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<br />... ~?" <br />r;.) <br />>_..:;iot <br />.-t <br /> <br />" ~ <br />'_~J <br /> <br />III. BASIN-WIUE MONITORING ANU ~VALUATION <br /> <br />Background <br /> <br />Many local, state, and federal agencies are involved in the on-going <br /> <br />basin-wide monitoring and evaluation effort in the Colorado River Basin, <br /> <br />Measurements are made of both quantity and quality of water. The major <br /> <br />thrust of the present monitoring is to deterwine water quality or salinity <br /> <br />quality as water moves from the head waters downstream. iJata is evaluated to <br /> <br />1dentify mechanisms causing water pollution and areas needing control, as <br /> <br />well as to establish trends and project future salinity levels, ~~ny <br /> <br />agencies supply data and interpretations directly or indirectly to the <br /> <br />Colorado River Basin Salinity Control Forum. <br /> <br />The United States Geological Survey (USGS) maintains a network of stations on <br /> <br />the main stem and tributaries of the Colorado River. Periodic measurements <br /> <br />are made of water quality and quantity. Water quality data from 20 selected <br /> <br />primary stations date back to 1926 with the majority of stations having <br /> <br />substantially complete records since 1950 (See Figures 2 and 3). Water <br /> <br />quality samples' are taken daily at most of the 20 primary stations. <br /> <br />There are numerous water quality stations of . local" interest being monitored <br /> <br />by USGS, U. S. Bureau of Reclamation (USBl<), and other f,ederal, state, and <br /> <br />local agencies. These local stations are in tne most part used to identify <br /> <br />the general magnitude of water quality durinb the year, It is estimated USGS <br /> <br />alld U:;]lll monitor approxiLlate:ly lUU "local" stations in t.,1e Upper Colorado <br /> <br />l{1ver !Sasin in addition to the lJSGS network described above, <br /> <br />11 <br />