US Bridges

Selma Highway over Casa Grande Canal Ext

PoorPosted for load

Pinal County, Arizona · 0.1 MI E JCT SR 87 · Structure no. 08436

Built
1900
125 years old
Condition
Poor
inspected March 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
32 ft
2 main spans
Daily traffic
450
2020 count
Owner
City
City or Municipal Highway Agency

About this bridge

Selma Highway over Casa Grande Canal Ext is a wood or timber stringer/multi-beam or girder carrying Selma Highway over Casa Grande Canal Ext in Pinal 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. Its operating status is: posted for load restriction.

It carries about 450 vehicles a day, roughly 5% of them trucks, projected to reach 460 by 2040. The structure is 32 ft (9.8 m) long and 23 ft wide. If it were closed, the detour would be 5 mi (8 km).

Location

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CarriesSelma Highway
CrossesCasa Grande Canal Ext
Location0.1 MI E JCT SR 87
RouteCity Street 0
CountyPinal County
StateArizona
Coordinates32.8505, -111.5139
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
Deck6 SatisfactoryStructural elements show some minor deterioration.
Superstructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection7 GoodSome minor problems.
Last inspectionMarch 2024
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 geometry3: Basically intolerable, requiring high priority of corrective action
Waterway adequacy7: Better than present minimum criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating31 US tons
Inventory rating22 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans2
Design loadUnknown
Structure length32 ft (9.8 m)
Longest span15 ft (4.6 m)
Deck width23 ft (6.9 m)
Roadway width21 ft (6.4 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic450 (2020)
Projected traffic460 by 2040
Trucks5%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed5 mi (8 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 proposedReplacement because of substandard load-carrying capacity or roadway geometry
Estimated improvement cost$1,000 (2024 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Selma Highway over Casa Grande Canal Ext built?

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

What condition is Selma Highway over Casa Grande Canal Ext 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 March 2024.

How much traffic does Selma Highway over Casa Grande Canal Ext carry?

About 450 vehicles per day (2020 count), of which roughly 5% are trucks.

How long is Selma Highway over Casa Grande Canal Ext?

The structure is 32 ft (9.8 m) long with a longest span of 15 ft (4.6 m) and a deck 23 ft wide.

Who owns Selma Highway over Casa Grande Canal Ext?

It is owned by the City or Municipal Highway Agency.