US Bridges

Kolb Road over Julian Wash

Fair

Pima County, Arizona · 0.8 MI N of I 10 · Structure no. 08744

Built
1984
41 years old
Condition
Fair
inspected November 2023
Type
Culvert
Concrete Continuous
Length
64 ft
6 main spans
Daily traffic
10,250
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

Kolb Road over Julian Wash is a concrete continuous culvert carrying Kolb Road over Julian Wash in Pima County, Arizona. It was built in 1984, so it is 41 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 10,250 vehicles a day, projected to reach 10,260 by 2042. The structure is 64 ft (19.5 m) long. If it were closed, the detour would be 3.7 mi (6 km).

Location

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CarriesKolb Road
CrossesJulian Wash
Location0.8 MI N of I 10
RouteCounty Highway 0
CountyPima County
StateArizona
Coordinates32.11526, -110.84106
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
Channel and channel protection7 GoodSome minor problems.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionNovember 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Waterway adequacy6: Equal to present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating110.1 US tons
Inventory rating110.1 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans6
Design loadHS 20
Structure length64 ft (19.5 m)
Longest span10 ft (3 m)
Deck width0 ft (0 m)
Roadway width0 ft (0 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic10,250 (2022)
Projected traffic10,260 by 2042
Trucks0%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.7 mi (6 km)
TollOn a free road
National Highway SystemYes

Ownership and planned work

OwnerCity or Municipal Highway Agency
Maintained byCity or Municipal 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 Kolb Road over Julian Wash built?

It was built in 1984, making it 41 years old in 2025.

What condition is Kolb Road over Julian Wash 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 November 2023.

How much traffic does Kolb Road over Julian Wash carry?

About 10,250 vehicles per day (2022 count).

How long is Kolb Road over Julian Wash?

The structure is 64 ft (19.5 m) long with a longest span of 10 ft (3 m).

Who owns Kolb Road over Julian Wash?

It is owned by the City or Municipal Highway Agency.