. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. 24 CALIFORNIA FISH AND GAME and has a surface area of 344 acres. The map of the lake (Fig. 21) shows the form of the basin by means of depth contours. Soundings are repre- sented by dots, accompanied by the corresponding depths in meters. Contours shallower than 15 meters (49 feet) were traced from a map prepared in 1908 by the engineers of the Pacific Gas and Electric Com- pany, before the water level was raised by a 30-foot dam acro
. California fish and game. Fisheries -- California; Game and game-birds -- California; Fishes -- California; Animal Population Groups; Pêches; Gibier; Poissons. 24 CALIFORNIA FISH AND GAME and has a surface area of 344 acres. The map of the lake (Fig. 21) shows the form of the basin by means of depth contours. Soundings are repre- sented by dots, accompanied by the corresponding depths in meters. Contours shallower than 15 meters (49 feet) were traced from a map prepared in 1908 by the engineers of the Pacific Gas and Electric Com- pany, before the water level was raised by a 30-foot dam across the outlet. The drainage basin of the lake comprises approximately square miles. The climate of the region in which it lies is rigorous, and the lake is ordinarily frozen six months out of the year. BlueLake is highly and typically oligotrophic (oligotrophic lakes are poor in available dissolved nutritive material, and rich in dissolved oxygen; they are usually deep. Cf. Welch, 1935, p. 310). The water is clear. A Secchi disk is ordinarily visible to a depth of about nine meters (30 feet), and there is little variation in this respect during the summer. The development of thermal stratification during the summer of 1941 is illustrated in Figure 22, which shows a seasonal sequence of depth-tem- perature graphs extending over the period from June 23, when the ice melted from the lake, to September 13, when observations were discon- tinued. Figure 23 contains a corresponding series of graphs showing the relationship between depth and concentration of dissolved oxygen, as determined by the modified "Winkler method (American Public Health Association, 1936), over the same period. Conditions in 1940 were essentially the same as those shown for 1941. In both years the thermo- cline became established at a depth between four and six meters (13 and 20 feet) some three weeks after the ice had melted from the lake, and was maintained throughout the summer, sinking progressive
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