Dyche. — Fishways and Dams 303 



For frame supports : 



90 lineal feet of 2 in. by 12 in. planking. 

 18 lineal feet of 2 in. by 10 in. planking. 

 60 lineal feet of 6 in. by 6 in. timbers. 

 68 lineal feet of 4 in. by 4 in. scantling. 

 12 bent iron plates 4 in. by % in. by 12 in. 



3 iron straps 6 in. by ^ in. by 9 ft. 6 in. 



6 bolts 5/16 in. by 11 in. 



6 bolts 5/16 in. by 16 in. 

 18 bolts 5/16 in. by 9 in. 

 Spikes as needed. 

 Rock for piling in and around supports. 



Estimated cost of material for the above structure: 



Lumber $52.00 



Iron work and bolts 35.00 



Spikes 12.00 



Total $99.00 



This fishway may have as many twists and turns as a 

 stairway, and may be built anywhere over the dam where 

 the depth of the water would be sufficient. It may even be 

 built around one of the end abutments. The slope of one 

 foot to five must, however, be preserved. In practice, some 

 of these fishways have been constructed of cement, others 

 of steel, and others of a combination of these materials. 



