US Bridges

Forrester RD (S30) over Westside Main Canal

Poor

Imperial County, California · 0.6 MI N/O Keystone RD · Structure no. 58C0014

Built
1950
75 years old
Condition
Poor
inspected December 2023
Type
Stringer/Multi-beam or Girder
Steel Continuous
Length
118 ft
4 main spans
Daily traffic
11,714
2016 count
Owner
County
County Highway Agency

About this bridge

Forrester RD (S30) over Westside Main Canal is a steel continuous stringer/multi-beam or girder carrying Forrester RD (S30) 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 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 11,714 vehicles a day, roughly 31% of them trucks, projected to reach 16,344 by 2045. The structure is 118 ft (36 m) long and 28 ft wide. If it were closed, the detour would be 18 mi (29 km).

Location

Open in Google Maps
CarriesForrester RD (S30)
CrossesWestside Main Canal
Location0.6 MI N/O Keystone RD
RouteCounty Highway 0
CountyImperial County
StateCalifornia
Coordinates32.92284, -115.62135
Functional classRural Principal Arterial - Other

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
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure4 PoorAdvanced section loss, deterioration, spalling or scour.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionDecember 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation4: Meets minimum tolerable limits to be left in place as is
Deck geometry2: Basically intolerable, requiring high priority of replacement
Waterway adequacy9: Superior to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating81 US tons
Inventory rating48.6 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialSteel Continuous
DeckConcrete, cast-in-place
Main spans4
Design loadHS 20
Structure length118 ft (36 m)
Longest span28 ft (8.5 m)
Deck width28 ft (8.5 m)
Roadway width26 ft (7.9 m)
Vertical clearance over deckUnrestricted

Traffic and service

Average daily traffic11,714 (2016)
Projected traffic16,344 by 2045
Trucks31%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed18 mi (29 km)
TollOn a free road
National Highway SystemYes

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$1.2 million (2020 estimate)
NavigationNo navigation control on waterway

Frequently asked questions

When was Forrester RD (S30) over Westside Main Canal built?

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

What condition is Forrester RD (S30) over Westside Main 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 December 2023.

How much traffic does Forrester RD (S30) over Westside Main Canal carry?

About 11,714 vehicles per day (2016 count), of which roughly 31% are trucks.

How long is Forrester RD (S30) over Westside Main Canal?

The structure is 118 ft (36 m) long with a longest span of 28 ft (8.5 m) and a deck 28 ft wide.

Who owns Forrester RD (S30) over Westside Main Canal?

It is owned by the County Highway Agency.