METHODS 



I conducted stream surveys by walking the stream bank to 

 locate pairs of harlequins and later hens with broods. I 

 surveyed from June 19th through September 6, 1991. All the 

 streams surveyed were walked once through this time period. I 

 photographed and filled out Montana Natural Heritage Program 

 survey forms when I observed a harlequin duck. Otherwise, I 

 recorded a brief description of the stream and its potential for 

 harlequin duck habitat and problems incurred that suggest 

 possible reasons why harlequins are absent. Streams were 

 visually analyzed and a few water temperatures were taken. 

 RESULTS AND DISCUSSION 



Through the time period of this survey from June 19th to the 

 6th of September, 1991, I observed five harlequin ducks. The 

 five harlequins, three males and two females, were sighted on the 

 Boulder River in the Big Timber Ranger District (Figure 2). 1 

 recorded the date, time, specific location, and described the 

 stream habitat around the observed harlequin (Table 1). Seven 

 are given in the table, but two sightings I figured were 

 duplicate. They occurred just upstream and right after the 

 previous sighting. I obtained five stream temperatures (deg. F): 

 1) 44 deg. on Sixmile Cr.; 2) 50 deg. on the North Fork of 

 Sixmile Cr.; 3) 48 deg. on Cedar Cr.; 4) 50 deg. on Iron Cr.; 

 and 5) 52 deg. on Wounded Man Cr. The five temperatures were all 

 taken at noon (12:00 a.m.) out in the main current of the stream. 

 The five observations that 1 made are consistent with the 1990 

 survey. All observations were made on the Boulder River (Markum, 



