RIVER MEANDERS ON THE MIDDLE ROUGE 757 



The margins of the pond when first the dam was buih, must have 

 been the bluffs on either side of the flood plain and the pond must 

 have extended back half a mile from the dam as is shown by the 

 deposits. The pond when the dam broke, was much smaller, due to 

 deposits of silt, its limits at the head of the valley being marked by 

 the peculiar hummock or mound configuration built up by the sedge 



Fig. 2. — Break in Dam (looking S. E.). During high water on May 30, 1905, 

 the dam gave way leaving a break at the end of the waste weir and bridge as shown in 

 Fig. 2. When the water was drawn off, the floor of the pond was almost entirely 

 covered with Knotweed (Polygonum Muhlenbergii) standing from three to five feet high. 



(Carex stricta) and added to later by turf -forming grasses.^ These 

 tuft formations mark off sharply the limits of the pond on the margins 

 away from the dam and shown in Fig. 4. Here the stream has cut a 

 narrow channel in the bed of the old, wider course, but preserved 

 the old bed, the banks of the old course being marked off sharply, the 



I Brown, Bot. Gaz., October, 1905, p. 270. 



