was reconstructed in 1946.

What condition is SR 64 over Red Lake Wash in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in August 2024.

How much traffic does SR 64 over Red Lake Wash carry?

About 4,618 vehicles per day (2020 count), of which roughly 20% are trucks.

How long is SR 64 over Red Lake Wash?

The structure is 54 ft (16.5 m) long with a longest span of 10 ft (3 m).

Who owns SR 64 over Red Lake Wash?

It is owned by the State Highway Agency.