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22 23 .. . ~ at Lee Ferry was 12,426,000 acre-feet for the fifty-two-year period from Table 2. Geographical Occurrence of Significant Water Quality Problema in the Colorado River Basin 1914 to 1965, with extremes of 21,894,000 acre-feet in 1917 and 4,396,000 acre-feet in 1934. For the seventeen-year period from 1914 to 1930, the '" . Cl ; ... ,,;. u i < Cl Do Sub-Basins -5 Z Cl en oil en '" .to '" ..: ~ tl Basin/River Reach .: oil '" S ." C '" .: .. u " cd is .. '" ::l ~ .. Do = ca:: " i 'il is " " '" .5 '" I ca:: ca:: '0 .. " en C c I >- .: I c .. c i .. .; .,; '" u ;; Hydro- ~ 0 .. " en ... ." " logic WR5A ,.--.. :t: ~ " '" oS g" ~ '" c ca:: 11 I '" ~ Q " I I " r&I .. u '" ca:: Q g" 11 '" c 11 '" S '" " 0 i .. I I c c I ." '" .. .. :t: " " Do Do .s 0 :z: oil c u C u '" 0 S ~ :; :t: cd ;::: 0 .. S .:! .. S ~ ::l I U " .. ::l '0 :; =E ~ " ::l ::l .., 1l .. i '> 0 '" " ~ ~ 0 0 0 0 '" Q en Q g" r&I tn :I: <l g" g" :z: ~ ca:: Ui New Fork UG 1 1401 GR above LaBarge 2 1401 X GR above Fomenelle 3 1401 X X X Big Sanely Creek 4 1401 X GR above GRC, Wy. 6 1401 X X X Blacks Fork 7 1401 X X X X GR above FG Dam 8 1401 X X X X X Little Snake 9 1402 X Yampa R 10 1402 X GR above Jensen 11 1402 X X Ashley Creek 12 1403 X X Duchesne Rw. above Duc. 13 1403 Duc. above Randlett 14 1403 X X X X White River 15 1402 X X X X Price River 16 1403 X X X X X GR above Green River, Ut. 17 1403 X San Raphael 18 1403 X X CR above Hot Sulphur UM 1 1405 X Eagle River 2 1405 X CR above Glenwood 5p. 3 1405 X X Roaring Fork 4 a05 X CR above Plateau G. 5 1405 Plateau Creek 6 1405 X Gunnison R above Gun. 7 1404 X X CR above NFGR 8 1404 X Uncompahgre 9 1404,6 X X X X X CR above Grand Jund. 10 1404-6 X CR above Co1.-Ut. Line 11 1405 X X X X X San Miguel & Dolores 12 1406 X X X X CR above Cisco, Ut. 13 1406 X CR above Lee Ferry 14 1406,8 X X X X X X X San Juan above Alnboles US 1 1407 5J above Arche1eta 2 1407 X X X X X Animas 3 1407 X X X X X X 5J above Farmington 4 1407 X X LaPlata 5 1407 X 5J above Shiprock 6 1407 5J above Bluff 7 1408 X X X X X UPPER BASIN X X X average discharge was 15,919,000 acre-feet per year, while for the twenty- six-year dry cycle from 1931 to 1956 the average discharge was 11,183,000 acre-feet per year. These are residual flows reflecting upstream dep1e- tions approximating 1,800,000 acre-feet in 1914 and increasing to about 3,700,000 acre-feet in 1975. The average annual virgin flow at Lee Ferry, as unaffected by the activities of man, is estimated at 14.872 million acre-feet over the fifty-two-year period from 1914 to 1965. This contri- but ion would average about 2.5 inches in depth over the entire upper basin. Water is exported from the region through approximately forty trans- mountain canals and tunnels, mostly located at the headwaters of small tributaries. Several of these diversions have operated for many years, and in 1975 the diversions totaled 712,000 acre-feet (U.S. Water Re- sources Council, 1976). There are also more than 117 storage reservoirs in the region having usable capacities of greater than 1,000 acre-feet and a total usable capacity of more than 29 million acre-feet. Water Quality. An identification of water quality problems was ac- complished by comparing current water quality data with state and federal standards in order to develop a profile of various problem types through- out the Colorado River Basin. Analysis of the water quality parameters which exceed either federal or state standards yields the general list of problems presented in table 2. When viewed from the standpoint of both sources of the problem and the incidence of effects, problems are GR = Green River; CR = Colorado River; SJ = San Juan River WRSA = Water Resources Subareas as defined by U.S. Water Resources Council (1972) Source: Utah Water Research Laboratory, Colorado River Re~ional Assess- ment Study. Report to the National Commission on Water Dualitv {L~OAn_ Tl~ _ . primarily local, although they may occur in several places in the basin. ] ~i :l '. '? 1':: ~, .. .. ... .. .. ( f < .. .. , ~ .. .. .. .. ,.. , 5 ,i' t, j t a ~ I ~ ~ \ . I i I ! i .i f