119 The Agricultural Economy of the American Bottoms 
Temper- Months for 1934 
Jan, 
Feb. 
Mar, 
. bs “ 
A os 3 3 #2 
< > FF < 
| 
Se = 
BB ics . = 
a be 
Temperatures during 1934, ———____ Normals. 
Fic. 23—Mean monthly temperatures for St. Louis (1934) der 
THE RELATIONSHIPS OF OTHER Types OF CULTURAL PHENOMENA 
TO THE AGRICULTURAL PATTERN 
Transportation routes—Most of the network of railroads, chiefly 
converging on East St. Louis and Alton, was constructed before much 
serious thought had been 
the American Bottoms (Fig. 26). 
lines 
possible disturbance of natural drain- 
age lines (Fig. 27). Lawsuits have 
by farmers who clai 
floods which would 
fered with natural drainage.1 
approaches are narrow and steep, 
clearances have been constructe 
Side Levee and Sanitary Board, in constructing the Cahokia Diversion 
Channel, had to bear the expense of constructing five railroad bridges. 
1Helm, op. cit., pp. 96-97, 
ived from material zbrd. 
