The geology, surface features, and stream characteristics 

 of St, Louis County are, in general, similar to those described for 

 Cook County, 



Control operations will be aided by the relative accessi- 

 bility of all streams. Installation and operation of devices will 

 be impeded by rapid fluctuations of water levels. Those streams 

 situated in the center of Daluth will present difficulties unique 

 to them alone. 



Several of the St, Louis County streams are probably 

 intermittent. 



The survey included all streams fran the Lake County bor- 

 der, south to Mission Creek which enters the St, Louis River ^st 

 belo-K the Fond du Lac Dam, which is a positive barrier in the St. 

 Louis River itself. 



Discussion 



Lampreys have been reported fran the St. Louis, Sucker, 

 and Knife Rivers in Minnesota in recent years. Although actual 

 spawning records are absent fran both Minnesota and Vlisconsin, the 

 persistent and general increase in scarring of lake trout and other 

 fish along both shorelines is an indication of actual utilization 

 of the local streams for spasming purposes. 



Lampreys are occasionally taken by canmercial fishermen 

 of both States, although reports are scanty. As many as 10 percent 

 of the fish in certain catches have been scarred. It is likely 

 that the sea lampreys which cause the scarring would attempt to 

 use the local streams for spawning (unless the scarred fish migrated 

 from the eastern portions of the lake where large lamprey popula- 

 tions are known to exist). 



Many streams in Wisconsin appear to be suitable for sea 

 lamprey spawning, even as judged from the inadequate examination 

 of 19^2. Minnesota streams appear to be generally less suitable, 

 as determined from a much more thorough examination. Nevertheless, 

 at least 22 of the 106 streams examined along the north shore of 

 Minnesota are considered to be quite suitable for spawiing, despite 

 the fact that some of them contain barriers a short distance above 

 the mouths or are subject to rapid fluctuations in water levels. 



All of the suitable streams in both Wisconsin and Minne- 

 sota and <il30 those considered to be marginal should be rechecked 

 in the future to deteimine the actual extent of utilization by sea 

 lampreys. (Rechecks of certain Michigan streams surveyed in 1950 

 Ixave revealed a slight increase in the numbers of nests present). 



32 



