US Bridges

Forest RD over Large Wash

Fair

Maricopa County, Arizona · 1.3 MI N/ Mcdowell Mtn RD · Structure no. 10366

Built
1999
26 years old
Condition
Fair
inspected January 2025
Type
Culvert
Concrete Continuous
Length
65 ft
6 main spans
Daily traffic
4,509
2023 count
Owner
County
County Highway Agency

About this bridge

Forest RD over Large Wash is a concrete continuous culvert carrying Forest RD over Large Wash in Maricopa County, Arizona. It was built in 1999, so it is 26 years old, younger 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 4,509 vehicles a day, roughly 5% of them trucks, projected to reach 4,519 by 2042. The structure is 65 ft (19.8 m) long and 42 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesForest RD
CrossesLarge Wash
Location1.3 MI N/ Mcdowell Mtn RD
RouteCounty Highway 0
CountyMaricopa County
StateArizona
Coordinates33.72883, -111.67196
Functional classRural Major Collector

Condition and inspection

Fair

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

ComponentRatingMeaning
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionJanuary 2025
Inspection intervalevery 36 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating77.4 US tons
Inventory rating46.3 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans6
Design loadHS 20
Structure length65 ft (19.8 m)
Longest span10 ft (3 m)
Deck width42 ft (12.8 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic4,509 (2023)
Projected traffic4,519 by 2042
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 Forest RD over Large Wash built?

It was built in 1999, making it 26 years old in 2025.

What condition is Forest RD over Large Wash 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 January 2025.

How much traffic does Forest RD over Large Wash carry?

About 4,509 vehicles per day (2023 count), of which roughly 5% are trucks.

How long is Forest RD over Large Wash?

The structure is 65 ft (19.8 m) long with a longest span of 10 ft (3 m) and a deck 42 ft wide.

Who owns Forest RD over Large Wash?

It is owned by the County Highway Agency.