US Bridges

SR 366 over Wet Canyon

Fair

Graham County, Arizona · 9.6 MI SW JCT US 191 · Structure no. 20054

Built
2012
13 years old
Condition
Fair
inspected August 2023
Type
Box Beam or Girders - Single or Spread
Concrete
Length
60 ft
1 main span
Daily traffic
675
2022 count
Owner
State
State Highway Agency

About this bridge

SR 366 over Wet Canyon is a concrete box beam or girders - single or spread carrying SR 366 over Wet Canyon in Graham County, Arizona. It was built in 2012, so it is 13 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 675 vehicles a day, roughly 21% of them trucks, projected to reach 685 by 2042. The structure is 60 ft (18.3 m) long and 34 ft wide. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesSR 366
CrossesWet Canyon
Location9.6 MI SW JCT US 191
RouteState Highway 366
CountyGraham County
StateArizona
Coordinates32.65132, -109.8128
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.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating94 US tons
Inventory rating56 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadHL 93
Structure length60 ft (18.3 m)
Longest span57 ft (17.4 m)
Deck width34 ft (10.4 m)
Roadway width31 ft (9.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic675 (2022)
Projected traffic685 by 2042
Trucks21%
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 366 over Wet Canyon built?

It was built in 2012, making it 13 years old in 2025.

What condition is SR 366 over Wet Canyon 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 2023.

How much traffic does SR 366 over Wet Canyon carry?

About 675 vehicles per day (2022 count), of which roughly 21% are trucks.

How long is SR 366 over Wet Canyon?

The structure is 60 ft (18.3 m) long with a longest span of 57 ft (17.4 m) and a deck 34 ft wide.

Who owns SR 366 over Wet Canyon?

It is owned by the State Highway Agency.