276 The American Geologist. May, 1900 
Lake Minnetonka, extreme low and high water Q26-932 
Its average water level during 1885, 930; during 1898 929 
This lake, outflowing, except in very dry seasons, by Minnehaha 
creek, has an area of 25 square miles, and a watershed (including the 
lake) of 115 square miles. Its average depth, according to Mr. Cooley's 
soundings, is about 30 feet, and its greatest depth 100 feet. 
Minnehaha creek in the southwest part of Minneapolis, at Hum- 
boldt avenue, close below the mouth of the tributary from lake 
Harriet 840 
At Rice lake 812 
At Minnehaha avenue 802 
At Minnehaha falls, crest and foot 796-742 
Confluence with the Mississippi, low and high water 695-715 
Chain of lakes tributary to Minnehaha creek from the north: 
Cedar lake (without visible outflow) 857 
Lake of the Isles 853 
Lake Calhoun (also recently called lake Mendoza) 852 
Bass lake, tributary from the west 878 
Lake Harriet 845 
Lakes tributary to Minnehaha creek from the south: 
Pearl lake 822 
Diamond lake, about 820 
Mother lake (very shallow, drying almost entirely in 1898), about 816 
Lake Amelia 813 
Powder Horn lake, about 825 
Lake in Loring park, about 820 
Keegan's lake, on Bassett creek 815 
Crystal lake 85 1 
Twin lakes, tributary to Shingle creek 851 
Sandy lake, shallow, in Columbia park 842 
Silver lake 930 
Water works reservoir, road and top of stone coping, 1026; usual 
water level 1023 
Hills of marginal moraine close east of the reservoir, about 1075 
In northeast corner of city area, about 975 
In Prospect Park, about 950 
Hill of till ^ mile north of Farview park, . about 930 
Highest points of the Lowry hill esker series 940-900 
Highest hills of the Lake Harriet esker series, about 940 
Union railway station 810 
Chicago, Milwaukee and St. Paul railway station ; 826 
Ground at State University buildings 830-840 
Zero of city system of leveling 708.64 
Rock Formations under the Drift. 
The falls of St. Anthony and of Minnehaha are formed by 
the hard and durable Trenton limestone, underlain bv the soft 
