US Bridges

Ross RD over Reservation Main Drain

Good

Imperial County, California · 0.85 MI E/O Picacho RD · Structure no. 58C0084

Built
1940
85 years old, rebuilt 2017
Condition
Good
inspected October 2023
Type
Stringer/Multi-beam or Girder
Wood or Timber
Length
92 ft
6 main spans
Daily traffic
1,650
2023 count
Owner
County
County Highway Agency

About this bridge

Ross RD over Reservation Main Drain is a wood or timber stringer/multi-beam or girder carrying Ross RD over Reservation Main Drain in Imperial County, California. It was built in 1940 and reconstructed in 2017, so it is 85 years old, older than the California average of 54.8 years.

The most recent inspection reported to the Federal Highway Administration rates it in good condition with a lowest component rating of 7 out of 9. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

It carries about 1,650 vehicles a day, roughly 2% of them trucks, projected to reach 1,930 by 2045. The structure is 92 ft (28 m) long and 26 ft wide. If it were closed, the detour would be 3.1 mi (5 km).

Location

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CarriesRoss RD
CrossesReservation Main Drain
Location0.85 MI E/O Picacho RD
RouteCounty Highway 0
CountyImperial County
StateCalifornia
Coordinates32.78177, -114.60187
Functional classRural Major Collector

Condition and inspection

Good

All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted.

ComponentRatingMeaning
Deck7 GoodSome minor problems.
Superstructure7 GoodSome minor problems.
Substructure7 GoodSome minor problems.
Channel and channel protection8 Very GoodNo problems noted.
Last inspectionOctober 2023
Inspection intervalevery 24 months
Operating statusOpen, no restriction
ScourFoundations stable; scour within limits of footing or piles
Structural evaluation7: Better than present minimum criteria
Deck geometry4: Meets minimum tolerable limits to be left in place as is
Waterway adequacy8: Equal to present desirable criteria
Approach roadway alignment8: Equal to present desirable criteria
Operating rating58.5 US tons
Inventory rating42.5 US tons

Structure

Structure typeStringer/Multi-beam or Girder
MaterialWood or Timber
DeckWood or timber
Main spans6
Design loadUnknown
Structure length92 ft (28 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 traffic1,650 (2023)
Projected traffic1,930 by 2045
Trucks2%
Lanes on structure2
Traffic directionTwo-way traffic
CarriesHighway
CrossesWaterway
Detour if closed3.1 mi (5 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 Ross RD over Reservation Main Drain built?

It was built in 1940, making it 85 years old in 2025. It was reconstructed in 2017.

What condition is Ross RD over Reservation Main Drain in?

The National Bridge Inventory rates it in good condition. All primary components (deck, superstructure, substructure, or culvert) are rated 7 or higher. No significant problems were noted. The last reported inspection was in October 2023.

How much traffic does Ross RD over Reservation Main Drain carry?

About 1,650 vehicles per day (2023 count), of which roughly 2% are trucks.

How long is Ross RD over Reservation Main Drain?

The structure is 92 ft (28 m) long with a longest span of 15 ft (4.6 m) and a deck 26 ft wide.

Who owns Ross RD over Reservation Main Drain?

It is owned by the County Highway Agency.