US Bridges

Layton RD over Union Canal

Poor

Graham County, Arizona · 0.1 MI W JCT Webster RD · Structure no. 08135

Built
1900
125 years old
Condition
Poor
inspected September 2023
Type
Stringer/Multi-beam or Girder
Steel
Length
24 ft
1 main span
Daily traffic
203
2022 count
Owner
County
County Highway Agency

About this bridge

Layton RD over Union Canal is a steel stringer/multi-beam or girder carrying Layton RD over Union Canal in Graham County, Arizona. It was built in 1900, 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 poor condition with a lowest component rating of 4 out of 9. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

It carries about 203 vehicles a day, roughly 1% of them trucks, projected to reach 213 by 2042. The structure is 24 ft (7.3 m) long and 37 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesLayton RD
CrossesUnion Canal
Location0.1 MI W JCT Webster RD
RouteCounty Highway 0
CountyGraham County
StateArizona
Coordinates32.8506, -109.7855
Functional classRural Local

Condition and inspection

Poor

The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions.

ComponentRatingMeaning
Deck5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection6 SatisfactoryStructural elements show some minor deterioration.
Last inspectionSeptember 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 geometry7: Better than present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating36 US tons
Inventory rating26 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel
DeckSteel plate
Main spans1
Design loadUnknown
Structure length24 ft (7.3 m)
Longest span22 ft (6.7 m)
Deck width37 ft (11.4 m)
Roadway width37 ft (11.2 m)
Vertical clearance over deck16 ft (4.9 m)

Traffic and service

Average daily traffic203 (2022)
Projected traffic213 by 2042
Trucks1%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed1.2 mi (2 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1,000 (2023 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Layton RD over Union Canal built?

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

What condition is Layton RD over Union Canal in?

The National Bridge Inventory rates it in poor condition. The lowest-rated primary component is rated 4 or below, indicating advanced deterioration. Poor does not mean unsafe; such bridges are inspected more often and may carry load restrictions. The last reported inspection was in September 2023.

How much traffic does Layton RD over Union Canal carry?

About 203 vehicles per day (2022 count), of which roughly 1% are trucks.

How long is Layton RD over Union Canal?

The structure is 24 ft (7.3 m) long with a longest span of 22 ft (6.7 m) and a deck 37 ft wide.

Who owns Layton RD over Union Canal?

It is owned by the County Highway Agency.