US Bridges

Swarthout RD over Westside Main Canal

Fair

Imperial County, California · 0.2 MI S/O Edgar RD · Structure no. 58C0177

Built
1950
75 years old
Condition
Fair
inspected December 2024
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
91 ft
6 main spans
Daily traffic
66
2022 count
Owner
County
County Highway Agency

About this bridge

Swarthout RD over Westside Main Canal is a wood or timber stringer/multi-beam or girder carrying Swarthout RD over Westside Main Canal in Imperial County, California. It was built in 1950, so it is 75 years old, older than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in fair condition with a lowest component rating of 5 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 66 vehicles a day, roughly 1% of them trucks, projected to reach 84 by 2042. The structure is 91 ft (27.7 m) long and 26 ft wide. If it were closed, the detour would be 1.2 mi (2 km).

Location

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CarriesSwarthout RD
CrossesWestside Main Canal
Location0.2 MI S/O Edgar RD
CountyImperial County
StateCalifornia
Coordinates32.88657, -115.63142
Functional classRural Minor 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.
Substructure5 FairAll primary structural elements are sound but may have minor section loss, cracking, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionDecember 2024
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation5: Somewhat better than minimum adequacy to tolerate being left in place as is
Deck geometry6: Equal to present minimum criteria
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment6: Equal to present minimum criteria
Operating rating31.7 US tons
Inventory rating22.2 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans6
Design loadUnknown
Structure length91 ft (27.7 m)
Longest span15 ft (4.6 m)
Deck width26 ft (7.9 m)
Roadway width25 ft (7.5 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic66 (2022)
Projected traffic84 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 proposedNone recorded
Estimated improvement cost—
NavigationNo navigation control on waterway

Frequently asked questions

When was Swarthout RD over Westside Main Canal built?

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

What condition is Swarthout RD over Westside Main 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 December 2024.

How much traffic does Swarthout RD over Westside Main Canal carry?

About 66 vehicles per day (2022 count), of which roughly 1% are trucks.

How long is Swarthout RD over Westside Main Canal?

The structure is 91 ft (27.7 m) long with a longest span of 15 ft (4.6 m) and a deck 26 ft wide.

Who owns Swarthout RD over Westside Main Canal?

It is owned by the County Highway Agency.