The lesser dam at A map t, if it now existed, would have 

 a crest twelve (12) feet above the lake waters, and would fill 

 in the valley here north and south. ' The three contour lines 

 converge perceptibly here on the west, but only the 10 foot isac- 

 tually at hand. The altitudes go above it however on the west- 

 ern side, reaching nearly eighteen feet. A heavy mesophytic 

 forest is growing all about the place both on the heights and 

 in the old valley, so that any continuous view is impossible. 

 On the eastern side there are two twelve foot hills which form 

 the eastern abutment. This dam was apparently the last one 

 to give way and its long continued influence in retarding- the 

 ancient waters is distinctly seen all about the lake's shores. 

 Indeed, in a way, the effect of this dam was more powerful 

 and enduring than that of the greater one, for while the work 

 of the higher waters was on a more magnificent scale, yet 

 much of their work has long been effaced, while that of the 

 lesser waters through the longer period of action, has been 

 more pronounced. A great deal of the finest bluff work of the 

 higher waters has been nearly obliterated by weathering, 

 while the work done by the lower waters has been largely pre- 

 served by the heavy growth of vegetation upon the lower bluffs 

 and embayments These lower evidences of lake action may 

 be easily recognized and traced by the willow zones before 

 mentioned. 



The larger dam at B has abutments still standing indicat- 

 ing th&t when existing it had a crest of twenty-two feet. It 

 crossed the valley transversely and was much wider and more 

 massive in every way than the smaller dam. Both of these 

 dams were formed by glacial action, the material probably be- 

 ing heaped together laterally in ridges as indicated by the con- 

 vergence of the contour at this point. The great beach on the 

 eastern side of the lake was formed while this, the larger dam 

 was intact. After a length of time had elapsed, the length of 

 which it would be difficult to measure, the upper part of the dam 

 slowly yielded to the overflow, and as fast as it gave way the 

 faster the water flowed through the gap until the cutting 

 reached the bottom. The abutments receded until they reached 

 the steeper slopes of the side hills, where the force of the 

 corrasion was greatly diminished. By this time the bulk of 



