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north of Ogden Island known as Oak Island, borders the bay on the north, send- 

 ing off a broad marsh across the country to the northeast, and continuing along 

 the east side of the bay with a, width of a half mile, joins a narrow marsh ex- 

 tending to the southeast. On the east side of Johnson's Bay are two bluffs, one 

 reaching a height of 23 feet and extending from Cedar Point northwest one- 

 quarter of a mile along the shore and having 500 feet for its greatest width ; the 

 other is 1,000 feet further to the northwest, and is between 10 feet and 15 feet 

 high, 700 feet long and 150 feet wide. Lying to the northeast of these bluffs and 

 extending between them is an arm of the Johnson Marsh from 50 feet to 800 feet in 

 width, which joins Crow's Bay just east of Cedar Point. From the northeast cor- 

 ner of Crow's Bay the bluffs extend south along the east end of the lake for a 

 half mile. They are from 10 feet to 27 feet in height. The 10-foot elevation line 

 then leaves the shore and extends almost south to Turkey Creek, leaving an area 

 of well timbered dry land along the lake with an elevation of from 3 feet to 10 

 feet and attaining a width of 1,000 feet. 



The land on both sides of Turkey Creek, the inlet of the lake, is marshy. 

 Lying to the north of the mouth of the creek this marsh is 400 feet wide and ex- 

 tends one-quarter of a mile north along the lake. This marsh is separated from 

 the marsh along the east margin of Morrison's Island by a shallow channel of 

 water. The west side of Morrison's Island is a bluff reaching a height of 21 feet. 

 From Turkey Creek to Buttermilk Point the shore is skirted with marsh from 200 

 feet to 400 feet wide. Mineral Point is 200 feet from the lake and ascends abruptly 

 from the marsh to a height of 25 feet. A half mile south of Turkey Creek the 

 lake is entered by Jarrett's Creek which is the outlet of a chain of small lakes 

 lying southeast of Jarrett's Bay. This stream flows through a marsh 400 feet wide, 

 and all the small lakes are bordered by marsh land. The marsh along the lake 

 ends at Buttermilk Point, and for a quarter of a mile the shore is dry and 

 sandy. The land along this shore is not a perpendicular bluff, but rises rapidly 

 from the lake to the south and reaches a height of 40 feet at a distance of 400 feet 

 from the shore. The west side of Jarrett's Bay is skirted by a marsh from 150 feet 

 to 1,000 feet wide. West of the marsh is a bluff from 10 feet to 15 feet high con- 

 tinuous with the-land south of the bluffs of Vawter Park. West from Clark's the 

 south shore of the lake is a perpendicular bluff reaching a height of 29 feet in 

 Vawter Park and extending west beyond the point where our survey of the sum- 

 mer ended. This bluff is cut by a ravine 50 feet wide at the Biological Labora- 

 tory and by a small stream entering the. lake a quarter of a mile west of Vawter 

 Park. The shore extending west to and around Black Stump Point is from 5 feet 

 to 15 feet above the level of the lake. The high bluffs from Clark's Point to Black 



