US Bridges

Happy Valley Road over Trilby Wash

Good

Maricopa County, Arizona · 0.7 MI E of Dysart RD · Structure no. 11006

Built
2006
19 years old
Condition
Good
inspected December 2022
Type
Culvert
Concrete Continuous
Length
105 ft
8 main spans
Daily traffic
5,507
2020 count
Owner
County
County Highway Agency

About this bridge

Happy Valley Road over Trilby Wash is a concrete continuous culvert carrying Happy Valley Road over Trilby Wash in Maricopa County, Arizona. It was built in 2006, so it is 19 years old, younger 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 5,507 vehicles a day, roughly 2% of them trucks, projected to reach 5,517 by 2040. The structure is 105 ft (32 m) long. If it were closed, the detour would be 3.7 mi (6 km).

Location

Open in Google Maps
CarriesHappy Valley Road
CrossesTrilby Wash
Location0.7 MI E of Dysart RD
RouteCounty Highway 0
CountyMaricopa County
StateArizona
Coordinates33.71324, -112.33124
Functional classUrban 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 protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionDecember 2022
Inspection intervalevery 36 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating110.1 US tons
Inventory rating110.1 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans8
Design loadHS 20
Structure length105 ft (32 m)
Longest span12 ft (3.7 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,507 (2020)
Projected traffic5,517 by 2040
Trucks2%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 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 Happy Valley Road over Trilby Wash built?

It was built in 2006, making it 19 years old in 2025.

What condition is Happy Valley Road over Trilby 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 December 2022.

How much traffic does Happy Valley Road over Trilby Wash carry?

About 5,507 vehicles per day (2020 count), of which roughly 2% are trucks.

How long is Happy Valley Road over Trilby Wash?

The structure is 105 ft (32 m) long with a longest span of 12 ft (3.7 m).

Who owns Happy Valley Road over Trilby Wash?

It is owned by the County Highway Agency.