Before the FERC Application for New License for the Annex Creek ...

ANNEX CREEK/SALMON CREEK HYDROELECTRIC PROJECT
FERC NO. 2307
INFORMATION PACKET FOR
PREFILING CONSULTATION - INITIAL MEETING
January 17, 1985
Introduction
This packet of information has been prepared to initiate the formal
prefiling consultation required by regulations of the Federal Energy Regulatory
Commission (FERC) for relicensing of the Annex Creek/Salmon Creek Project
(Project) and has been sent to all agencies listed in Attachment A.
Following the scoping meeting, agencies with jurisdiction over
resources or expressing interest in the relicensing will be contacted for
additional information and discussion. Our goal is to address and resolve all
issues prior to completion of the draft license application, which will be
submitted to all of the agencies listed in Attachment A. Agencies will have
60 days to comment on the draft application. The application will be finalized
and filed with FERC by August 31, 1985.
Project Description
The Project includes existing developments at both Salmon and Annex
Creeks. Locations of the facilities are shown in Fig. 1.
The Salmon Creek facility consists of a l65-foot concrete arch dam
which forms a reservoir with a maximum capacity of 19,000 acre-feet. Water
from Salmon Creek Dam is conveyed downstream to the Upper Powerhouse by a
4,477-foot-long steel pipe. Before reaching the powerhouse the penstock
divides into a wye branch which diverts the water either to the Upper Powerhouse
or to another penstock leading to the Lower Powerhouse. This flow is
controlled by two butterfly valves. The Upper Powerhouse contains two 2,500-
horsepower impulse wheels directly connected to a 1,400-kW generator. The
rehabilitation of the Lower Salmon Creek Hydroelectric Facility that was completed
in December 1984 will provide an additional 2.8 MW of capacity and an
estimated 15,000,000 kWh annually.
The Annex Creek facility consists of a 20-foot timber crib dam
located at Annex Lake outlet. A l,420-foot-long t.unnel has been driven into
the lake, which provides a drawdown of 150 feet and 22,000 acre-feet of storage.
At the tunnel outletk a 34-inch pipe is used to control the water
supply. The penstock is a riveted steel pipe and is 7,273 feet long. Annex
Creek Powerhouse contains two units, each consisting of a 2, SOO-horsepower
impulse wheel, connected to a l,750-kVA generator. A 23-kV transmission line
extends 12.4 miles between Annex Creek and Thane.