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Boulder Canyon Project - All-American Canal System
All American Canal System (BCP) | Project History | Project Data | Contact Information

Project Data



Project Water Supply

Current Conditions


Yuma Area Office (Arizona) Flow Data
Streamflow Forecast Map

Spring and Summer (NRCS)
Snowpack Information

Mountain Snowpack Maps for Colorado River Basin
Drought Index

Palmer Drought Index Map
Explanation of Palmer Drought Severity Index (Text)


Historic Conditions

Annual Precipitation
Normal3.17 in
Maximum - 19896.75 in
Minimum - 19661.01 in
Yuma, Arizona 1961-1990 


Mean Annual74.4 ?F
Daily Maximum - 07/28/1995124 ?F
Daily Minimum - 02/18/19955 ?F
Yuma, Arizona 1948-1996 
Growing Season365 days
Elevation of irrigable area-229 to 75 ft


Colorado River
Drainage area at Imperial Dammi2
Annual discharge: 



Colorado River below Imperial Dam, California-Arizona (USGS)


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Project Water Quality

Imperial Reservoir

Lower Colorado

Salton Sea

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Facilities in Operation
Storage Facilities
Diversion Facilities
Carriage Facilities
Pumping Plants
Power Facilities




Facilities in Operation
Storage Dams1
Diversion Dams1
Canals203 mi
Laterals463 mi
Coachella Distribution System495 mi
Imperial Distribution System1,474 mi
Pumping Plants16
Coachella16.0 mi
Imperial1,454.5 mi


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Storage Facilities

Hoover Dam

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Diversion Facilities

Imperial Dam
TypeConcrete slab and buttress, ogee weir
LocationColorado River, 18 miles northeast of Yuma, Arizona
Construction period1936-1938
Structure height, overflow section31 ft
Structural Height, nonoverflow section85 ft
Hydraulic height23 ft
Base width of weir76 ft
Crest Width, nonoverflow section12 ft
Crest Length, overflow section1,198 ft
Total Length3,475 ft
Crest Elevation, overflow section181.0 ft
Crest Elevation, nonoverflow section196.3 ft
Volume196,800 yd3
SpillwayOverflow ogee weir
Overflow capacity at 191.0 ft180,000 cfs


All-American Canal Headworks
TypeConcrete-lined channel 360 feet wide, controlled by four 75- by 23-ft roller gates. Downstream from the gates, four channels direct water into the desilting basins
LocationAdjacent to California abutment
Construction period 
Diversion capacity15,155 cfs
SluicewayConcrete-lined channel, bottom width ranges from 241.5 to 216 feet, controlled by twelve 16- by 8-feet radial gates
At elevation 191.0 ft42,500 cfs
At elevation 179.5 ft31,000 cfs


Gila Gravity Main Canal Headworks
TypeConcrete-lined channel controlled by three 35.67- by 14.5-ft radial gates
LocationAdjacent to Arizona abutment
Construction period 
Diversion Capacity2,200 cfs
RoadwayService bridge consists of a concrete deck carried by 4 plate girder spans 91.5 ft long overall and 76 ft between bearings. The single lane has design load of 20 tons. Maintenance bridge consists of eight 37 ft spans supported on concrete pile bents with concrete caps


All-American Canal Desilting Works

Adjacent to the All-American Canal Headworks, three desilting basins are laid off at an angle of 60 degrees from the intake canal and each is divided into half by a long V-shaped influent channel. The dimensions of each half-basin are 269 ft wide by 769 ft long. Each basin is designed to handle a maximum of 2,000 cfs and each pair of basins is fed by an influent channel. Twelve rotating scraper mechanisms are installed in each half-basin to collect and remove the silt that settles out of the water. The water depth is 12.5 ft. The velocity of water is about 0.25 ft/s. Silt deposited in the basins during the passage of water from influent to effluent channels is removed by means of 72 rotary-type scrapers, each 125 ft in diameter, which force the deposited silt into collecting trenches from which it is flushed into a system of sludge disposal pipes, to the sluiceway channel, and then into the Laguna Settling Basin about 2 mi south of Imperial Dam.

The designed desilting capacity at a canal discharge rate of 12,000 cfs equals 70,000 tons per day; 600,000 to 700,000 yd? of sediment are removed annually.

