404 ' American Fisheries Society 



of the stream had also decreased considerably, for we were 

 able to ford the creek at the mouth, where on the previous 

 visit the water had been 12 to 15 inches deeper and fording 

 was impossible. 



Later we visited Saint Anne Lake and a study of the con- 

 ditions there indicated clearly a marked and constant reduc- 

 tion in volume and a gradual rise in temperature during the 

 period just before our arrival at the lake. For a considerable 

 period the weather had been clear and sunny with very little 

 rain. The general aspect of the country shows that Saint 

 Anne Creek gets the major part of its volume from the lake 

 and only a smaller amount from lateral tributaries. The lake 

 lies in the flat land distant from the mountains, and can not 

 be in receipt of a constant supply of cold water from melting 

 snows. When the winter snows have mostly melted and the 

 storms of early summer are at an end, the water level of the 

 lake stands at its maximum height and the outlet creek carries 

 its greatest volume of water. The lower end of the lake 

 near the outlet, a stretch of two or three miles in length, is 

 very shallow and had warmed up considerably in comparison 

 with the other waters we had tested. In consequence, at the 

 time of our visit its temperature stood at 55° F, Colder water 

 was running into the creek at various places along its course, 

 and the volume of this inflow was sufficient to reduce the tem- 

 perature of the stream below that of the lake when the dis- 

 charge from the lake was reduced in volume. During the 

 warm sunny days which characterized this period there was 

 opportunity for the water in the creek to become distinctly 

 warmer than it had been earlier in the year. This evident 

 change in temperature, of which we observed the last stage 

 only, was associated with the cessation of the red salmon run 

 and the termination of the spawning by that species in its 

 waters. 



The study of the situation at the head of Lake Klutina, 

 which I have discussed in detail in another place, showed that 



