During the period January-May, 19l;8, a wooden dam, 60 feet 

 wide and S 1/2 feet high, was constructed on this location. The 

 wall of the dam was constructed of a double row of 2 inch by 

 6 inch tongue and groove planks supported by heavy, round, wooden 

 timbers. A spillway, 15 1/2 feet wide., 2 feet deep, and 9 1/2 feet 

 long carried the water passing over the dam (Figure 59) • In addi- 

 tion to appropriate bracing timbers, the dam wall was strengthened 

 by piling large rocks against the downstream side. 



The trapping device was composed of a sloping screen and a. 

 trap box. 10/ The former consisted of a 1 l/2 inch angle-iron frame, 

 l5 1/2 feet long and 30 inches wide, over which two layers of wire 

 screen were stretched taut with a hydraulic jack; the lower layer 

 was of l/2-inch mesh, heavy gauge hardwire cloth (for support), and 

 the surface layer was of l8 mesh/inch copper screen. This screen 



Figure 59. — Carp Lake River dam and inclined-screen- trap in opera- 

 tion during warmer months. June, 19U8. 



10/ Functional design adapted from plans provided by Mr. Philip Wolf 

 of Malraoe, Sweden. 



- 157 - 



