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TABLE LC-10 <br />Lower Colorado River Basin <br />Population Estimates <br />1876-1880 <br />(1,000's) <br /> <br />State Tributary <br />1976 Estimated Population <br />1977 1978 1979 <br />1980 <br />Arizona Mainstream Colorado* 128.5 135.4 140.2 147.3 152.9 <br />Gila 1,955.9 2,037.3 2,194.8 2,279.0 2,336.3 <br />Little Colorado 128.5 132.6 144.7 149.0 153.4 <br />Bill Williams 7.7 8.3 8.7 9.2 9.5 <br />Virgin 0.4 0.4 0.4 0.5 0.5 <br />Total 2,221.0 2,314.0 2,488.8 2,585.0 2,652.6 <br />California Mainstream Colorado 21.3 21.4 21.6 21.7 21.9 <br />Nevada Mainstream Colorado* 361.9 378.9 405.5 436.0 461.8 <br />Muddy 3.0 3.1 3.3 3.5 3.7 <br />Total 364.9 382.0 408.8 439.5 465.5 <br />New Mexico Gila 5.4 5.5 5.7 5.7 5.8 <br />Little Colorado 45.8 46.7 47.3 46.6 46.0 <br />Total 51.2 52.2 53.0 52.3 51.8 <br />Utah Mainstream Colorado* 2.1 2.2 2.3 2.6 3.1 <br />Virgin 18.0 19.2 20.0 22.6 26.1 <br />Total 20.1 21.4 22.3 25.2 29.2 <br />Lower Basin Mainstream Colorado* 513.8 537.9 569.6 607.6 639.7 <br />Gila 1,961.3 2,042.8 2,200.5 2,284.7 2,342.1 <br />Little Colorado 174.3 179.3 192.0 195.6 199.4 <br />Bill Williams 7.7 8.3 8.7 9.2 9.5 <br />Virgin 18.4 19.6 20.4 23.1 26.6 <br />Muddy 3.0 3.1 3.3 3.5 3.7 <br />Total 2,678.5 2,791.0 2,994.5 3,123.7 3,221.0 <br />*Includes Remaining Area population. <br />41 <br />