US Bridges

SR 85; Ramp C over I 10

Good

Maricopa County, Arizona · JCT SR 85 · Structure no. 01726

Built
1976
49 years old
Condition
Good
inspected February 2023
Type
Box Beam or Girders - Single or Spread
Prestressed Concrete Continuous
Length
280 ft
2 main spans
Daily traffic
3,770
2021 count
Owner
State
State Highway Agency

About this bridge

SR 85; Ramp C over I 10 is a prestressed concrete continuous box beam or girders - single or spread carrying SR 85; Ramp C over I 10 in Maricopa County, Arizona. It was built in 1976, so it is 49 years old, older 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 3,770 vehicles a day, roughly 23% of them trucks, projected to reach 3,780 by 2041. The structure is 280 ft (85.3 m) long and 29 ft wide. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesSR 85; Ramp C
CrossesI 10
LocationJCT SR 85
RouteState Highway 85
CountyMaricopa County
StateArizona
Coordinates33.4277, -112.6233
Functional classUrban Other Principal 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.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Last inspectionFebruary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation7: Better than present minimum criteria
Deck geometry8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating82 US tons
Inventory rating36 US tons

Structure

Structure typeBox Beam or Girders - Single or Spread
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length280 ft (85.3 m)
Longest span148 ft (45.1 m)
Deck width29 ft (8.7 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,770 (2021)
Projected traffic3,780 by 2041
Trucks23%
Lanes on structure1
Traffic directionOne-way traffic
CarriesHighway
CrossesHighway
Detour if closed3.7 mi (6 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—
NavigationNot applicable (no waterway)

Frequently asked questions

When was SR 85; Ramp C over I 10 built?

It was built in 1976, making it 49 years old in 2025.

What condition is SR 85; Ramp C 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 February 2023.

How much traffic does SR 85; Ramp C over I 10 carry?

About 3,770 vehicles per day (2021 count), of which roughly 23% are trucks.

How long is SR 85; Ramp C over I 10?

The structure is 280 ft (85.3 m) long with a longest span of 148 ft (45.1 m) and a deck 29 ft wide.

Who owns SR 85; Ramp C over I 10?

It is owned by the State Highway Agency.