US Bridges

SR 266 over Stockton Pass

Fair

Graham County, Arizona · 7.2 MI W JCT US 191 · Structure no. 06188

Built
1961
64 years old
Condition
Fair
inspected July 2023
Type
Culvert
Concrete Continuous
Length
75 ft
6 main spans
Daily traffic
225
2021 count
Owner
State
State Highway Agency

About this bridge

SR 266 over Stockton Pass is a concrete continuous culvert carrying SR 266 over Stockton Pass in Graham County, Arizona. It was built in 1961, so it is 64 years old, older 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 225 vehicles a day, roughly 20% of them trucks, projected to reach 235 by 2041. The structure is 75 ft (22.9 m) long. If it were closed, the detour would be 98.8 mi (159 km).

Location

Open in Google Maps
CarriesSR 266
CrossesStockton Pass
Location7.2 MI W JCT US 191
RouteState Highway 266
CountyGraham County
StateArizona
Coordinates32.56187, -109.79141
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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJuly 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating84 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans6
Design loadHS 20
Structure length75 ft (22.9 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 traffic225 (2021)
Projected traffic235 by 2041
Trucks20%
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 266 over Stockton Pass built?

It was built in 1961, making it 64 years old in 2025.

What condition is SR 266 over Stockton Pass 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 July 2023.

How much traffic does SR 266 over Stockton Pass carry?

About 225 vehicles per day (2021 count), of which roughly 20% are trucks.

How long is SR 266 over Stockton Pass?

The structure is 75 ft (22.9 m) long with a longest span of 10 ft (3 m).

Who owns SR 266 over Stockton Pass?

It is owned by the State Highway Agency.