SALMON INVESTIGATIONS IN COLUMBIA RIVER BASIN IN 1896. 
17 
valley above Alturas Lake was from a few inches to 3 feet under water. Not until 
about July 22 was it possible to reach the head of the lake with a wagon, and the 
outlet could not safely be forded earlier than that date. After July 14, however, the 
water ran down very rapidly, and during August and September Alturas Creek was 
only slightly higher than in 1895. 
Temperatures . — Temperature observations were made as regularly as circum- 
stances permitted. The records for July 11 to July 21, inclusive, are those made at the 
camp on the outlet of Alturas Lake. The thermometer for air temperatures was 
kept hanging in the shade on a tree at the camp; the water temperatures were taken 
in the creek at the camp in water about a foot deep. 
Temperatures recorded at the outlet of Alturas Lake, Idaho, July 11 to 21, 1896. 
The temperatures recorded in the following table are those taken at the camp at 
the head of Alturas Lake. The “inlet” temperatures were taken a few feet above the 
lake where the water was about 2 feet deep; those for the lake were taken just in 
front of our camp at a depth of about 3 feet, and those of the air were in the shade : 
a During the night of August 3 there were heavy thunder and rain, snow falling on the mountains. 
F. C. B. 1897—2 
