US Bridges

W 8th Street over Union Canal

FairPosted for load

Graham County, Arizona · 0.3 MI W JCT 20th Ave · Structure no. 08137

Built
1900
125 years old, rebuilt 2002
Condition
Fair
inspected September 2023
Type
Slab
Concrete
Length
21 ft
1 main span
Daily traffic
3,700
2022 count
Owner
County
County Highway Agency

About this bridge

W 8th Street over Union Canal is a concrete slab carrying W 8th Street over Union Canal in Graham County, Arizona. It was built in 1900 and reconstructed in 2002, so it is 125 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. Its operating status is: posted for load restriction.

It carries about 3,700 vehicles a day, roughly 5% of them trucks, projected to reach 3,710 by 2042. The structure is 21 ft (6.4 m) long and 37 ft wide. If it were closed, the detour would be 1.9 mi (3 km).

Location

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CarriesW 8th Street
CrossesUnion Canal
Location0.3 MI W JCT 20th Ave
RouteCounty Highway 0
CountyGraham County
StateArizona
Coordinates32.83139, -109.73842
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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure6 SatisfactoryStructural elements show some minor deterioration.
Channel and channel protection7 GoodSome minor problems.
Last inspectionSeptember 2023
Inspection intervalevery 24 months
Operating statusPosted for load restriction
ScourFoundations stable; scour above top of footing
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry5: Somewhat better than minimum adequacy to tolerate being left in place as is
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating28 US tons
Inventory rating16 US tons

Structure

Structure typeSlab
MaterialConcrete
DeckConcrete, cast-in-place
Main spans1
Design loadUnknown
Structure length21 ft (6.4 m)
Longest span19 ft (5.8 m)
Deck width37 ft (11.3 m)
Roadway width35 ft (10.7 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic3,700 (2022)
Projected traffic3,710 by 2042
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.9 mi (3 km)
TollOn a free road
National Highway SystemNo

Ownership and planned work

OwnerCounty Highway Agency
Maintained byCounty 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 W 8th Street over Union Canal built?

It was built in 1900, making it 125 years old in 2025. It was reconstructed in 2002.

What condition is W 8th Street over Union 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 September 2023.

How much traffic does W 8th Street over Union Canal carry?

About 3,700 vehicles per day (2022 count), of which roughly 5% are trucks.

How long is W 8th Street over Union Canal?

The structure is 21 ft (6.4 m) long with a longest span of 19 ft (5.8 m) and a deck 37 ft wide.

Who owns W 8th Street over Union Canal?

It is owned by the County Highway Agency.