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| Type: | Deepening of backwater areas by dredging and installation of inlet and outlet structures for fresh water flows. |
| Construction period: | Proposed |
| Deepening backwater by dredging | 4,660,000 cu yd |
| Inlet and outlet structures to backwaters | 20 |
| Parking and sanitary facilities | 5 |
| Road construction | 24 mi |
| Type: | Stabilized banklines and training structures, constructed with land-based equipment. |
| Location | Palo Verde Dam to Taylor Ferry, 28 miles. |
| Construction period: | 1962-1968 |
| Stabilizing eroding riverbanks | 19.5 mi |
| Volume of rock riprap | 466,000 cu yd |
| Service road construction | 23.6 mi |
| Type: | Deepening of backwater areas to enhance fish and wildlife habitat by dredging and constructing inlet and outlet structures to provide fresh water circulation to backwater areas. |
| Location | Includes areas A-7, A-10, C-5, and C-10. |
| Deepening backwater by dredging | 2,012,861 cu yd |
| Inlet and outlet structures for flows | 12 |
| Capacity of each inlet and outlet | 30 cfs |
| Type: | Training structure and backwater dredging. |
| Location | 7 miles south of Blythe, California, on 26th Ave. and Colorado River. |
| Construction period: | 1972 |
| Type: | Channel excavation and levee construction by dredging |
| Location | From 2.2 miles below Taylor`s Ferry and Adobe Ruin, 24 miles. |
| Construction period | 1964-1970 |
| Channel dredging and rectification | 16 mi |
| Typical channel section: | |
| Average width of cut | 450.0 ft |
| Average depth of cut | 20.0 ft |
| Average depth of water | 7.6 feet at a minimum flow of 10,000 cfs |
| Average depth of water | 11.5 feet at a maximum flow of 20,000 cfs |
| Volume dredge excavation and levee construction | 10,343,00 cu yd |
| Volume of rehandled dredge and levee material | 981,700 cu yd |
| Riprap | 254,400 cu yd |
| Length | 32.2 mi |
| Typical section: | |
| Average height | 15 ft |
| Design flood | 80,000 cfs |
| Width between levees-varies | 750-1,000 ft |
| Volume | 6,309,230 yd3 |
| Levee roads | 32.2 mi |
| Total access and service roads | 51.8 mi |
| Average channel gradient | 0.00042 |
| Location | Lower end of Cibola Valley on the Arizona side near Adobe Ruin. |
| Construction period | 1970 |
| Volume of dredged material | 2,238,300 cu yd |
| Location | Abandoned river channel from outfall of the Palo Verde Drain to Adobe Ruin. |
| Construction period | 1970 |
| Description | Extension of Palo Verde Drain to carry drainage water, originating in Palo Verde Irrigation District, to a new outfall into the relocated river channel near Adobe Ruin. |
| Length of abandoned channel | 12 mi |
| Width of abandoned channel | 150 ft |
| Elevation of outfall near Adobe Ruin | 210 feet with riverflow of 10, 000 cfs |
| Average flow of drain | 500 cfs |
| Minimum flow | 282 cfs |
| Maximum flow | 577 cfs |
| Location | Imperial County, California. |
| Construction period | 1974 |
| Location | Diversion pool immediately upstream from Imperial Dam near the headworks of the Gila Gravity Canal. |
| Construction period | Intermittent dredging since 1969 |
| Location | On the 4.7 miles reach of Colorado River between Imperial Dam and Laguna Dam |
| Construction period | 1963-1965 |
| Method of construction: | Dredging |
| Length | 0.57 mi |
| Maximum depth, when cleaned | 24 ft |
| Average width | 450 ft |
| Sluicing flows | 5,000-7,500 cfs |
