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I <br />Table 4.-Historic zooplankton concentrations for three Colorado River reservoirs. <br />Zooplankton (/L) <br />Year Yrly Sprg. <br />Lake Impounded Yr. Avg. Avg. Location Method Citation <br />Mead 1935 '75-' 76 50.6 41.0 Lakevide 0-45m depth Burke 1977 <br />'77-1 78 `33.8 At dam 0-40m depth Paulson et al. 1980 <br />'78-' 79 37.4 Lakevide 20m H & McCall 1980 <br /> 0-20m V <br />'81-' 82 25.2 35.4 Lakevide Wilde 1984 <br />Havasu 1938 '82-' 83 82.7 49.1 Lakevide Baker & Paulson 1983b <br />Mohave 1950 '77-1 78 29.0 Lakevide 0-40mdepth Paulson et al. 1980 <br />'77-' 78 45.5 Cottonvd 0-40mdepth Paulson et al. 1980 <br />'77-' 78 1.8 Below to bottom Paulson et al. 1980 <br /> Hoover Dam <br />1982 -35.0 26.3 Cottonvd 0-40mdepth Paulson (unpubl.data) <br />1985 1.5 Cottonvd surface Marsh and Langhorst 1988 <br />1985 0.4 Backwater surface Marsh and Langhorst 1988 <br />rn