US Bridges

I-8 WB over Santa Rosa Cap Canal

Fair

Pinal County, Arizona · 17.7 MI W JCT I-10 · Structure no. 01437

Built
1986
39 years old
Condition
Fair
inspected March 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
62 ft
1 main span
Daily traffic
3,567
2022 count
Owner
State
State Highway Agency

About this bridge

I-8 WB over Santa Rosa Cap Canal is a prestressed concrete stringer/multi-beam or girder carrying I-8 WB over Santa Rosa Cap Canal in Pinal County, Arizona. It was built in 1986, so it is 39 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 3,567 vehicles a day, roughly 50% of them trucks, projected to reach 3,577 by 2042. The structure is 62 ft (18.9 m) long and 46 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesI-8 WB
CrossesSanta Rosa Cap Canal
Location17.7 MI W JCT I-10
RouteInterstate 8
CountyPinal County
StateArizona
Coordinates32.8288, -111.98
Functional classRural Principal Arterial - Interstate

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 protection8 Very GoodNo problems noted.
Last inspectionMarch 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Deck geometry8: Equal to present desirable criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating69 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans1
Design loadHS 20
Structure length62 ft (18.9 m)
Longest span60 ft (18.3 m)
Deck width46 ft (13.9 m)
Roadway width42 ft (12.8 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,567 (2022)
Projected traffic3,577 by 2042
Trucks50%
Lanes on structure2
Traffic directionOne-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemYes
Strategic Highway NetworkInterstate STRAHNET route

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 I-8 WB over Santa Rosa Cap Canal built?

It was built in 1986, making it 39 years old in 2025.

What condition is I-8 WB over Santa Rosa Cap Canal 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 March 2024.

How much traffic does I-8 WB over Santa Rosa Cap Canal carry?

About 3,567 vehicles per day (2022 count), of which roughly 50% are trucks.

How long is I-8 WB over Santa Rosa Cap Canal?

The structure is 62 ft (18.9 m) long with a longest span of 60 ft (18.3 m) and a deck 46 ft wide.

Who owns I-8 WB over Santa Rosa Cap Canal?

It is owned by the State Highway Agency.