US Bridges

SR 87 over Cottonwood Basin

Fair

Maricopa County, Arizona · 12.7 MI S JCT SR 188 · Structure no. 02298

Built
1998
27 years old
Condition
Fair
inspected July 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
270 ft
3 main spans
Daily traffic
15,072
2024 count
Owner
State
State Highway Agency

About this bridge

SR 87 over Cottonwood Basin is a prestressed concrete continuous stringer/multi-beam or girder carrying SR 87 over Cottonwood Basin in Maricopa County, Arizona. It was built in 1998, so it is 27 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 15,072 vehicles a day, roughly 11% of them trucks, projected to reach 15,082 by 2042. The structure is 270 ft (82.3 m) long and 86 ft wide. If it were closed, the detour would be 83.9 mi (135 km).

Location

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CarriesSR 87
CrossesCottonwood Basin
Location12.7 MI S JCT SR 188
RouteState Highway 87
CountyMaricopa County
StateArizona
Coordinates33.9259, -111.4477
Functional classRural Principal Arterial - Other

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJuly 2024
Inspection intervalevery 24 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 adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating38 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length270 ft (82.3 m)
Longest span89 ft (27.1 m)
Deck width86 ft (26.2 m)
Roadway width80 ft (24.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic15,072 (2024)
Projected traffic15,082 by 2042
Trucks11%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed83.9 mi (135 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 87 over Cottonwood Basin built?

It was built in 1998, making it 27 years old in 2025.

What condition is SR 87 over Cottonwood Basin 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 July 2024.

How much traffic does SR 87 over Cottonwood Basin carry?

About 15,072 vehicles per day (2024 count), of which roughly 11% are trucks.

How long is SR 87 over Cottonwood Basin?

The structure is 270 ft (82.3 m) long with a longest span of 89 ft (27.1 m) and a deck 86 ft wide.

Who owns SR 87 over Cottonwood Basin?

It is owned by the State Highway Agency.