77 



(24 km.) below Whitehorse, the stream has 

 an average current of about 4 miles (6-4 km.) 

 per hour. Below this to the lake, the water 

 is rather slack, and the bed and banks of the 

 river are chiefly clay and sand. Through- 

 out this distance the valley is bordered on the 

 east by a prominent range of white bare hills 

 of Devono-Carboniferous limestone. 



123 m. Takhini River — About 13 miles (21 km.) 



196 km. below Whitehorse rapids, the Lewes is joined 

 by Takhini river on its left limit. This stream 

 at average low water in summer has a discharge 

 of about 3,600 cubic feet (102 cu. metres) 

 per second or about one-half that of the Lewes 

 above the confluence. 



136 m. Head of Lake Laberge — Altitude 2,050 



218 km. ft. (623m.) — The valley of the Lewes at the 

 head of the lake is occupied by low swampy flats 

 and terraces composed, where cut by the river, 

 of fine, in places iron-stained, post-glacial, 

 stratified sands, overlying glacial silts. 



Lake Laberge [13, p. 15] is irregular in out- 

 line, has a north-northwesterly trend, and is 

 31 miles (50 km.) long and about 2 to 5 miles 

 (3 to 8 km.) wide. This body of water is really 

 only a stretch of Lewes river which has become 

 expanded as a result of damming, and possesses 

 consequently almost no perceptible current. 

 Conspicuous, white, Devono-Carboniferous lime- 

 stone mountains extend along the eastern 

 side of the lake, and attain levations of about 

 2,000 feet (600 m.) above the water at a distance 

 of 2 or 3 miles (3 to 5 km.) from the shore. 

 Toward the lower end of the lake, the limestone 

 hills rise more abruptly from the water's edge, 

 but are there only from 400 to 1,200 feet (120 

 to 360 m.) high. On the west Lake Laberge 

 is bordered by gently sloping hills which attain 

 heights of 2,000 feet (300 m. ) above the lake 

 some miles inland and are nearly all wooded, 

 presenting quite a contrast to the white treeless 

 hills facing them on the east. The rocks on 

 Richthofen island and all along the western 



