Goat lake Pitchfork Falls

The Goat Lake Hydroelectric Project is located approximately 6.5 miles northeast of Skagway, Alaska. The lake is situated in a perched cirque valley at El 2925. The lake lies east and south of the Skagway River. The drainage basin for Goat Lake and Pitchfork Falls Creek includes 4.2 square-miles. The lake is fed by a glacier at its south end. The glacier covers about 1.7 square miles, contributing approximately 80-85% of its runoff to the lake. The glacier terminates near the south end of the lake in a coarse rubble moraine, consisting principally of large angular granitic blocks. The lake outlet, located about 300 feet north of the end of the moraine, flows through a bedrock notch and contributes the major portion of the water flow in Pitchfork Falls. After the falls this same water then joins the Skagway River.

Project Name Goat Lake
LIHI Certificate Number 26
LIHI Effective and
Expiration Dates
October 23, 2016
October 23, 2021
Owner Alaska Power and Telephone Company
State Alaska
Location Located approximately 6.5 miles northeast of Skagway, Alaska, situated in a perched cirque valley at El 2925.
Installed Capacity 4 MW
Average Annual Generation 12,701,000 KWh
Facility Type Storage project; block loaded, sometimes load following.
FERC No. 11077

The Goat Lake Hydroelectric Project is a storage project with a 4.0 MW capacity that is usually block loaded, but sometimes operated as load following. The lake is used as a reservoir without any dam. The lake continues to have an uncontrolled spillway using the original outlet. A siphon intake extends into the lake a horizontal distance of 369-feet to obtain 185-feet of submergence, or an elevation of 2740, potentially drawing the lake down to the approximate elevation 2885 at peak use, during the winter. The intake, consisting of a v-shaped wedgewire screen assembly, is connected to the siphon pump by a 30-inch-diameter high density polyethylene chloride (HDPE) penstock which changes to a 28-inch-diameter steel penstock approximately 82-feet before the siphon house. The siphon pump connects with a valve house via a 704-foot-long, 30-inch-diameter HDPE penstock. A catchbasin located at approximately 2,885-feet above mean sea level (msl) catches runoff from the glacier moraine that bypasses the lake. The catchbasin is connected to a pump back house via an 18-inch-diameter HDPE penstock.  The pumpback house draws water from the catchbasin and pumps the water back to the lake via a 16- inch-diameter, 640-foot-long HDPE penstock by using four pumps of various horsepower (HP). The valve house also has a 16-inch bypass flow pipe for when additional water is needed in Pitchfork Falls Creek at certain times of the year. A minimum of 8.5 cfs is required for visual concerns from May 15 – September 30 for 12 hours each day. This is operated via a SCADA system that measures flows and releases or stops releases when required. The valve house also has a 28-inch- diameter HDPE penstock to approximately the 2,610 foot elevation where the penstock transitions to a 24-inch-diameter steel pipe to the powerhouse. At the 990-foot elevation the penstock crosses under the historic White Pass & Yukon Route Railroad (WP&YR-RR) via an approximately 40-foot-long pipe conduit. At the 777-foot elevation the penstock passes through a 48-inch-diameter pipe conduit over the Skagway River, to the west bank, to the powerhouse, at 769-feet above msl.

The powerhouse contains one horizontal shaft Pelton turbine and associated 4.0 MW synchronous generator for a total installed capacity of 4.0 MW. A tailrace transports the turbine discharge approximately 70 feet to the Skagway River. A small substation is located adjacent to the powerhouse. A pole mounted 34.5 kV transmission line begins at the substation and parallels the Skagway River, following the west side for approximately 4,538 feet to a point across from Clifton and ascends to the distribution line from Skagway serving the U.S. Custom’s Border Station on the Klondike Highway.

The lake was stocked with grayling in 1994 by the Alaska Department of Fish & Game, the same year we filed a license application to the Federal Energy Regulatory Commission. After conducting a population survey in 2001-2002 we are currently monitoring the graylings access to their spawning stream to determine if the lake drawdown exposes any barriers to their movement into the stream to spawn. This (2005) is the third year of the five year study. To this point grayling have been observed in the spawning stream every year, indicating there is not a barrier to their movement when the lake is drawn down. Anadromous fish do not get closer than several miles downstream of the project tailrace due to a barrier falls. The penstock offers adequate measures to allow wildlife to move over or under it along its length. No species were considered to be impacted by the construction and operation of this project.

images(1)

Certification History

February 10, 2017: On February 8, 2017, LIHI Executive Director Shannon Ames announced a Preliminary Certification Decision that the Goat Lake Hydroelectric Project, LIHI Certificate No. 26 (FERC No. P-11077) continues to satisfy the LIHI Certification Criteria.  Once final, the effective certification date for the Goat Lake Project is October 23, 2016 for a five (5) year term, which will expire on October 23, 2021.

As provided for in Section 4.2.5 of the LIHI 2nd Edition Handbook, the Preliminary Certification Decision, along with the Application Reviewer’s report and (if prepared) report of the Executive Director, will be posted on the Institute’s Web page for 30 days.  Notice of the posting will be provided to all individuals or organizations that commented on the initial Application Package.

Any Commenter may submit a letter to the Executive Director requesting an appeal within the 30-day period.  The appeal request must state specific reasons why the hydropower facility should have failed one or more criteria.  Only individuals or organizations that commented on the initial Application Package may file an appeal.  Further information about the LIHI appeal process is available in the LIHI Handbook, available at http://lowimpacthydro.org/certification-program-html/.  If no appeal is requested within the 30-day period, which begins on February 10 and ends on March 10, the Executive Director will issue final LIHI Certification for the facility and post a notification of certification on the Institute’s website.

December 16, 2016: The Goat Lake certificate has been granted an additional extension of the current certificate term. The new expiration date is March 31, 2017. See the extension letter for explanation below.

September 12, 2016:  The Goat Lake certificate has been granted an extension of the current certificate term. The new expiration date is December 31, 2016. See the extension letter for explanation below.

August 5, 2016: On July 11, 2016, the Low Impact Hydropower Institute received a complete application for a new term of Low Impact Certification for the Goat Lake Hydroelectric project.  The application materials can be found in the Files section below.

LIHI is seeking public comment on this application.  Specifically, we are interested in knowing whether you think the Goat Lake project continues to meet the LIHI Low Impact Certification Criteria.  Please review the program and criteria in LIHI’s revised Handbook and then review the Project’s 2016 application materials posted on the project page.  Comments that are directly tied to specific LIHI criteria (flows, water quality, fish passage, etc.) will be most helpful, but all comments will be considered.  Comments may be submitted to the Institute by e-mail at comments@lowimpacthydro.org with “Goat Lake Project Comments” in the subject line, or by mail addressed to the Low Impact Hydropower Institute, PO Box 194, Harrington Park, New Jersey 07640.  Comments must be received at the Institute on or before 5 pm Eastern time on October 5, 2016 to be considered.  All comments will be posted to the web site and the applicant will have an opportunity to respond.  Any response will also be posted.

July 17, 2012: The Goat Lake Hydroelectric Project has been recertified as low impact for a five year term, effective October 23, 2011 and expiring October 23, 2016.

February 15, 2012: Alaska Power and Telephone has submitted an application for recertification of the Goat Lake Project. The original LIHI certification expired on October 23, 2011.

April 2, 2007: The Goat Lake Project has been certified as low impact for a five year term, effective October 23, 2006 and expiring October 23, 2011.

October 23, 2006: Alaska Power and Telephone has submitted an application for certification of the Goat Lake Hydroelectric Project.


Files:

2016 Re-Certification