Length accessible to salmon . — 

 Length of stream which red salmon 

 can negotiate. 



Average width . --In feet; deter- 

 mined by averaging several v.ddth 

 measurements made at various sections 

 of the stream. 



Watershed . --Lists (l) the drain- 

 age area in square miles,. (2) a de- 

 scription of the watershed and its 

 source, and (3) a mention of any 

 obstructions in the stream. 



Gradient . --The change of eleva- 

 tion in feet per mile. 



Viidth range .— In feet; deter- 

 mined from all width measurements. 



Average depth . — In inches or 

 in feet; determined by averaging 

 the average cross-sectional depths 

 from several sections in the lower 

 area of the stream. 



Depth range . — Usually listed 

 in inches, but sometiiaes in feet; 

 the smallest and largest average 

 cross-sectional depths taken from 

 the lower area of the stream. 



Total accessible spavming 

 area . — Determined by the following 

 formula : 



Total accessible length in miles 

 X 5,280 X average width in feet 



U3,560 

 total area in acres. 



Potential spavming area . — 

 Given in percentage and acres; deter- 

 mined from ground surveys of the stream 

 based on such criteria as bottom com- 

 position, gravel size, water depth, 

 and water velocity. 



Bottom quality . — Expressed in 

 percentage composition of the 

 various size classes of material 

 in the streambed. 



sand, silt, cla 



^ 



<l/8" 

 gravel = l/8"-3" 

 rubble = 3" -12" 

 boulders = >12" 



Water velocity . — In feet per 

 second (fps); listed as an average 

 velocity and a velocity range. The 

 average velocity \ras computed from 

 several average cross-sectional 

 velocities obtained in the lower 

 sections of the stream. The velocity 

 range is simply the smallest and 

 largest average velocities obtained. 



Flow . — Volume in cubic feet per 

 second (cfs) . The flo\-; was usually 

 measured at or near the mouth. 



Flow range . 



--The smallest and 



largest flows obtained from a stream. 



Air temperature . — In degrees 

 centigrade; usually taken during 

 spasming ground surveys . The date 

 of observation follows the air tem- 

 perature figure . 



Water temperature . — In degrees 

 centigrade of the stream water; 

 usually talien during spa'^.'/ning ground 

 surveys. The date of the measurement 

 is given. 



Pools and riffles . --Lists the 

 general nature of the water flOT'j 

 of the creek. 



Red Salmon Runs 



Percent of total escapement . -- 

 The total number of red salmon in a 

 stream observed through 1 962 and 

 calculated as a percentage of the 

 total escapement into the entire 

 Wood River system over the same years , 



