US Bridges

SR 99 over Canyon Diablo Wash

Fair

Coconino County, Arizona · 19.2 MI N JCT I-40 · Structure no. 02184

Built
1985
40 years old
Condition
Fair
inspected August 2024
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
222 ft
4 main spans
Daily traffic
748
2022 count
Owner
State
State Highway Agency

About this bridge

SR 99 over Canyon Diablo Wash is a steel continuous stringer/multi-beam or girder carrying SR 99 over Canyon Diablo Wash in Coconino County, Arizona. It was built in 1985, so it is 40 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 748 vehicles a day, roughly 7% of them trucks, projected to reach 758 by 2042. The structure is 222 ft (67.7 m) long and 37 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesSR 99
CrossesCanyon Diablo Wash
Location19.2 MI N JCT I-40
RouteState Highway 99
CountyCoconino County
StateArizona
Coordinates35.2948, -110.9911
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
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 inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourCountermeasures installed to correct a previously existing problem
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating65 US tons
Inventory rating38 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length222 ft (67.7 m)
Longest span55 ft (16.8 m)
Deck width37 ft (11.3 m)
Roadway width34 ft (10.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic748 (2022)
Projected traffic758 by 2042
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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was SR 99 over Canyon Diablo Wash built?

It was built in 1985, making it 40 years old in 2025.

What condition is SR 99 over Canyon Diablo 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 August 2024.

How much traffic does SR 99 over Canyon Diablo Wash carry?

About 748 vehicles per day (2022 count), of which roughly 7% are trucks.

How long is SR 99 over Canyon Diablo Wash?

The structure is 222 ft (67.7 m) long with a longest span of 55 ft (16.8 m) and a deck 37 ft wide.

Who owns SR 99 over Canyon Diablo Wash?

It is owned by the State Highway Agency.