with a moderate shrub component. The main stem of Callahan Creek 

 is similar with features more pronounced. Large canyons, greater 

 than 50 ' high, with willow-gravel flats characterize this main 

 stem, resulting in a local name of "The Callahan Canyons". 



Scattered unconfirmed sightings of harlequins on Callahan 

 Creek have been reported throughout the years. Our sightings 

 verify speculations that the Callahan stream system hosts a 

 breeding population of harlequin ducks. 



Kootenai Falls - Three Rivers District (KNF) 



Kootenai Falls continues to be a gathering or a staging area 

 for harlequin ducks during spring migration. During the 1990 

 survey we sighted 1 male on May 17 loafing on a rock below the 

 main falls and 2 males on May 20 loafing above the falls on the 

 rock terraces. We did not observe any other harlequins during 

 later surveys. 



The number of harlequins sighted in 1990 at Kootenai Falls 

 is lower than in 1989. During the 1989 surveys 10 sightings of 

 harlequins were made, with a minimum of 6 individuals (4 males 

 and 2 females) identified (Kerr 1989) . In 1990 we sighted only 3 

 harlequins, all male, and a minimum of 2 individuals. We do not 

 know if this decrease in sightings is reflective of a decrease in 

 returning population, a normal fluctuation in the population, a 

 change in migration patterns, or is a function of survey success. 



The water level of the Kootenai River is controlled by Libby 

 Dam, located 16 miles north of Libby. The water level, usually 



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