Gila Canal Desilting Works, Gila Gravity Main Canal

The Gila Canal Headworks were constructed at the Arizona end of Imperial Dam. Downstream from this structure, the desilting works for the Gila Gravity Main Canal were installed. The Gila desilting works consists of one concrete-lined basin with space allowed for the construction of two additional basins. This basin was designed for desilting a maximum flow of 2,200 cfs. It is formed by two levees extending perpendicularly to the axis of Imperial Dam on either side of the third gate structure of the Gila Canal Headworks. The basin is roughly 1,175 ft long, including inlet and outlet transitions. The bottom width ranges from about 115 to 104 ft between the transitions. The average depth of water is about 20 ft, and the average velocity is 0.66 ft/s. Flow from The basin is controlled by two sets of eight 7- by 16-ft fixed wheel gates, one set located above the other. The upper eight are for diverting and the lower eight are used during sluicing operations. The sluicing water is returned to the river by a curved channel 1,800 ft long. The Gila Canal desilting works are capable of removing about 8,130 tons per day.

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Carriage Facilities
All-American Canal - Imperial Division
LocationFrom Imperial Dam west-southwest about 80 miles to the vicinity of Calexico, California
Construction period1934-1940
Length80 mi
Diversion capacity15,155 cfs
Typical section (earth lined): 
Bottom width160 ft
Side slopes1.75:1
Water depth21 ft
Lining:Compacted clay on bottom; loose clay on sides
Bottom thickness4 in
Side thickness6 in


New River Siphon - All-American Canal
LocationAt the New River, about 2 miles west of Calexico, California
Construction period1937-1938
DescriptionTwin barrels welded 0.5-in thick, plate-steel pipes on reinforced concrete piers resting on reinforced concrete pile footings
Length of siphon374 ft
Diameter each barrel15.5 ft
Capacity2,700 cfs
Distribution system:1 
Main canals235.5 mi
Open channel224.1 mi
Concrete lined11.4 mi
Lateral canals1,472.1 mi
Open channel686.6 mi
Concrete lined776.7 mi
Pipeline8.8 mi


1 Constructed and operated by the Imperial Irrigation District

Coachella Canal
LocationFrom Drop No. 1 on All-American Canal, about 18 miles west of Yuma, Arizona, northwest to vicinity of Indio, California
Construction period1938-1948
Length123 mi
Diversion capacity2,500 cfs
Typical section, earth lined: 
Bottom width40-60 ft
Side slopes2:1
Water depth10.3 ft
Lining, clay-blanket12 in
Typical section, concrete lined: 
Bottom width12 ft
Side slopes1.5 :1
Water depth10.8 ft
Lining thickness3.5 in


Coachella Canal Replacement
Distribution system, underground concrete pipe. Pipe sizes range from 1 to 7 feet in diameter495 mi


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Pumping Plants
DesignationNumber of unitsTotal capacity, cfsTotal dynamic head, feetTotal horsepower
Major Pumping Plants    
Pumping Plant L-1316.845120
Pumping Plant L-243937230
Pumping Plant L-3    
High Lift312.632.5 
Low Lift1317 
Pumping Plant L-4446.840300
Pumping Plant L-5636.935-37160
High Lift315.637 
Low Lift31535 
Pumping Plant L-6293750
Coachella 0-122138120
Coachella 0-2264240
Relift Pumping Plants    
Lateral 113.01311 
Lateral 114.3139 
Lateral 114.8137 
Lateral 115.31310.5 
Wistaria No. 12207.8 
Wistaria No. 22203.04 
Woodbine Canal192.74 
West Side152.75 


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Power Facilities

The Imperial Irrigation District has constructed powerplants at Pilot Knot Check and Wasteway, and at Drop Nos. 2, 3 and 4 of the All-American Canal. Installed capacities of these plants are:
Pilot Knob33.0 MW
Drop No. 210.0 MW
Drop No. 39.8 MW
Drop No. 419.6 MW


The district also operates the 189.1 MW steam plant at El Centro. The 75 MW axis steam plant at Yucca is operated by the Arizona Public Service Company, but the Imperial Irrigation District has rights to 25 MW of the plant's production. Imperial's electrical distribution system interties with the Department of Energy's Parker-Davis system.

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Last updated: Feb 01, 2012