US Bridges

SR 303L over Twin Buttes Wash

Good

Maricopa County, Arizona · 6.9 MI N JCT US 60 · Structure no. 02905

Built
2010
15 years old
Condition
Good
inspected February 2025
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
144 ft
1 main span
Daily traffic
5,994
2022 count
Owner
State
State Highway Agency

About this bridge

SR 303L over Twin Buttes Wash is a prestressed concrete stringer/multi-beam or girder carrying SR 303L over Twin Buttes Wash in Maricopa County, Arizona. It was built in 2010, so it is 15 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 8 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 5,994 vehicles a day, roughly 7% of them trucks, projected to reach 6,004 by 2042. The structure is 144 ft (43.9 m) long and 73 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesSR 303L
CrossesTwin Buttes Wash
Location6.9 MI N JCT US 60
RouteState Highway 303
CountyMaricopa County
StateArizona
Coordinates33.72006, -112.30966
Functional classUrban Principal Arterial - Other Freeway or Expressway

Condition and inspection

Good

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

ComponentRatingMeaning
Deck8 Very GoodNo problems noted.
Superstructure8 Very GoodNo problems noted.
Substructure8 Very GoodNo problems noted.
Channel and channel protection7 GoodSome minor problems.
Last inspectionFebruary 2025
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation8: Equal to present desirable criteria
Deck geometry9: Superior to present desirable criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating41 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 25 or greater
Structure length144 ft (43.9 m)
Longest span135 ft (41.1 m)
Deck width73 ft (22.2 m)
Roadway width70 ft (21.3 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic5,994 (2022)
Projected traffic6,004 by 2042
Trucks7%
Lanes on structure3
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes

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 303L over Twin Buttes Wash built?

It was built in 2010, making it 15 years old in 2025.

What condition is SR 303L over Twin Buttes 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 February 2025.

How much traffic does SR 303L over Twin Buttes Wash carry?

About 5,994 vehicles per day (2022 count), of which roughly 7% are trucks.

How long is SR 303L over Twin Buttes Wash?

The structure is 144 ft (43.9 m) long with a longest span of 135 ft (41.1 m) and a deck 73 ft wide.

Who owns SR 303L over Twin Buttes Wash?

It is owned by the State Highway Agency.