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San Diego Project - Main Page
Facilities in Operation
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Storage Dams |
1 |
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Aqueducts |
225.1 mi |
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Pumping Plants |
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Storage Facilities
Lake Skinner - Auld Valley Reservoir
Carriage Facilities
San Diego Aqueduct
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Type: |
Consists principally of two parallel reinforced concrete pipelines. Includes 3.6 mi of steel pipeline (total in both pipelines), and 9.7 mi of single pipeline (full capacity) and tunnels |
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Location |
From the end of the San Jacinto Tunnel of the Colorado River Aqueduct (MWD of Southern California near San Jacinto, California, south to San Vicente Reservoir, about 15 mi northeast of San Diego, California. |
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Construction period |
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Pipeline 1 |
1945-1947 |
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Pipeline 2 |
1952-1954 |
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Length |
71.1 mi |
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Diameter |
96-48 in |
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Design capacity of the First Aqueduct -
Includes Pipelines 1 and 2 |
196 cfs |
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Second San Diego Aqueduct - Pipeline 3 - MWD Section
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Location |
Extends from the Colorado River Aqueduct, near San Jacinto, to about 6 miles inside San Diego County, the MWD point of delivery to the Authority |
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Construction period |
1957-1960 |
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Description: |
Consists of 16 miles of open canal that discharges blended Colorado River and Colorado State Water Project water into Lake Skinner and 19.3 miles of 72-in-diameter pipe from the Robert A. Skinner Filtration Plant to the Authority's delivery point |
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Length: |
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Open channel |
16 mi |
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Pipeline |
19.3 mi |
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Diameter |
72 in |
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Capacity: |
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Open canal |
500 cfs |
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Pipeline |
250 cfs |
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Second San Diego Aqueduct - Pipeline 3 - Authority's Section
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Location |
Extends from the MWD delivery point to the terminal structure at Lower Otay Reservoir. |
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Construction period |
1957-1960 |
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Description: |
The first 10.6 mi of the pipeline, extending from MWD's delivery point to the Twin Oaks Vent about 5 mi north of San Marcos, consists of 72- and 75-in-diameter steel pipe. In reaches of the pipeline where heads exceed 600 ft, the pipe was cement-mortar lined and coated. The reach of the pipe from Twin Oaks Vent to Black Mountain Vent, 18.2 mi, is 75-, 72-, 69-, and 66-in prestressed concrete pipe and cement-mortar coated and lined steel pipe |
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Total Length |
59 mi |
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MWD delivery to Twin Oaks |
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Length |
10.6 mi |
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Diameter: |
72-75 in |
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Twin Oaks to Black Mountain |
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Length |
18.2 mi |
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Diameter |
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MWD delivery to Miramar Reservoir |
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Distance |
34 mi |
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Capacity: |
250-175 cfs |
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Miramar Reservoir to Otay Reservoir |
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Distance |
25 mi |
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Capacity |
157-144 cfs |
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Second San Diego Aqueduct - Pipeline 4 - MWD's Section
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Location |
The first reach of MWD's section of Pipeline 4 starts at Lake Skinner, where it receives water either from the lake or from the end of the San Diego Canal near Auld Valley and extends 9.5 mi south to the town of Temecula. The second reach starts at a point south of U.S. Highway 395, near Temecula, and extends to the Authority's delivery point about 9.8 mi south of the Riverside-San Diego County line. |
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Construction period |
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Reach 1 |
1968-1969 |
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Reach 2 |
1969-1971 |
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Description |
The pipeline in the first reach of MWD's section consists of 9.5 mi of 99-in-inside-diameter, prestressed concrete cylinder pipeline. The second reach consists of 9.8 mi of 89-in-inside-diameter, mortar-lined and coated, welded-steel pipe. |
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Total length |
19.3 mi |
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Diameter: |
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Auld Valley to Temecula |
99 in |
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Temecula to delivery point |
88 in |
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Capacity |
380 cfs |
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Second San Diego Aqueduct - Pipeline 4 - Authority's Section
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Location |
Phase I extends from Rainbow to the Crossover Aqueduct diversion structure near San Marcos. Phase II, from the Crossover Aqueduct to Escondido Mountain. Phase III, from Escondido Mountain to Miramar Reservoir. The Pomerade Pipeline (Phase IV) includes an extension of Pipeline 4 from Miramar Reservoir to Shepherd Canyon and a section of pipeline in Shepherd Canyon to the intersection of Clairemont Mesa Boulevard and Santo Road in San Diego. |
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Construction period |
First 3 phases, 1969-1973. Phase IV extension, 1979. |
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Description |
Pipeline 4 was constructed in four phases. Phase I consists of 10.6 mi of 88-in-prestressed concrete pipe. Phase II is composed of 11.23 mi of 96-in-mortar-lined and coated, welded-steel pipe. Phase III consists of 12 mi of 96-, 72, and 69-in prestressed concrete pipe. Phase IV consists of 6.59 mi of 84-, 72-, and 54-in prestressed concrete cylinder pipe. |
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Total length |
40.4 mi |
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Diameter: |
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Phase I |
88 in |
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Phase II |
96 in |
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Phase III |
92, 72, 69 in |
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Phase IV |
84, 72, 54 in |
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