| Normal flows | Less than 1,000 cfs |
| Other flows | 3,000 cfs once or twice a year |
| Volume of material removed annually | 3,120,000 yd3 |
| Average water salvaged per year | 4,300 acre-ft |
| Length | 10,000 ft |
| Bottom width | 90 ft |
| Design depth at 5,000 cfs | 8 ft |
| Volume of riprap | 4,200 cu yd |
| Volume of dredged material removed | 1,100,000 cu yd |
| Volume of other material removed | 90,000 cu yd |
| Length | 8,700 ft |
| Bottom width | 120 ft |
| Design depth at 5,000 cfs | 10 ft |
| Volume of dredged material removed | 1,500,000 cu yd |
| Volume of other material removed | 130,000 cu yd |
| Location | Mittry Lake was formed by Laguna Dam. On east side of original reservoir, it extends from dam upstream to within one mile of Imperial Dam |
| Construction period | 1970-1973 |
| Method of construction: | Dredging |
| Land and water area | 3,575 acres |
| Reduction of Mittry Lake area from 1,200 to about 725 acres. | |
| Deepening 200 acres offshore in the 725- acre lake to minimum depth | 10 ft |
| Clearing of phreatophytes | 940 acres |
| Volume of dregded material removed | 2,019,000 cu yd |
| Lake elevation | 153.5 ft |
| Location | The original river channel from the Gila Gravity Main Canal to the California Sluiceway. |
| Construction period | Original dredging in 1970; Supplemental dredging in 1973 |
| Method of construction: | Dredging |
| Length of dredged channel | 0.5 mi |
| Width | 150 ft |
| Depth | 12 ft |
| Volume of material removed | 125,105 cu yd |
| Location | From Laguna Dam to the Southerly International Boundary. |
| Construction period | 1951-1952 |
| Description | Widening and raising existing Yuma Levee, widening and raising portion of existing Reservation Levee, constructing new stretch of the Reservation Levee around Yuma Island, and new levee and floodway along the Gila River. |
| Type: | Earth embankment and rock riprap. |
| Location | Extends along left bank of Colorado River from Yuma, Arizona, to Southerly International Boundary. |
| Construction period | 1951-1952 |
| Length | 23.7 mi |
| Dimensions: | |
| Top width | 20 ft |
| Side slopes: | |
| River side | Two:1 |
| Land side | Three:1 |
| Volume of embankment | 836,000 cu yd |
| Thickness of riprap blanket | 5 ft |
| Volume of riprap | 247,000 cu yd |
| Area protected - Yuma Valley | 50,400 acres |
| Design flood | 140,000 cfs |
| Type: | Earth embankment and rock riprap. |
| Location | Extends from Laguna Dam along California side of Colorado River to high ground about 4 miles west at Winterhaven, California. |
| Construction period | 1951-1952 |
| Length | 17.4 mi |
| Dimensions: | |
| Top width | 30 ft |
| Side slopes: | |
| River side | Two:1 |
| Land side | Three:1 |
| Volume of embankment | 898,950 cu yd |
| Thickness of riprap blanket | 5 ft |
| Volume of riprap | 297,000 cu yd |
| Area protected - California | 21,400 acres |
| Design flood | 140,000 cfs |
| Type: | Earth embankment |
| Location | Immediate vicinity of Hanlon Heading on the Alamo Canal. |
| Construction period | 1951-1952 |
| Length | 0.23 mi |
| Dimensions: | |
| Top width | 20 ft |
| Side slopes: | |
| River side | Two:1 |
| Land side | Three:1 |
| Volume of new embankment | 19,000 cu yd |
| Thickness of riprap blanket | 5 ft |
| Design flood | 140,000 cfs |
(1) - This levee prevents floods in the Colorado River from bypassing Hanlon Heading in the United States and flowing into the Salton Sea via the Alamo channel.
