70 College of Forestry 



East of Thierre's landing to Norcross^ Point, including the 

 steamboat wharf at South Bay (fig. 14), the bottom is of hard 

 sand and the vegetation is reduced to comparatively few spe- 

 cies, among which Bulrush (Scirpiis) and Water Willow 

 (Dianthcra) predominate, bordering the shore. In the deeper 

 water the plants become more numerous, and include the take 

 Bulrush (Scirpiis occidentalis), several Potamogeton, Myrio- 

 phylluni, and El odea. Between Thierre's landing and the 

 steamboat wharf there is an area of bottom which is very 

 bouldery, the water being from two to three feet deep. The 

 depth increases gradually in this area from a foot or more to 

 the 6-foot contour. 



Between the steamboat wharf and the Norcross Point shore 

 there are two lagoons which exhibit a variety of habitat condi- 

 tions (fig. 15). These are separate4 from the lake or bay by 

 three small points of land, or peninsulas, which protect these 

 bodies of water from the rough water incident to northwest 

 storms. The peninsulas have a sand, gravel, and boulder bot- 

 tom on the north or exposed sides and the water is shallow 

 northward for a considerable distance. On the south or pro- 

 tected sides of these points of land the bottom is of fine sand, 

 clay or mud and the water rapidly deepens to five and six feet. 

 Vegetation is very luxuriant, Typha angustifolia, Scirpus 

 americanus, and Scirpus occidentalis bordering the shore and 

 a large number of submerged plants filling the water to such 

 an extent that it is difficult to push a boat through them. 

 Among these, Potamogeton is conspicuous both in number of 

 species and in individual plants. The surface of the water is 

 thickly covered with a growth of filamentous algse, Cladophora 

 and Qldogonium, (Table No. 10). 



6. The Deeper Water Habitats of Lower South Bay. 

 Beyond the 6- foot contour, the depth of water gradually in- 

 creases toward the east until it attains 15 feet at the entrance 

 to the bay. The bottom material is black mud, usually soft 

 and covered with organic debris and some algae. Ofif the points 

 there is often an admixture of gravel. Vegetation is all of the 

 submerged type and is in most places very abundant, forming 

 a mass of plants, Potamogeton and Myriophyllum being the 



