local usage. Many minor streams have no namesj 

 hence they are identified only by number. 



Stream number . — This number appears on 

 the right side of the first line of the heading. The 

 letter preceding the number designates the adminis- 

 trative district in Southeastern Alaska: e. g. , "E" 

 for Eastern. Continuity of stream numbers along 

 a shoreline is followed where practical. Due to the 

 numerous islands, breaks in the sequence have been 

 necessary. A catalog number combining numbers 

 and letters designates a minor stream, either adjacent 

 to or between major streams numbered in sequence. 

 For example, stream number 28A is a minor stream 

 adjacent to major stream number 28. 



ADF Statistical number. --A space for the 

 new ADF Statistical number is provided for use when 

 the new numbers are assigned. 



Latitude and longitude. — This appears on • 

 the second line, left side, of the heading. Location 

 of streams is given by the 'Be of "N" for north lat- 

 itude, and "W" for west longitude, stated in degrees 

 (* ), and minutes and tenths of minutes ('). Location 

 of the high tide point on the stream is given for 

 positive Identification. 



Geographic location. — This appears on 

 the third line of the heading. Each stream location 

 is described by the administrative district, major 

 channel, bay or inlet, arm or cove, and location 

 within the smallest division given by direction 

 (from true north) and distance (nautical miles). 



Major species . — Included are those species 

 of salmon which furnish the bulk of spawning in 

 the stream. Where more than one dominates, both 

 (or more) are included. 



Other species. — This indicates other known 

 species of salmon and trout using the stream. 



Escapement timing. — The timing is based 

 on systematic stream survey records, which include 

 a number of years of surveys with visits before, near, 

 and after the peaks of abundance. Extensive stream 

 temperature studies were conducted in conjunction 

 with most of these surveys. The earliest runs of 

 salmon occur along the colder mainland streams. 

 The latest runs are in the outer channel and coastal 

 areas where stream levels depend on rainfall. An 

 intermediate timing of the runs occurs in the region 

 lying between the mainland and outer coastal 

 areas. Three major time divisions indicate the peak 

 period that the major species are found in the stream. 

 "Early" designates peaks before August 15j "middle," 

 peaks between August 15 and September 15} "late, " 

 peaks after September 15. The range of time in 

 which the major species are found in the streams 

 is given by months. 4 



Spawning facilities. — This includes a gen- 

 eral classification rating of poor, fair, good, excel- 

 lent. The rating is based on estimates by various 

 individuals. 



Stream temperatures . — In this classification 

 the following general ranges are used for each 

 stream. Each range is for the 3-month period (July, 

 August, and September) when most salmon spawning 

 migrations occurj 



Cold-range, averaging less than 50* F. , 

 usually an early -run stream. 



Normal-range, averaging between 50* 

 and 55* F. , usually a middle-run stream. 



Warm-range, averaging over 55* F. , usu- 

 ally a late-run stream. 



These ranges generally correspond to the 

 geographic location of the stream and time of the 

 runs. Where only limited temperature information 

 is available for a stream, the range has been esti- 

 mated from its location and timing of run. Cold- 

 range streams are usually found along the mainland 

 or on the larger islands in the northern part of 

 Southeastern Alaska. Warm-range streams are usu- 

 ally found along the outer channels and coastal 

 areas, which are dependent upon precipitation as 

 the primary source of supply. The normal-range 

 streams appear to fall geographically between and 

 may combine characteristics of both cold- and 

 warm -range streams. Timing of the salmon run , 

 especially pink salmon, also follows the geographic 

 distribution outlined above. Recording thermograph 

 data, available from a number of streams with 

 known escapement timing, have been used as a 

 basis for comparison. 



Valley description. — Glacial, stream-cut, 

 describe valley origin with a general description of 

 the outstanding features such as length, width, 

 timber, slopes, directions. They have been 

 obtained from aerial photographs and by direct ob- 

 servations. 



Drainage area. — This has been either esti- 

 mated in square miles or computed with a polar 

 planimeter from aerial photographs. Estimates of 

 the drainage area of large systems have been taken 

 from the small-scale, key, composite photographs 

 and are less reliable. Data from Water Power of 

 Southeastern Alaska 1947 are included when available. 

 Descriptions are given of supply sources, drainage 

 topography, and characteristics governing water 

 quality and temperature ranges during spawning from 

 the editor's interpretation of aerial photos and local 

 knowledge. 