| Type: | Earth embankment |
| Location | Two parallel levees down the lower Gila Valley, about 0.5 mile apart with a floodway channel some 200 feet wide between the two levees. The channel and levees begin below McPhaul Bridge and the channel extends to the developed mouth of the Gila River. O |
| Length | 22 mi |
| Dimensions: | |
| Top width | 20 ft |
| Volume of new embankment | 1,420,000 cu yd |
| Length of excavation | 6.75 mi |
| Volume of excavation | 2,000,000 cu yd |
| Area protected | 26,000 acres |
| Design flood | 140,000 cfs |
| Type: | Concrete lined |
| Location | Parallels Gila River and south Gila Valley Levee from the Gila River Siphon to 0.5 mile upstream from confluence of Gila River and Colorado River. |
| Construction period | 1960-1962 |
| Length | 7.9 mi |
| Capacity | 353 cfs |
| Typical section, concrete lined: | |
| Bottom width | 8.0 ft |
| Side slope | 1.5:1 |
| Water depth | 4.3 - 6.0 ft |
| Lining thickness | 2.5 in |
| Location | Extends from end of Main Outlet Drain to below Morelos Dam |
| Construction period | 1963-1965 |
| Length | 12 mi |
| Capacity | 353 cfs |
| Typical section, concrete lined: | |
| Bottom width | 12.0 ft |
| Side slope | 1.5:1 |
| Water depth | 5.8 ft |
| Lining thickness | 3 in |
| Location | From Laguna Dam to Rockwood Heading |
| Construction period | 1969 |
| Channel dredging and rectification | 17.4 mi |
| Laguna to the mouth of the Gila River | |
| Bottom width | 120.0 ft |
| Side slope | 1.5:1 |
| Gradient | 0.000230 |
| Mouth of the Gila River to Rockwood Heading | |
| Bottom width | 150.0 ft |
| Side slope | 1.5:1 |
| Gradient | |
| Mouth of the Gila River to California Wasteway | 0.000230 |
| California Wasteway to Rockwood Heading | 0.000095 |
| Design flow of channel | 5,000 cfs |
| Grade control structures | 2 |
| Average flow | |
| Laguna Dam to the mouth of the Gila River | 250 - 300 cfs |
| Mouth of the Gila River to California Wasteway | 400 - 450 cfs |
| Below California Wasteway | 700 - 1,500 cfs |
| Average depth at flow of 300 cfs | 2.3 ft |
| Average depth at flow 700 cfs | 3.0 ft |
| Volume of dredge spoil | 4,213,000 cu yd |
| Volume of rock riprap | 264,000 cu yd |
| Road construction | 41.0 mi |
| Clearing | 2,200 acres |
| Location | East side of Yuma Valley near toe of Yuma Mesa |
| Construction period | 1965 |
| Number of wells | 6 |
| Average depth | 180 ft |
| Diameter of well surface | 24 in |
| Total annual production: | |
| Maximum design | 31,500,000 acre-ft |
| Average yearly | 10,000,000 acre-ft |
| Designation | Number of units | Total capacity, cfs | Total dynamic head, ft | Total horsepower |
| YVI-7 | 1 | 4.4 | 61 | 40 |
| YVI-13 | 1 | 12 | 59 | 125 |
| YVI-23 | 1 | 8 | 57 | 75 |
| YVI-25 | 1 | 8 | 67 | 100 |
| YVI-27 | 1 | 2.8 | 67 | 30 |
| YVI-28 | 1 | 8.3 | 64 | 100 |
| Type: | Concrete |
