Winter operations, 1970-1971 / John C. Ayers, Norbert W. O'Hara, William L. Yocum.

Ridge A at right against the shore, Ridge B in the center, remnants of Ridge C
and the first lagoon at left. This picture was taken on 5 March 1970.
On 16 March 1970 there was a badly wasted Ridge A at right, a modest
Ridge B in center, and at left a refrozen lagoon with remnants of Ridge C in
the left three quarter distance. These conditions are shown in Figure 35(148).
On 23 March 1970 the conditions along the Cook Plant's north shore were as
shown in Figure 36(154). In this figure scattered portions of Ridge A extending
above water can be observed along the right. Ridge B, shown in the center, was
low and heavily sand-laden. Isolated pieces of Ridge C are evident at the left,
with loose lagoon ice located between Ridges B and C.
Figure 37(164) gives the conditions along the Cook Plant's north beach on
30 March 1970 at the end of the ice season. A small ridge of sand parallel to
shore probably represents the sand thlat had been incorporated into Ridges A and B.
The ice departure at Cook Plant in the spring of 1970 was merely a quiet
melting-in-place, and did not produce shore erosion. However, this was not the
condition of demise that prevailed in the spring of 1971.
The Storm Demise
A strong storm on 19 March 1971 completely changed the pattern of the lake's
entry into the spring no-ice condition.
Figure 38(150) illustrates the ice conditions northward from the Cook Plant
construction site on 17 March 1971. Ridge A shows against the beach at right and
is heavily sand-laden; Ridge B shows in the right center and is also sand-laden,
though not to the degree of Ridge A; Ridge C still high and with some white-ice
augmentation extends to the right across the picture from left middle distance.
The ice of the first lagoon between Ridges B and C is broken.
Figure 39(152) presents a view northward along the beach from the Cook Plant
site on 22 March 1971. The remains of older ice ridges are on the beach, and the

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