As judged from the rocky character of the Bad River 

 watershed, the main river and its larger tributaries such as the 

 White, Narengo, and Potato Rivers probably contain large amounts 

 of spawning habitat. Complete and partial barriers may be present 

 in relatively inaccessible areas. 



Electrical control devices are recomiaended for all streams 

 with a productive potential. Control will be rendered difficult due 

 to the relative inaccessibility of Morrison Creek and Creeks 3 and 

 k, to the large size of the Bad River, and to the high degree of tur- 

 bidity of several of the streams. 



Bayfield County ; A total of 10 streams was surveyed, but exaraina- 

 tion was incomplete because of almost continual heavy turbidity. 

 Several of these streams can probably be utilized by sea lampreys. 

 At least 2$ streams were not examined because of the turbidity 

 factor. 



Dauglas County ; At least 38 watersheds are present} none was ex- 

 aminad because of continual heavy turbidity. Several can probably 

 be utilized by sea lampreys. 



Apostle Islands ( Ashland County) : Not examined; may contain several 

 small streams suitable for sea lamprey spaiming. 



Almost all of the Wisconsin streams flowing into Lake 

 Superior are affected by rapid fluctuations in water levels and ex- 

 tremely heavy turbidity (lake clay). The latter condition appears 

 to accompany even light rains, and as a result the streams are often 

 turbid for weeks, 



Thr present study was greatly hindered ty both conditions. 

 Only limited portions of the larger watersheds could be examined, and 

 these relatively ineffectually. Adult lampreys and nests, if present, 

 were of course, not observed. Stream bottoms were visible only in 

 isolated instances. The turbid condition could well account for the 

 lack of reports concerning sea lamprey spawning along the Wisconsin 

 shoreline. 



Electrical control techniques are practical in these streams, 

 but construction, operation, and maintenance will be impeded by both 

 turbidity and water level fluctuations. It is recommended that an 

 effort be made to determine the bottom conditions of the remaining 

 streams only during the periods when they are clear, and that mechan- 

 ical control devices be constructed initially on certain streams to 

 ascertain the extent of sea lamprey spawning runs, if any. 



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