| Location | An open collector channel that collects the discharge from Yuma Valley Wells Nos. YVI-25, -27, -28, and Yuma County Water Users' Well Nos. 17-1/2 Street and 18-1/4 Street and conveys the drainage water north to the Southeast Drain. This drain discharges |
| Construction period | 1965 |
| Length | 1.2 mi |
| Capacity | |
| Maximum | 26 cfs |
| Minimum | 8 cfs |
| Typical section, concrete lined: | |
| Bottom width | 2 ft |
| Side slope | one:1 |
| Depth | 3 ft |
| Lining thickness | 3 in |
| Slope of bottom: | |
| Maximum | 0.0008 |
| Minimum | 0.0001 |
| Type: | Gravel-packed, cased and screened |
| Location | About 4 miles southeast of Yuma, Arizona, between the north toe of Yuma Mesa and the Gila River; extends from below Gila River Siphon to below confluence of the Gila and Colorado Rivers. |
| Construction period | 1961-1964 |
| Number of wells | 24 |
| Average depth of wells, varies | 160-300 ft |
| Normal diameter of wells at surface | 30 in |
| Casing: | Protective casing nominal diameter 3 to 15 feet below concrete slab and 1.33 foot above ground surface. A 20 inches inside diameter, 50 feet linear section reduced to 127 feet of 16 inches linear pipe and screen. |
| Total annual production | 55,000 acre-ft |
| Average salinity of drainage water | 2,200 part per million |
| Designation | Number of units | Total capacity, cfs | Pumping Level, ft Actual/Initial | Total horsepower |
| SG1 | 1 | 7.8 | 34 / 22 | 40 |
| SG2 | 1 | 9 | 38 / 32 | 60 |
| SG3 | 1 | 9 | 35 / 20 | 30 |
| SG4 | 1 | 11 | 32 / 26 | 60 |
| SG5 | 1 | 10 | 30 / 12 | 60 |
| SG6 | 1 | 11 | 28 /32 | 60 |
| SG7 | 1 | 9 | 30 / 39 | 75 |
| SG8 | 1 | 9 | 37 / 35 | 60 |
| SG9 | 1 | 9 | 28 /20 | 60 |
| SG10 | 1 | 11 | 52 / 42 | 60 |
| SG11 | 1 | 11 | 45 / 40 | 100 |
| SG12 | 1 | 9.5 | 55 / 42 | 60 |
| SG716 | 1 | 7.8 | 34 / 36 | 60 |
| SG717 | 1 | 8 | 32 / 36 | 60 |
| SG718 | 1 | 9 | 27 / 30 | 60 |
| SG719 | 1 | 9 | 24 / 29 | 60 |
| SG720 | 1 | 10 | 23 / 31 | 60 |
| SG721 | 1 | 9 | 33 / 37 | 60 |
| SG713 | 1 | 6.7 | 50 / 37 | 60 |
| SG714 | 1 | 7.4 | 40 / 41 | 60 |
| SG709 | 1 | 8.5 | 49 / 52 | 50 |
| SG711 | 1 | 10 | 24 / 40 | 100 |
| Location | In South Gila River Valley about 4 miles southeast of Yuma, Arizona. |
| Construction period | 1961 |
| Length | 3.44 mi |
| Open Channel | 3.40 mi |
| Pipeline | 0.04 mi |
| System capacity for eight wells | SG1, 2,3,4,9,11,12, and well 716 |
| Maximum | 40 cfs |
| Minimum | 8 cfs |
| Typical section - open channel | |
| Bottom width | 2 ft |
| Side slope | 1.5:1 |
| Water depth: | |
| Maximum | 3.5 ft |
| Minimum | 1.5 ft |
| Lining concrete | 2 in |
| Typical section - pipeline | |
| Type: | PCP pipe |
| Length | 0.04 mi |
| Size | 30 in |
| Location | In South Gila River Valley about 5.5 miles east of Yuma, Arizona |
| Construction period | 1961-1965 |
| Length | 2.72 mi |
| Open Channel | 2.62 mi |
| Pipeline | 0.10 mi |
| System capacity for six wells | SG5,6,7,8,10, and well 717 |
| Average | 50 cfs |
| Typical section - open channel | |
| Bottom width | 2 ft |
| Side slope | 1.5:1 |
| Water depth: | |
