95 



INTRODUCTION 

 The Montana Department of Fish and Game has monitored fish populations 

 in Clark Canyon Reservoir and its tributaries since 1964. The purpose of the 

 study was to determine the relative abundance of game and nongame fish within 

 the reservoir and to determine the influence of rough fish populations on 

 resident fish 1n tributaries to the reservoir. 



DESCRIPTION 

 Physical Reservoir Statistics 

 Clark Canyon Reservoir (Figure 1) was constructed on the Beaverhead 

 River in southwestern Montana during the period 1961 to 1964. The primary 

 functions of the reservoir are irrigation and flood control, The drainage 

 area for the reservoir encompasses 2321 square miles. At maximum water 

 surface elevation (5571.9 ft), the reservoir has a surface area of 6600 

 acres and a storage capacity of 328,979 acre feet. Morphometric charac- 

 teristics of the reservoir at the average operating level of 5540 ft are 

 given in Table 1. The maximum depth of 93.5 ft is located approximately 



TABLE 1. Morphometric data for Clark Canyon Reservoir at the average operating 

 level—elevation 1688.6 m (5540 ft). 



Maximum Depth 28.5 m (93.5 ft) 



Mean Depth 9.35 m (30.68 ft) 



Maximum Length 6.47 km ( 4.02 mi) 



Maximum Breadth 5.01 km ( 3.11 mi) 



Mean Breadth 3.06 km ( 1 .90 mi) 



Area 19.789 x 10 6 m 2 (4.890 x 10 3 acres) 



Volume 18 x 10 6 m 3 ( 150 x 10 3 acre-ft) 



Length of Shoreline 26.01 km (16.16 mi) 



Shoreline Development 1.65 



