N ORTH WESTERN LAKES OF THE UNITED STATES. 
77 
of the stomachs obtained in August mayflies constituted the entire content of the 
stomach. 
These results given in Tables 5 and 6 above show that the perch were feeding 
chiefly on insects and amphipods during the summer months, but that Daphnias 
constituted the major element of their food during the winter. 
LAKES IN EASTERN WASHINGTON AND IDAHO. 
Table 7. — Lakes examined in eastern Washington and Idaho. 
County. 
Direction 
of greatest 
length. 
known 
depth. 
Calvert or 
Deep. 
Chatcolet 
Idaho 
Washington. 
Idaho 
Washington. 
Deer 
Fish Trap. 
Hayden. 
Henry... 
Liberty 
Loon 
Lower Twin. 
Medical 
Newman 
Priest. 
Silver. 
Spirit. 
do 
Washington. 
Idaho 
Upper Priest 
Upper Twin. 
W imams — 
Wright 
Bear Lake. . 
Spokane 
Kootenai 
Chelan 
Spokane 
Kootenai 
Stevens 
Lincoln and 
Adams. 
Kootenai — 
Fremont 
Spokane 
Stevens 
Kootenai 
Spokane 
do 
Boise 
Bonner and 
Kootenai. 
Bonner 
Spokane 
Kootenai 
Pend Oreille, 
Bonner 
Kootenai 
Spokane 
Kootenai... 
NW.-SE. 
NW.-SE. 
N.-S. 
N.-S. 
N.-S. 
N.-S. 
N.-S. 
E.-W. 
N.-S. 
NW.-SE. 
E.-W. 
N.-S. 
NW.-SE. 
329.2 
647.5 
743 
783.5 
'705." 5 
2,050 
2,440 
2,570 
2, '315 
Blue-nose trout. 
Black bass, perch. 
Black bass, cutthroat, 
trout. 
Dolly Varden trout. 
Cutthroat trout, 
perch. 
Trout. 
Bass, perch, trout. 
Do. 
Perch, trout. 
Not any. 
Bass, perch, trout. 
Cutthroat trout. 
Dolly Varden and cut- 
throat trouts, white- 
fish. 
Cutthroat trout. 
Bass. 
Cutthroat trout. 
Do. 
Trout. 
Perch. 
Bass, perch. 
BEAR LAKE, IDAHO. 
Bear Lake is located in the southeastern corner of Idaho and in northern 
Utah, about one-half in each State. It is fed by numerous mountain streams, 
many of which afford excellent trout fishing. The lake is about 32 km. (20 miles) 
long, north and south, and 6.5 km. (4 miles) wide, and has an elevation of 1,806 
m. (5,924 feet). 
The east bank is steep, and the mountains on that side reach an elevation of 
2,216 m. (7,270 feet). The west shore has a very gradual slope. The east beach 
is composed of coarse gravel, and the west beach is covered with a light blue marl, 
which gives the lake its characteristic opalescent blue color. 
The soundings indicate that the bottom of the lake is a continuation of the 
shore slopes, as it deepens gradually from the west, and the deepest water was 
located within 0.4 km. (i of a mile) of the east shore and a little south of the State 
line. 
