Alameda Corridor Engineering Team (DMJM)
Mid-Corridor Trench
MORGNER Services:
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Pre-Construction Surveys
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System Set-Up
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Property Inspections
The 20-mile-long Alameda Corridor now facilitates railroad and highway access from the San Pedro ports (Ports of Long Beach and Los Angeles) to downtown Los Angeles. The project consists of the North End, Mid-Corridor Trench, and the South End. The Mid-Corridor trench portion of the project extends some 10 miles along a depressed trainway from Santa Fe Avenue, near downtown Los Angeles, southward to State Route 91.
The depth of the trench bottom is approximately 35 to 40 feet below street grade and has a width of approximately 50 feet.
Along the west side of the depressed trainway, four lanes of two-way traffic are now in place. On the east side of the trainway, a two lane, two-way road has been constructed. In the northern portion of the mid-corridor trench, the roadways cantilever over the sides of the trench to allow for wider roads than were originally in the corridor. Local rail service, I constructed, would be at-grade along the eastern side of the mid-corridor alignment. Single span bridges were provided at 26 vehicle and two rail locations along the mid-corridor trench. The bridge crossings grade separate east-west traffic from the north-south rail traffic within the trench. Approximately 5 miles of the trench required dewatering during the construction to lower the groundwater to about 5 feet below the designed trench bottom.