US Bridges

Helmet Peak Road over Large Wash

Good

Pima County, Arizona · 1.3 MI West of I 19 · Structure no. 08632

Built
1977
48 years old
Condition
Good
inspected November 2023
Type
Culvert
Concrete Continuous
Length
75 ft
5 main spans
Daily traffic
2,509
2023 count
Owner
County
County Highway Agency

About this bridge

Helmet Peak Road over Large Wash is a concrete continuous culvert carrying Helmet Peak Road over Large Wash in Pima County, Arizona. It was built in 1977, so it is 48 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 2,509 vehicles a day, roughly 10% of them trucks, projected to reach 2,519 by 2042. The structure is 75 ft (22.9 m) long and 54 ft wide. If it were closed, the detour would be 14.9 mi (24 km).

Location

Open in Google Maps
CarriesHelmet Peak Road
CrossesLarge Wash
Location1.3 MI West of I 19
RouteCounty Highway 0
CountyPima County
StateArizona
Coordinates31.95772, -111.00957
Functional classRural Major Collector

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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert7 GoodSome minor problems.
Last inspectionNovember 2023
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 adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment8: Equal to present desirable criteria
Operating rating56 US tons
Inventory rating33 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans5
Design loadHS 20
Structure length75 ft (22.9 m)
Longest span10 ft (3 m)
Deck width54 ft (16.5 m)
Roadway width53 ft (16.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic2,509 (2023)
Projected traffic2,519 by 2042
Trucks10%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed14.9 mi (24 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 Helmet Peak Road over Large Wash built?

It was built in 1977, making it 48 years old in 2025.

What condition is Helmet Peak Road over Large Wash 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 November 2023.

How much traffic does Helmet Peak Road over Large Wash carry?

About 2,509 vehicles per day (2023 count), of which roughly 10% are trucks.

How long is Helmet Peak Road over Large Wash?

The structure is 75 ft (22.9 m) long with a longest span of 10 ft (3 m) and a deck 54 ft wide.

Who owns Helmet Peak Road over Large Wash?

It is owned by the County Highway Agency.