| Maximum | 3.4 ft |
| Minimum | 1.6 ft |
| Lining concrete | 2 in |
| Typical section - pipeline | |
| Type: | PCP pipe |
| Length | 0.10 mi |
| Length | 0.10 mi |
| Maximum diameter | 36 in |
| Minimum diameter | 24 in |
| Location | In South Gila River Valley about 7 miles east of Yuma, Arizona |
| Construction period | 1964 |
| Length | 5.8 mi |
| Open Channel | 1.8 mi |
| Pipeline | 4.0 mi |
| System capacity for six wells | Nos. SG713, 714, 719, 720, and 721 |
| Average | 60 cfs |
| Typical section - open channel | |
| Maximum | 7.0 ft |
| Minimum | 3.0 ft |
| Side slope | 1.5:1 |
| Water depth: | |
| Maximum | 3.4 ft |
| Minimum | 2.6 ft |
| Lining concrete | 2 in |
| Typical section - pipeline | |
| Type: | Cast-in-place concrete pipe |
| Length | 4.0 mi |
| Maximum diameter | 42 in |
| Minimum diameter | 24 in |
| Location | In South Gila River Valley about 2 miles east of Yuma, Arizona |
| Construction period | 1965 |
| Length | 3.4 mi |
| Open Channel | 0.6 mi |
| Pipeline | 2.8 mi |
| System capacity for four wells | Nos. 708, 709, 710, and 711 |
| Average | 40 cfs |
| Typical section - open channel | |
| Bottom width | 6 ft |
| Side slope | 1.5:1 |
| Water depth, varies | 1.0 - 2.0 ft |
| Lining concrete | 2 in |
| Typical section - pipeline | |
| Type: | Precast concrete |
| Length | 2.8 mi |
| Maximum diameter | 42 in |
| Minimum diameter | 24 in |
| Location | Along the western edge of Yuma Mesa about 2 miles south of Yuma, Arizona. |
| Construction period | 1968-1971 |
| Number of wells | 12 |
| Depth of wells, varies | 189 - 286 ft |
| Diameter of wells at the surface | 24 in |
| Maximum total capacity of the wells | 100 cfs |
| Total annual production | 60,000,000 acre-ft |
| Salinity of the pumped water | 1,330 parts per million |
| Designation | Number of units | Total capacity, cfs Actual/Initial | Total Dynamic Head, ft | Total Horsepower |
| YM-2 | 1 | 1.5 / 8.5 | 131.4 | 100 |
| YM-3A | 1 | 7.0 / 9.8 | 112.7 | 125 |
| YM-4 | 1 | 2.0 / 8.1 | 138.8 | 200 |
| YM-5A | 1 | 5.5 / 7.3 | 114.3 | 200 |
| YM-6 | 1 | 5.5 / 7.9 | 140.1 | 125 |
| YM-7 | 1 | 5.0 / 8.8 | 127.3 | 150 |
| YM-8 | 1 | 6.5 / 6.7 | 126.8 | 75 |
| YM-9 | 1 | 5.5 / 8.2 | 136.8 | 200 |
| YM-10 | 1 | 9.0 / 9.4 | 148.1 | 250 |
| YM-11 | 1 | 9.0 / 9.1 | 153.7 | 150 |
| YM-12 | 1 | 9.0 / 8.9 | 155.5 | 150 |
| YM-13 | 1 | 8.5 / 7.3 | 154.3 | 200 |
| Type | Reinforced concrete pressure pipe | |||
| Location | Extends from the center of the south line of Section 23, T.10S., R.24W., G&SRM, to a point on the Colorado River about 2.5 miles northwest of Yuma, Arizona. | |||
| Construction period | 1967-1968 | |||
| Total length of pipeline | ||||
| Length of mainline | 14.7 mi | |||
| Length of collector lines | 5.1 mi | |||
| Diameter of main conduit | 24 - 66 in | |||
| Diameter of collector conduit | 18 - 24 in | |||
| Capacity of main conduit | ||||
| Maximum | 125.0 cfs | |||
| Minimum | 7.6 cfs | |||
| Velocity | 2.6 - 5.5 cfs |
