IOWA ACADEMY OF SCIENCE 
133 
A few years ago, the writer investigated the water supply found 
in various watersheds traversed by railroads. The summary of 
results with regard to the presence or absence of the colon bacillus, 
will be of interest in this connection: 
Stream 
Locality 
Presence or 
Absence of B. 
coli communis 
Railroad Paralleling 
Stream 
Clear Creek. ......... 
North of Denver. . . 
Absent. ...... 
Colorado Southern 
Arkansas ............ 
Pueblo, Colo 
Absent 
D. & R. G. , Santa 
Arkansas .... .... .... 
Salida, Colo. 
Absent. .... . . 
Fe; C. F. I. 
Denver & Rio Grande 
Arkansas ............ 
Shirley, Colo. ........ 
Absent. 
Denver & Rio Grande 
Small tributary of 
Arkansas .......... 
Marshall Pass, Colo . . 
Grand Junction, Colo. 
Grand Junction, Colo. 
American Falls, Idaho 
North Platte, Neb 
Waterloo, Iowa ...... 
Butte, Mont 
Absent. ...... 
Denver & Rio Grande 
Gunnison 
Absent. ...... 
Denver & Rio Grande 
Grand. ... ...... .... 
Absent. 
Denver & Rio Grande 
Snake River 
Absent.. ...... 
0 . R. & N. 
North Platte 
Absent.. 
Union Pacific 
Cedar River. ........ 
Silver Bow Creek, 
Montana ...... .... 
Present sewage 
from Cedar 
Falls ....... 
Absent 
C., R. I. & P. 
Northern Pacific 
Yellowstone, Mont. . . 
Yellowstone, Mont. . . 
Yellowstone, Mont. . . 
Livingston. ........... 
Absent 
Northern Pacific 
Billings. 
Absent. ....... 
Northern Pacific 
Glendive. 
Absent 
Northern Pacific 
Greene River, Wash . 
Green River Hot 
Springs .... ........ 
Absent. ....... 
Northern Pacific 
Des Moines, Iowa..,. 
Coon River. ......... 
Boone ...... 
Absent. ....... 
C. & N. W. 
Des Moines 
Absent 
C., M. & St. P. 
Williamette ..... .... 
Salem. .... .... 
Present sewage 
empties into 
river from 
Salem 
S. P. 
