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<br />15 USDA ROLE
<br />
<br />runoff, Collectively, these problems
<br />have resulted In increased salinity
<br />problems by leaching salts into the
<br />river system. Approximately
<br />1 million acres are irrigated in
<br />17 Identified Irrigation salt source
<br />areas in the Colorado River Basin,
<br />l' j SCS estimates onfann water
<br />'-" management and salinity control
<br />00 measures would be cost effective on
<br />.L;.. over 600,000 acres In 11 different
<br />salt source areas.
<br />
<br />Irrigation Salt Source
<br />Studies
<br />
<br />The SCS conducts the sallnlty
<br />control studies of irrigation salt
<br />source areas in the Basin. These
<br />studies have been done under the
<br />River Basin Studies authority of
<br />Public Law 83-566, The studies
<br />evaluate the magnitude of salt
<br />loadings, the treatment and
<br />management alternatives for
<br />salinity control, and estimated
<br />project Implementation costs,
<br />Working in cooperation with
<br />Reclamation, other Federal agencies,
<br />and concerned state agencies, USDA
<br />has completed eight major studies
<br />to date - Grand Valley, Colorado;
<br />Uinta Basin, Utah; Big Sandy,
<br />Wyoming; Moapa Valley, Nevada;
<br />Virgin Valley, Nevada and Arizona;
<br />and Lower Gunnison, McElmo
<br />Creek, and Mancos Valley,
<br />Colorado, A joint study is
<br />underway with Reclamation in the
<br />Price-San Rafael Rivers Unit, Utah,
<br />Four other areas have been
<br />investigated: two were suspended
<br />and two had no recommended
<br />plans,
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<br />Project Implementation
<br />
<br />Four USDA Colorado River
<br />salinity control projects are under
<br />implementation: the Grand Valley,
<br />Colorado (initiated 1979); Uinta
<br />Basin, Utah (initiated 1980); and the
<br />Big Sandy, Wyoming, and Lower
<br />Gunnison, Colorado, (initiated in
<br />1988), These projects focus on the
<br />application of salinity control
<br />practices to improve onfarm
<br />irrigation water management and
<br />related lateral delivery systems to
<br />reduce deep percolation and salt
<br />loading, Other USDA projects are
<br />scheduled for future implementa-
<br />tion. The status of these projects is
<br />shown in the listing of all salinity
<br />control projects in this publication,
<br />
<br />Under the USDA Colorado
<br />River Salinity Control Program
<br />participants, with technical
<br />assistance from SCS, plan, install,
<br />and maintain salinity reduction
<br />practices including replacement of
<br />fish and wildlife values foregone,
<br />
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