Client:
Alaska Electric Light & Power CompanyLocation:
Alaska, United StatesDuration:
2 YearsScope of Work:
The Norwegian Lake Tap Method was successfully used to tap into the side of Lake Dorothy to allow the construction of a downstream dam.
Redpath USA Corporation (RUSAC) successfully tapped into the side of Lake Dorothy 36.5 m (120′) below the lake surface. The lake tap allowed water to flow into an access tunnel from the lake, lowering the water elevation below its natural outfall, enabling the construction of a downstream dam.
The Lake Dorothy portal site and tunnel are located approximately 25.7 km southeast of Juneau, AK, in the remote Tongass National Forest at an elevation of 701 m above sea level in the mountains above the Taku Inlet. Thirty-degree, snow-covered mountainsides and limited access by helicopter were just two of the many factors which challenged this unique project.
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30 DEGREE SNOW-COVERED MOUNTAINSIDES |
36.5 m BELOW THE LAKE SURFACE |
250 m HORIZONTAL ACCESS TUNNEL |
