602 U. S, BUREAU OF FISHERIES 



400 feet. The ladder is located about 100 feet out from the east 

 shore, and has a net heifj^ht of about 10 feet. Tlie construction work 

 was started late in October and water was admitted to the completed 

 ladder about a month later. A fine piece of construction was secured. 



During the fall the Washington State Division of Fisheries con- 

 structed a concrete fish ladder at the Prosser Dam at the lower end 

 of the Yakima River. The completion of the Prosser, Sunnyside, and 

 Wapato fish ladders now opens the Yakima River and its tributaries 

 for many miles to the ascending fish. 



8'pragv}& River fish ladder. — Conditions at the Sprague River Dam 

 of the U. S. Indian Irrigation Service near Chiloquin, Oreg., have 

 been set forth in the 1929 re])ort, together with an account of tlie 

 preliminary work done here. Last summer the bureau's engineers 

 prepared designs and specifications for the required fish ladder and 

 early in September a contract was let for this construction. The 

 work was completed late in the fall. The design follows the prin- 

 ciples displayed in the Sunnyside ladder and adapts itself to the 

 particular features of the dam and sluiceway construction at Sprague 

 River. This dam is 11.3 feet high. 



NEW AND PROPOSED POWER PROJECTS 



An important activity falling within the province of this investi- 

 gation has been in connection with a number of power developments 

 now under construction in the Northwest or pending license by the 

 Federal Power Commission. 



The major developments investigated and reported on in 1930 are 

 as follows : 



(1) Rock Island development of Washington Electric Co. on the 

 Columbia River, Wash. 



(2) Kettle Falls development of Washington Water Power Co. on 

 the Columbia River, Wash. 



(3) Flathead development of Montana Power Co. on Flathead 

 River, Mont. 



(4) Ariel development of Inland Power & Light Co. on Lewis 

 River, Wash. 



(5) Cascade Locks project (Hobson application) proposed for 

 Columbia River at Cascade Locks. 



(6) North River development of Western W^ashington Electric 

 Light & Power Co. on North River, Wash. 



At the Rock Island development, remarkable progress has been 

 made. The end of 1930 saw the completion of the power house and 

 spillway dam in the east channel of the river. By tliis time also, 

 the higii fish ladder at the power house had been virtually completed, 

 lacking only fitting up with entrance gates and the installation of 

 stop-log partitions between the pools. This ladder which is G30 feet 

 long is of heavy reinforced concrete construction. The pools are 20 

 feet wide by 10"feet long and the grade is 1 to 10. A very fine piece 

 of construction work has been done. 



Concerning the Kettle Falls development — a project of major size 

 proposed for the Columbia River- — examinations were made and con- 

 ference held with engineers of the power company and with the 

 interested State organizations. This led to the specification of the 



