US Bridges

Onion Saddle over Cave Creek

Good

Cochise County, Arizona · 4.7 MI Sw/O Portal Fire & · Structure no. 030501000003261

Built
1957
68 years old
Condition
Good
inspected August 2024
Type
Slab
Concrete
Length
46 ft
2 main spans
Daily traffic
95
2022 count
Owner
Federal
U.S. Forest Service

About this bridge

Onion Saddle over Cave Creek is a concrete slab carrying Onion Saddle over Cave Creek 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 95 vehicles a day, projected to reach 150 by 2042. The structure is 46 ft (14.1 m) long and 30 ft wide. If it were closed, the detour would be 24.9 mi (40 km).

CarriesOnion Saddle
CrossesCave Creek
Location4.7 MI Sw/O Portal Fire &
RouteFederal Lands Road 42
StateArizona
Coordinates31.88164, -109.19752
Functional classRural Local

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionAugust 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
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 rating39.7 US tons
Inventory rating30.3 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length46 ft (14.1 m)
Longest span22 ft (6.7 m)
Deck width30 ft (9.2 m)
Roadway width24 ft (7.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic95 (2022)
Projected traffic150 by 2042
Trucks—
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed24.9 mi (40 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerU.S. Forest Service
Maintained byU.S. Forest Service
Historic statusHistorical significance not determinable at this time
Work proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$350,000
NavigationNo navigation control on waterway

Frequently asked questions

When was Onion Saddle over Cave Creek built?

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

What condition is Onion Saddle over Cave Creek 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 August 2024.

How much traffic does Onion Saddle over Cave Creek carry?

About 95 vehicles per day (2022 count).

How long is Onion Saddle over Cave Creek?

The structure is 46 ft (14.1 m) long with a longest span of 22 ft (6.7 m) and a deck 30 ft wide.

Who owns Onion Saddle over Cave Creek?

It is owned by the U.S. Forest Service.