US Bridges

Kolb Road over Rose Hill Wash

Good

Pima County, Arizona · Kolb RD at Timrod · Structure no. 07541

Built
1980
45 years old
Condition
Good
inspected December 2023
Type
Culvert
Concrete Continuous
Length
20 ft
2 main spans
Daily traffic
11,412
2022 count
Owner
City
City or Municipal Highway Agency

About this bridge

Kolb Road over Rose Hill Wash is a concrete continuous culvert carrying Kolb Road over Rose Hill Wash in Pima County, Arizona. It was built in 1980, so it is 45 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 11,412 vehicles a day, roughly 4% of them trucks, projected to reach 11,432 by 2042. The structure is 20 ft (6.1 m) long. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesKolb Road
CrossesRose Hill Wash
LocationKolb RD at Timrod
RouteCity Street 0
CountyPima County
StateArizona
Coordinates32.2159, -110.8409
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 inspectionDecember 2023
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation7: Better than present minimum criteria
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating82 US tons
Inventory rating49.1 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans2
Design loadHS 20
Structure length20 ft (6.1 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 traffic11,412 (2022)
Projected traffic11,432 by 2042
Trucks4%
Lanes on structure6
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed1.2 mi (2 km)
TollOn a free road
National Highway SystemNo

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 Rose Hill Wash built?

It was built in 1980, making it 45 years old in 2025.

What condition is Kolb Road over Rose Hill 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 December 2023.

How much traffic does Kolb Road over Rose Hill Wash carry?

About 11,412 vehicles per day (2022 count), of which roughly 4% are trucks.

How long is Kolb Road over Rose Hill Wash?

The structure is 20 ft (6.1 m) long with a longest span of 10 ft (3 m).

Who owns Kolb Road over Rose Hill Wash?

It is owned by the City or Municipal Highway Agency.