40 



PHYSICAL GEOGRAPHY. 



a river in the world whose valley does not possess all these 

 features more or less distinctly marked. They, also divide 

 streams rising in mountainous regions into cascade, torrent, 

 and river portions, tor npper, middle and lower. This 

 division of the stream itself is more especially applicable 

 to snch rivers as take their rise in monntainons regions, and 

 flow down into and throngh a level country, thence into the 

 sea or another river. 



Remembering what has been said of the general topog- 

 raphy of the State, it will at once be seen that such a division 

 of the different parts of the courses of our Iowa streams is 

 not applicable, because they run through a flat country all 

 the way from their sources to their mouths. It will also be 

 seen that those portions of them which are omitted from the 

 table are free from torrents or cascades, because they pass 

 along upon the incoherent surface deposits alone, not having 

 reached the firm underlying strata : 



A TABLE 



Slopes of the Principal Rivers of Iowa. 



NAMES . 



Mississippi .. 



Missouri 



Des Moines . . 

 Des Moines . , 

 Raccoon 



N. Raccoon . . 

 Skunk 



Skunk 



Iowa 



Iowa . 



Cedar 



Cedar , 



Cedar 



Wapsipinicon 



Maquoketa. . , 

 Turkey 



Upper Iowa. 



PART OF COURSE. 



SLOPE 

 PER MILE. 



AUTHORITY. 



I From Lansing to the conflu- 

 ence of the Missouri 



From Sioux City to Council 

 Bluffs 



From Fort Dodge to Ottumwa 



From Ottumwa to the mouth. 



From forks of the river to its 

 mouth 



From Jefferson to the forks. . 



From Colfax station to Oak- 

 land 



From Oakland to the mouth . 



From Iowa Falls to Iowa City 



From Iowa City to the mouth 



From State boundary to Cedar 

 Falls 



From Cedar Falls to Moscow 



From Moscow to the mouth . 



From Independence to the 

 mouth 



From M anchester to the mouth 



From Crane creek to the 

 mouth 



From Decorah to the mouth 



ft. 6 in. J. E. Aiusworth. 



lft. 

 2 ft. 

 lft. 



2 ft. 



4 ft. 



2 ft. 

 lft. 



3 ft. 



2 ft. 



3 ft. 

 2 ft. 

 2 ft. 



2 ft. 



3 ft. 



5 ft. 



8 ft. 



in. Railroad levels. 



4 in. 

 11 in. 



11 in. 

 Oin. 



2 in. 



6 in. 

 . 1 in. 



4 in. 



7 in. 



5 in. 

 Oin. 



10 in. 

 4 in. 



Oin. 



6 in. 



Railroad levels. 

 Railroad levels. 



Railroad levels. 

 Railroad levels. 



Railroad levels. 

 Railroad levels. 

 Railroad levels. 

 Railroad levels. 



Railroad levels. 

 Railroad levels. 

 Railroad levels. 



J. E. Ainsworth. 

 J. E. Ainsworth. 



Railroad levels. 

 Railroad levels. 



