134 
IOWA ACADEMY OF SCIENCE 
Stream 
Date of col- 
lection of 
water 
Ditch from Clear Creek, Golden, Colo. 
Average 
July 20 
Arkansas, Pueblo, Colo 
July 22 
Average 
Arkansas, Salida 
July 23 
Average. 
Arkansas, Shirley, Colo 
July 23 
Average 
Tributary of Arkansas, Marshall Pass, 
Colo 
July 23 
Average 
Tributary of Arkansas, Marshall Pass, 
Colo 
July 23 
Average 
Gunnison, Grand Junction, Colo 
Average 
July 24 
Snake River, American Falls, Idaho.. 
Average 
July 25 
Large Spring at edge of Snake River. . 
Average 
July 25 
Green River, Washington 
Aug. 9 
Average 
Silver Bow, Butte, Mont 
July 20 
Average 
Number of 
bacteria 
per c. c. 
Bacillus 
fluores- 
cens 
Gas- 
Remarks 
7700 
800 
+ 
Water muddy 
9400 
1400 
+ 
8050 
1100 
9800 
2800 
+ 
Water muddy 
13600 
1400 
+ 
11700 
2100 
28000 
10000 
+ 
Water muddy 
45000 
12000 
+ 
36500 
11000 
7200 
1000 
0 
Slightly turbid 
8000 
1600 
0 
7600 
1300 
600 
50 
o' 
Clear 
500 
100 
0 
550 
75 
120 
0 
0 
Clear 
20 
0 
0 
70 
0 
1750 
20 
0 
Clear 
1820 
50 
0 
1785 
35 
350 
0 
0 
Clear 
250 
0 
0 
300 
0 
50 
0 
0 
Clear 
80 
0 
0 
65 
0 
32000 
3200 
+ 
Turbid 
28000 
2800 
+ 
30000 
3000 
20000 
1400 
0 
Water muddy 
12000 
3500 
0 
16000 
2450 
