Since annual rainfall is limited, irrigation plays a vital part of crop production in Twin Falls County. There are approximately 275,00 acres of cropland of which 99 percent are irrigated. There are four primary irrigation developments that provide water to the county's agricultural lands. The Twin Falls Tract, which is governed by the Twin Falls Canal Company, services about 202,000 acres. The water in this tract is diverted from the Snake River at Milner Dam and other storage sites up the river. The Salmon Falls Tract is administered by the Salmon Falls Canal Company Board of Directors. Its source of water comes from Salmon Falls Creek and its drainages, and the water is stored in a nine-mile long reservoir at the south end of the county between Rogerson and the Nevada line. It serves about 35.000 acres. The Roseworth Tract originates from the Cedar Creek drainage and is stored in a reservoir. This tract is in the Southwestern part of our county, and it services about 5,000 acres. In addition to these developments, there are approximately 30,000 acres irrigated by wells and Rock Creek, along with numerous other creeks.
Idaho's agriculture industry is quite concerned with the water supply levels of the state. The last few years have been somewhat dry, and water supplies have gotten lower each year. www.wcc.nrcs.usda.gov/snow/
. The USDA-NRCS SNOTEL Data Network reports information such as water equivalent reports and precipitation data.
For those of you in the Magic Valley who are dependent on the Snake River for irrigation water, the two basins you are concerned with are the Henry's Fork/Teton Basin and the Snake Basin above Palisades.
Those of you on the Salmon Tract need to be concerned with the Salmon Falls Basin and the Big and Little Wood Basins service.
The Upper Snake River Basin reservoir storage information can be monitored at www.usbr.gov/pn/hydromet/select.html
. This site is kept current by the US Bureau of Reclamation.