US Bridges

Osborn Road over Grand Canal

Fair

Maricopa County, Arizona · 0.22 MI W of 20th Street · Structure no. 09312

Built
1950
75 years old, rebuilt 1965
Condition
Fair
inspected January 2023
Type
Slab
Concrete Continuous
Length
56 ft
3 main spans
Daily traffic
30,152
2021 count
Owner
City
City or Municipal Highway Agency

About this bridge

Osborn Road over Grand Canal is a concrete continuous slab carrying Osborn Road over Grand Canal in Maricopa County, Arizona. It was built in 1950 and reconstructed in 1965, so it is 75 years old, older 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 30,152 vehicles a day, roughly 1% of them trucks, projected to reach 30,162 by 2041. The structure is 56 ft (17.1 m) long and 64 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesOsborn Road
CrossesGrand Canal
Location0.22 MI W of 20th Street
RouteCity Street 0
CountyMaricopa County
StateArizona
Coordinates33.4875, -112.0429
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure6 SatisfactoryStructural elements show some minor deterioration.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionJanuary 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating34.5 US tons
Inventory rating20.6 US tons

Structure

Structure typeSlab
MaterialConcrete Continuous
DeckConcrete, cast-in-place
Main spans3
Design loadHS 20
Structure length56 ft (17.1 m)
Longest span21 ft (6.4 m)
Deck width64 ft (19.4 m)
Roadway width50 ft (15.2 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic30,152 (2021)
Projected traffic30,162 by 2041
Trucks1%
Lanes on structure4
Traffic directionTwo-way traffic
CarriesHighway and pedestrian
CrossesWaterway
Detour if closed3.1 mi (5 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 proposedDeck rehabilitation with only incidental widening
Estimated improvement cost$1,000 (2021 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Osborn Road over Grand Canal built?

It was built in 1950, making it 75 years old in 2025. It was reconstructed in 1965.

What condition is Osborn Road over Grand Canal 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 2023.

How much traffic does Osborn Road over Grand Canal carry?

About 30,152 vehicles per day (2021 count), of which roughly 1% are trucks.

How long is Osborn Road over Grand Canal?

The structure is 56 ft (17.1 m) long with a longest span of 21 ft (6.4 m) and a deck 64 ft wide.

Who owns Osborn Road over Grand Canal?

It is owned by the City or Municipal Highway Agency.