Historic stream flow values over the past 10 years also are 

 presented for both rivers (Table 3) . Water quality as determined 

 by clarity remained high throughout the survey period although 

 the water was slightly cloudy during the highest flows in May. 



Table 2. Monthly average, maximum, and minimum stream discharge 

 (cfs) for the Boulder and Gallatin rivers, May-Sept 1990 (USGS, 

 Helena, MT) . 



Boulder Gallatin 



mean 723 1498 



May min 369 866 



max 1960 2740 



mean 2206 2904 



June min 958 1980 



max 4220 4800 



mean 1227 1250 



July min 327 730 



max 3490 2500 



mean 206 577 



Aug min 119 471 



max 316 714 



mean 119 418 



Sept min 75 378 



max 194 484 



Other Wildlife Observations 



Dippers ( Dolichonyx oryzivorus ) were common on all streams 

 with the exception of Taylor Creek. Common mergansers (Mergus 

 merganser ) were observed on the East Boulder, West Boulder, 

 Stillwater, and Gallatin Rivers. No more than three common 

 mergansers were seen on any one survey day with the exception of 

 21 August when a group o 25 and another group of 10 flightless 



16 



