US Bridges

Twin Peak Rd. over UPRR

Good

Pima County, Arizona · 10.3 MI NW JCT SR 77 · Structure no. 02891

Built
2010
15 years old
Condition
Good
inspected December 2024
Type
Box Beam or Girders - Multiple
Prestressed Concrete Continuous
Length
228 ft
3 main spans
Daily traffic
20,666
2022 count
Owner
State
State Highway Agency

About this bridge

Twin Peak Rd. over UPRR is a prestressed concrete continuous box beam or girders - multiple carrying Twin Peak Rd. over UPRR 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 228 ft (69.5 m) long and 157 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesTwin Peak Rd.
CrossesUPRR
Location10.3 MI NW JCT SR 77
RouteState Highway 10
CountyPima County
StateArizona
Coordinates32.3793, -111.109
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
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 rating83 US tons

Structure

Structure typeBox Beam or Girders - Multiple
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length228 ft (69.5 m)
Longest span76 ft (23.2 m)
Deck width157 ft (47.9 m)
Roadway width143 ft (43.6 m)
Vertical clearance over deck35 ft (10.7 m)

Traffic and service

Average daily traffic20,666 (2022)
Projected traffic20,676 by 2042
Trucks5%
Lanes on structure9
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesRailroad and waterway
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 Peak Rd. over UPRR built?

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

What condition is Twin Peak Rd. over UPRR 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 Peak Rd. over UPRR carry?

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

How long is Twin Peak Rd. over UPRR?

The structure is 228 ft (69.5 m) long with a longest span of 76 ft (23.2 m) and a deck 157 ft wide.

Who owns Twin Peak Rd. over UPRR?

It is owned by the State Highway Agency.