US Bridges

SR 186 over Walnut Canyon

Good

Cochise County, Arizona · 17.2 MI W JCT SR 181 · Structure no. 05096

Built
1957
68 years old
Condition
Good
inspected May 2021
Type
Culvert
Concrete Continuous
Length
74 ft
6 main spans
Daily traffic
231
2019 count
Owner
State
State Highway Agency

About this bridge

SR 186 over Walnut Canyon is a concrete continuous culvert carrying SR 186 over Walnut Canyon in Cochise County, Arizona. It was built in 1957, so it is 68 years old, older than the Arizona average of 47.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 231 vehicles a day, roughly 10% of them trucks, projected to reach 241 by 2039. The structure is 74 ft (22.6 m) long and 41 ft wide. If it were closed, the detour would be 75.2 mi (121 km).

Location

Open in Google Maps
CarriesSR 186
CrossesWalnut Canyon
Location17.2 MI W JCT SR 181
RouteState Highway 186
CountyCochise County
StateArizona
Coordinates32.1774, -109.6257
Functional classRural Minor Arterial

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionMay 2021
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating57 US tons
Inventory rating34 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans6
Design loadHS 20
Structure length74 ft (22.6 m)
Longest span10 ft (3 m)
Deck width41 ft (12.6 m)
Roadway width38 ft (11.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic231 (2019)
Projected traffic241 by 2039
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed75.2 mi (121 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 186 over Walnut Canyon built?

It was built in 1957, making it 68 years old in 2025.

What condition is SR 186 over Walnut Canyon in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in May 2021.

How much traffic does SR 186 over Walnut Canyon carry?

About 231 vehicles per day (2019 count), of which roughly 10% are trucks.

How long is SR 186 over Walnut Canyon?

The structure is 74 ft (22.6 m) long with a longest span of 10 ft (3 m) and a deck 41 ft wide.

Who owns SR 186 over Walnut Canyon?

It is owned by the State Highway Agency.