US Bridges

Kolb Road over E. Branch of Alamo Wash

Good

Pima County, Arizona · 0.5 MI S JCT 22nd ST · Structure no. 09348

Built
1974
51 years old, rebuilt 1984
Condition
Good
inspected October 2021
Type
Culvert
Concrete Continuous
Length
21 ft
2 main spans
Daily traffic
30,466
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

Kolb Road over E. Branch of Alamo Wash is a concrete continuous culvert carrying Kolb Road over E. Branch of Alamo Wash in Pima County, Arizona. It was built in 1974 and reconstructed in 1984, so it is 51 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 30,466 vehicles a day, roughly 10% of them trucks, projected to reach 30,476 by 2040. The structure is 21 ft (6.4 m) long and 119 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesKolb Road
CrossesE. Branch of Alamo Wash
Location0.5 MI S JCT 22nd ST
RouteCity Street 0
CountyPima County
StateArizona
Coordinates32.1986, -110.841
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
Channel and channel protection7 GoodSome minor problems.
Culvert7 GoodSome minor problems.
Last inspectionOctober 2021
Inspection intervalevery 48 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 adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating58 US tons
Inventory rating35.1 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans2
Design loadHS 20
Structure length21 ft (6.4 m)
Longest span10 ft (3 m)
Deck width119 ft (36.3 m)
Roadway width100 ft (30.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30,466 (2020)
Projected traffic30,476 by 2040
Trucks10%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 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 E. Branch of Alamo Wash built?

It was built in 1974, making it 51 years old in 2025. It was reconstructed in 1984.

What condition is Kolb Road over E. Branch of Alamo Wash 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 October 2021.

How much traffic does Kolb Road over E. Branch of Alamo Wash carry?

About 30,466 vehicles per day (2020 count), of which roughly 10% are trucks.

How long is Kolb Road over E. Branch of Alamo Wash?

The structure is 21 ft (6.4 m) long with a longest span of 10 ft (3 m) and a deck 119 ft wide.

Who owns Kolb Road over E. Branch of Alamo Wash?

It is owned by the City or Municipal Highway Agency.