Final environmental statement, Southern Nevada Water Project, second stage

The Southern Nevada Water Project, a water supply system for the Las Vegas area, was authorized by the Acts of October 22, 1965, and July 19, 1966 (Public Laws 89-292 and 89-510). These acts authorized staged development. The first stage, completed in 1971, consists of intake facilities at Lake Mead, eight pumping plants, a main aqueduct 2-1/2-miles long, a 4-mile-long tunnel, and 30 miles of pipelines and laterals. The State of Nevada constructed the Alfred Merritt Smith Water Treatment Facility in conjunction with the first stage. The first stage system has the capacity to deliver 132,200 acre-feet per year. The second stage consists of five new pumping plants, modifications to four existing first stage pumping plants, a 2.5-mile-long second barrel to the main aqueduct installed beside the first stage, and 30 miles of new aqueduct and pipelines with a capacity of 166,800 acre-feet per year. The State of Nevada plans a major expansion of the Alfred Merritt Smith Water Treatment Facility in conjunction with the second stage. The second stage will cause a slight deterioration in the water quality of return flows from the Las Vegas area to Lake Mead. It will temporarily disturb 188 acres of vegetation and wildlife habitat and eliminate 12 acres. The project will employ about 100 people for construction and 20 people for the operation and maintenance. Operation of the second stage will require a maximum annual power supply of 280 million kWh. The second stage will deliver enough water to accommodate a population of 750,000. Population growth will further deteriorate the air quality, will require more land for urban development, and additional municipal services

Calculated current velocity data

Data collected at various stations around the Lake Mead vicinity. Air temperature, lake elevation, weather, and wind velocity is recorded, as well as the depth, magnitude, resolved angle, and bearing of the water currents

Outlet Pipes for Echo Dam

Specifications, schedule, and drawing of outlet pipes for Echo Dam: Salt Lake Basin Project, Utah

Floodplain Habitat Restoration at Thunder Ranch, Utah

The Upper Colorado River Endangered Fish Recovery Program (Recovery Program) is proposing to restore endangered fish habitat at 330 acres of Green River bottomlands located on the Thunder Ranch near Jensen, Utah. The Recovery Program acquired a total of 455 acres of easement from Thunder Ranch to protect and improve floodplain habitat for the benefit of endangered Colorado River fishes. The project area is located adjacent to the Green River within an old meander river channel. Several ponds and wetlands exist in the project area, but are isolated from the Green River by an earth-filled levee. By notching the existing levee that separates the ponds from the Green River, the proposed action would allow endangered fish larvae to drift from the river into the ponds and use the ponds as a nursery habitat. An active razorback sucker spawning site is located several river miles upstream of the project area. Sub-adult and adult razorback sucker and Colorado pikeminnow would also benefit with access to additional habitat