US Bridges

Kolb Road over Medium Wash

Fair

Pima County, Arizona · 0.5 MI North Sunrise Road · Structure no. 08908

Built
1985
40 years old
Condition
Fair
inspected March 2024
Type
Culvert
Concrete Continuous
Length
92 ft
6 main spans
Daily traffic
7,046
2022 count
Owner
Private
Private (other than railroad)

About this bridge

Kolb Road over Medium Wash is a concrete continuous culvert carrying Kolb Road over Medium Wash in Pima County, Arizona. It was built in 1985, so it is 40 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 7,046 vehicles a day, roughly 5% of them trucks, projected to reach 7,056 by 2042. The structure is 92 ft (28 m) long and 45 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesKolb Road
CrossesMedium Wash
Location0.5 MI North Sunrise Road
RouteCounty Highway 0
CountyPima County
StateArizona
Coordinates32.31693, -110.84857
Functional classUrban Collector

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 protection5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Culvert6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionMarch 2024
Inspection intervalevery 48 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation6: Equal to present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy5: Somewhat better than minimum adequacy to tolerate being left in place as is
Approach roadway alignment6: Equal to present minimum criteria
Operating rating78 US tons
Inventory rating47 US tons

Structure

Structure typeCulvert
MaterialConcrete Continuous
DeckNot applicable
Main spans6
Design loadHS 20
Structure length92 ft (28 m)
Longest span10 ft (3 m)
Deck width45 ft (13.8 m)
Roadway width33 ft (10.1 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic7,046 (2022)
Projected traffic7,056 by 2042
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed5 mi (8 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerPrivate (other than railroad)
Maintained byPrivate (other than railroad)
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 Medium Wash built?

It was built in 1985, making it 40 years old in 2025.

What condition is Kolb Road over Medium 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 March 2024.

How much traffic does Kolb Road over Medium Wash carry?

About 7,046 vehicles per day (2022 count), of which roughly 5% are trucks.

How long is Kolb Road over Medium Wash?

The structure is 92 ft (28 m) long with a longest span of 10 ft (3 m) and a deck 45 ft wide.

Who owns Kolb Road over Medium Wash?

It is owned by the Private (other than railroad).