US Bridges

Twin Peaks Rd. over I-10

Good

Pima County, Arizona · 10.3 MI NW JCT SR 77 · Structure no. 02890

Built
2010
15 years old
Condition
Good
inspected December 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete
Length
218 ft
2 main spans
Daily traffic
20,666
2022 count
Owner
State
State Highway Agency

About this bridge

Twin Peaks Rd. over I-10 is a prestressed concrete stringer/multi-beam or girder carrying Twin Peaks Rd. over I-10 in Pima 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 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 20,666 vehicles a day, roughly 5% of them trucks, projected to reach 20,676 by 2042. The structure is 218 ft (66.4 m) long and 156 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesTwin Peaks Rd.
CrossesI-10
Location10.3 MI NW JCT SR 77
RouteCity Street 0
CountyPima County
StateArizona
Coordinates32.3788, -111.1099
Functional classUrban Minor Arterial

Condition and inspection

Good

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure8 Very GoodNo problems noted.
Substructure7 GoodSome minor problems.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating46 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length218 ft (66.4 m)
Longest span106 ft (32.3 m)
Deck width156 ft (47.5 m)
Roadway width142 ft (43.3 m)
Vertical clearance over deck30 ft (9.1 m)

Traffic and service

Average daily traffic20,666 (2022)
Projected traffic20,676 by 2042
Trucks5%
Lanes on structure10
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesHighway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was Twin Peaks Rd. over I-10 built?

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

What condition is Twin Peaks Rd. over I-10 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 2024.

How much traffic does Twin Peaks Rd. over I-10 carry?

About 20,666 vehicles per day (2022 count), of which roughly 5% are trucks.

How long is Twin Peaks Rd. over I-10?

The structure is 218 ft (66.4 m) long with a longest span of 106 ft (32.3 m) and a deck 156 ft wide.

Who owns Twin Peaks Rd. over I-10?

It is owned by the State Highway Agency.