Forest Service report 1947 p 98 The fkst development was constructed Ln 1913 A flood In October 1936 destroyed the dloerslon dam and part ol the conduit The present Installation Is as follows A dam 12 ID: 878316
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1 Geology -Continued. Forest Service repo
Geology -Continued. Forest Service report (1947, p. 98): The fkst development was constructed Ln 1913. A flood In October 1936 destroyed the dloerslon dam and part ol the conduit. The present Installation Is as follows: A dam 12 feet hlgh has a crest at the 71. 1 foot elevation. The water Is diverted through a conduit 1,427 feet long to a power house at the 18-€mt elevation. In 1947 or 1048 a flood destroyed part
2 of the conduit and damaged the left sid
of the conduit and damaged the left side of the dam. Qioce then the Sltka Fublic Utilities has purchased thek power from tbe Alaska Native Servlce diesel plant on nearby Japonski Island and have madg no attempt to repk either the dam or conduit. The power house with its machinary has been put In storage status. AbolLt 1042 tbe Sith Fublic Utlllties then the valley It Lake. AmLher pos8IbLe source is the delta of the M
3 edvetcha River. H~W~W, the delta is enti
edvetcha River. H~W~W, the delta is entirely below high tide level. . It should be noted that tbk area Is in an earthquake zone, although not a particularly active one. The dam should be constructed to minlrnlze possible earthquake daplage. TUNNEL ' Fropospls for the development of Blue Lake power include a tunnel at an altltude of about X)O ft born Blue Lake to elther Bering Cove or the mouth of the Medvetcha Rlver. T
4 he former ,would be about 8,000 ft long,
he former ,would be about 8,000 ft long, the latter about 7,000 It long. Eltber tunael woulB en- counter aimllar geologic conditions. All oi the rocks to be encountered In the tunnel can be expected to stand well for an b- definite perlod. However, in these rocks numerous faults, from a few, inches to as much as 4 or 5 ft wide, can be expected at intervals averaging about every 100 or 150 ft. The material - in these fa
5 ults will be soft and claylike and the t
ults will be soft and claylike and the tunnel wau may have to be llned at these places in order to prevent cavbg and consequent plugging of the tunnel. The greenstone is a $iwticularlg solid rock and few isults or fractured zones will be encountered. More zones of weshess can be expected in tbe other rocks. It can be expected that the rocb throaghout the tmelare tlght and will not leak any appreciable quantity of water