52 KEPORT OF COMMISSIONER OF FISH AND FISHERIES. [10] 



The head of the way and open center is protected by wrought-iron gratings, as shown 

 in plan and elevations. Either half of the way may be constructed and operated in- 

 dependently of the other half. 



Plate V. 



Figure 10. Outline plan of fishway on the Rappahannock River, near Fredericks- 

 burg, Va. Height of dam, 19 feet 6 inches. The inclination of this fishway is one 

 foot in three ; width of waterway, 7 feet. The discharge of water from the fishway 

 is close to the abutment of the dam, and the structure is completely protected from 

 ice and floods by its location behind the guard walls. 



Plate VI. 



Figure 11. Plan in outline to show location of fishway at Boshler's Dam, James 



River. 



Plate VII, 



Figure 12. Outline plan showing location of fishway at Canal Dam No. 4, Potomac 

 River. 



