drains most of six toimships. Its depth in the spring months 

 varies fron about 8 inches in the riffle areas to 9-5 feet in its 

 deeper pools. The river varies from 21; to 80 feet in width 

 during the same season. Throughout the upper third of its course 

 •VT±iere it flows through a chain of lakes ^ the ctirrent is predom- 

 inantly sluggish and the bottom silted. The balance of the 

 stream, flowing first through pastured land and woodlot, and then 

 through a wooded valley, is characterized by swifter currents and 

 bottom types of rock, nibble, gravel, and sand. 



In 19h7, sea lampreys spawned in varying concentrations 

 throughout the entire lower two-thirds of the river. The farthest 

 point upstream at which spawning occurred was 16. ^ miles above 

 the mouth (T3hK5 RiJ5, S.19). It is estimated (on the basis of 

 nest counts and specimen samples obtained) that between 10,000 and 

 11,000 sea lampreys entered the Ocqueoc River in 19l|.7. On the 

 same basis, it was estimated that 13,000 sea lampreys entered the 

 river in 19ii8. Of four permanent tributaries of the Ocqueoc River, 

 a small number of qea lampreys entered two, and spawned. These 

 were the Little Ocqueoc River and Silver Creek. The remainder, 

 Indian Creek and the Orchard Lake Outlet (tributary to Ocqueoc 

 Lake) did not contain subsidiary runs. 



(2) The Ocqueoc River sea lamprey vibIt 



In August and September, 19U8, a large sea lamprey weir with 

 both upstream and downstream traps and of a semi-permanent type 

 of construction, ivas installed in the Ocqueoc River about 1,000 

 feet (of stream course) above the mouth of the river. It is 

 located on the right-of-way of U. S. Highway 23 just above the 

 road bridge. This was the loivest practical point of construction 

 in the watershed. No potential sea lamprey spawning grounds exist 

 between it and the mouth of the river. 



Plans of this structure are too large and too detailed for 

 inclusion here. Briefly, its basic construction was as follows. 

 The weir is of the straight, 90 degree angle type, i.e., it is 

 btiilt straight across the stream at right angles to the current. 

 Its functional width (from solid abutment to solid abutment) is 

 80 feet. It is effective as a fish barrier to a hei^t of $ feet, 

 h inches above its own decko A downstream trap is located at mid- 

 stream in the weir and two upstream traps, each located midway 

 between the do-vvnstream trap and each abutment, are present (Figures 

 11, 12). 



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