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

Creek. AELP has a water ri ght for use of 74 cfs dati ng from 1915 (ADL
45781). A copy of the water right certificate is included 1n Appendix E-2.
No additional uses are proposed for Annex Creek.
2.1.2 Existing Water Quality
All fresh waters of Alaska not specifically classifled otherwise
are classified by ADEC as suitable for all potential freshwater uses, including:
(1) water supply for drinking and food processing,. agriculture,
aquaculture and industrial uses; (2) water recreation; and (3) growth and
propagation of fish, shellfish, other aquatic life and wildlife including
waterfowl and fur-bearers (ADEC, 1979). Criteria corresponding to each of
these uses have been developed by ADEC and are included in Appendix E-4;
together the criteria and classification constitute the water quality standards
established by ADEC.
Although no data are available on Annex Creek or Annex Lakes due to
the absence of any development other than the hydroelectric generating facilities
in the watershed, it is likely that the quality of these water bodies is
excellent. Seasonal variations in temperature and chemical water quality are
probably similar to those of other surface waters in the Juneau vicinity,
including Salmon Creek and Salmon Creek Reservoir, described in Section 2.2.2
below.
2.1.3 Impacts of Continued Operation and Protective Measures
Since neither changes in operation nor new construction are proposed,
continued operation of the Project will not alter present water use or
quality. The current license contains articles designed to protect water
quality. Protection of water quality and fish habitat is accomplished by
Article 41 (of the 1963 license), which requires that erosion and siltation
due to Project construction and operation be minimized.
2.2 SALMON CREEK COMPONENT
2.2.1 Existing Water Use
Hydrology. The hydrology and operation of the Salmon Creek. Component,
described in detail in Exhibit B, are summarized briefly here to provide back.­
ground information. Limited streamflow data are available; therefore, most of
the description is derived from synthetic hydrological modeling. Mean monthly
inflow into the Salmon Creek Reservoir from its 5.2-square-mile drainage area
is estimated to be 63 cfs; ranging from 0 to 227 cfs.
Data collected from July 1911 through October 1912 are included in
Appendix E-4 and provide an indication of what the typical pattern of Salmon
Creek flow would be in the absence of the reservoir. Even in the driest month
in this period, flows generally exceeded 4 cfs at the dam site.
E-8