Drift i?i MhmeapoliSy Minn. — Uphajn. 275 
30 feet more. ■ Their average slope for this distance of eight 
miles is thus about 15 feet to a mile. 
Associated with the modified drift deposits of plains, low 
plateaus, and esker ridges and hills, are numerous beautiful 
lakes, of which several are wholly or partly owned by the city, 
being included in its magnificent system of parks and boule- 
vards extending along the lake shores. 
Tracts of till reach into the city limits both east and west 
of the river. On the east the till presents the very irregularly 
hilly contour characteristic of marginal moraines, diversified 
by bowl-like hollows which contain sloughs, small peat bogs, 
and lakes. This eastern moiaine has the highest land of the 
city area, about 975 feet above the sea, in its northeast corner ; 
and slightly more than a mile farther north, near the city res- 
ervoir, the morainic hiJls rise a hundred feet higher. The mo- 
raine probably owes its altitude partly to prominence of the 
underlying rock strata; but in general the surface of the city, 
excepting the postglacial gorge of the Mississippi below the 
falls of St. Anthony, was shaped by the conditions of deposi- 
tion of the glacial and modified drift. 
Table op Elevations. 
The following elevations are noted in feet above mean 
tide sea level. They are derived from my former tabulation,* 
and from George W. Cooley, county surveyor, and Ellis R'. 
Dutton, assistant city engineer. 
Mississippi river at the m')uth of Rum river, Anoku, 15 miles 
above Minneapolis 825 
At mouth of Rice creek, Fridley 800 
Crest of St. Anthony's Falls, ordinary and highest stages. . .796-802 
Under the stone arch railway bridge, low water 739-743 
At the lower end of Hennei^in island 738 
At the St. Paul and Northern Pacific Railroad bridge, one 
mile below the falls 720 
At the Chicago, Milwaukee and St. Paul Railway bridge, low 
and high water 709-724 
At the Fort Snelling bridge 6qo 
Mouth of Minnesota river, extreme low and high water 688-710 
At St. Paul, low and high water 683-702 
At the mouth of the St. Croi-v river 667-687 
Lake Pepin, low and high water 664-681 
*.\ltitudes between Lake Superior and the Rocky Mountains, Bulle- 
tin 72 of the U. S. Geol. Survey, 1801, pp. 150, 183, etc. 
