9318

• UCREFRP Catalog Number: 9318
• Author: U.S. Fish and Wildlife Service.
• Title: Procedures for Stocking Nonnative Fish Species in the Upper Colorado River Basin.
• USFW Year: 1996.
• USFW - Doc Type: Denver.
• Copyright Material: NO

A. ENGINEERING -- HYDROLOGY
1. Colorado River Salinity Program
The Upper Colorado River Commission has continued its interest and
involvement in the Colorado River Basin salinity problem. The Commission staff has
worked with representatives of the Commission's member States in coordinating and
correlating activities with other State and Federal agencies, particularly the Colorado
River Basin Salinity Control Forum, which is composed of representatives from the
seven Colorado River Basin States. The Forum has developed water quality
standards and a plan of implementation to meet the Environmental Protection Agency
Regulation (40 CFR Part 120, Water Quality Standards--Colorado River System:
Salinity Control Policy and Standards Proceduresl.
Section 303 of the Clean Water Act requires that water quality standards
be reviewed from time to time and at least once during each three-year period. The
Forum in 1996 reviewed the existing State-adopted and Environmental Protection
Agency-approved numeric salinity criteria and found no reason to recommend
changes for the three lower mainstem stations.
The values are:
Salinity in Img/II
Below Hoover Dam ........................... 723
Below Parker Dam ........................... 747
Imperial Dam ................................ 879
The Forum is continuing to study salinity conditions and to develop new
salinity projections. The Forum is also developing flow versus salt load relationships
that will reflect present and anticipated conditions.
Salinities at each of the three lower mainstem stations for which numeric
criteria have been established have decreased since 1972,