US Bridges

Kolb Road over I-10

Fair

Pima County, Arizona · 10.2 MI E JCT I-19 · Structure no. 01823

Built
1986
39 years old
Condition
Fair
inspected January 2024
Type
Stringer/Multi-beam or Girder
Prestressed Concrete Continuous
Length
279 ft
2 main spans
Daily traffic
6,759
2022 count
Owner
State
State Highway Agency

About this bridge

Kolb Road over I-10 is a prestressed concrete continuous stringer/multi-beam or girder carrying Kolb Road over I-10 in Pima 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 6,759 vehicles a day, roughly 10% of them trucks, projected to reach 6,769 by 2042. The structure is 279 ft (85 m) long and 79 ft wide. If it were closed, the detour would be 6.8 mi (11 km).

Location

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CarriesKolb Road
CrossesI-10
Location10.2 MI E JCT I-19
RouteCounty Highway 0
CountyPima County
StateArizona
Coordinates32.1035, -110.841
Functional classUrban Other Principal Arterial

Condition and inspection

Fair

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

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure7 GoodSome minor problems.
Last inspectionJanuary 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourBridge not over waterway
Structural evaluation6: Equal to present minimum criteria
Deck geometry9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating99 US tons
Inventory rating56 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialPrestressed Concrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length279 ft (85 m)
Longest span136 ft (41.5 m)
Deck width79 ft (24.1 m)
Roadway width76 ft (23.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic6,759 (2022)
Projected traffic6,769 by 2042
Trucks10%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesHighway
Detour if closed6.8 mi (11 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 Kolb Road over I-10 built?

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

What condition is Kolb Road over I-10 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 January 2024.

How much traffic does Kolb Road over I-10 carry?

About 6,759 vehicles per day (2022 count), of which roughly 10% are trucks.

How long is Kolb Road over I-10?

The structure is 279 ft (85 m) long with a longest span of 136 ft (41.5 m) and a deck 79 ft wide.

Who owns Kolb Road over I-10?

It is owned by the State Highway Agency.