SR 186 over Boulder Canyon

Fair

Cochise County, Arizona · 18.8 MI W JCT SR 181 · Structure no. 05095

Built: 1957; 68 years old
Condition: Fair; 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 Boulder Canyon is a concrete continuous culvert carrying SR 186 over Boulder 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 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 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

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CarriesSR 186

CrossesBoulder Canyon

Location18.8 MI W JCT SR 181

RouteState Highway 186

CountyCochise County

StateArizona

Coordinates32.1841, -109.6506

Functional classRural Minor Arterial

Condition and inspection

Fair

The lowest-rated primary component is rated 5 or 6. Minor deterioration is present but the structure is sound.

Component	Rating	Meaning
Channel and channel protection	7 Good	Some minor problems.
Culvert	6 Satisfactory	Structural elements show some minor deterioration.

Last inspectionMay 2021

Inspection intervalevery 48 months

Operating statusOpen, no restriction

ScourFoundations stable; scour above top of footing

Structural evaluation6: Equal to present minimum criteria

Deck geometry9: Superior to present desirable criteria

Waterway adequacy8: Equal to present desirable criteria

Approach roadway alignment6: Equal to present minimum criteria

Operating rating54 US tons

Inventory rating32 US tons

Structure

Structure typeCulvert

MaterialConcrete Continuous

DeckConcrete, cast-in-place

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 (11.6 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 Boulder Canyon built?

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

What condition is SR 186 over Boulder 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 May 2021.

How much traffic does SR 186 over Boulder Canyon carry?

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

How long is SR 186 over Boulder 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 Boulder Canyon?

It is owned by the State Highway Agency.