93 



1,380 feet (420 m.) above sea level and a sounding taken 

 about the central part of the lake gives a depth of 537 feet 

 (163 m.). The river connection between the lakes is 

 about 20 miles (32 km.) long, the lower 11 miles (17 km.) 

 following a valley parallel to Upper Arrow lake, while the 

 upper nine miles (14 km.) lies in a transverse valley which 

 cuts across the axis of a mountain ranges trending north- 

 west. 



Upper Arrow lake has a northerly trend and is about 36 

 miles (58 km.) long with a prominent northeast arm 10 

 miles (16 km.) long. The lake has an average width of 

 two miles (3-2 km.) and the low water level is 1,384 feet 

 (422 m.) above the sea level. Two soundings one 12 miles 

 (19 km.) north of the lower end of the lake, and another 

 four miles (6-4 km.) north of Halcyon, give 490 and 720 + 

 feet (149 and 219+m.) respectively. 



From Arrowhead to Revelstoke Columbia river trends 

 N. 35° W. and is a navigable stream for shallow draught 

 steamers. The river meanders with blind channels 

 through flat bottom land from i to i -5 miles (i -6 to 2 -4 km.) 

 wide. For six miles (9-6 km.) above Arrowhead low flats 

 border both sides of the river. Above that point they lie 

 alternately on one side of the river or the other. Below 

 Revelstoke the river closely hugs the rocky western shore. 

 The valley is continuously bordered on both sides by 

 mountain ranges and is in that respect analogous to the 

 valleys of the lakes to the south. 



The shore line of these lakes is steep with numerous 

 rocky bluffs; occasionally portions are fringed by narrow 

 beaches and locally by more widely expanded delta 

 deposits at the mouths of entering streams. The bordering 

 mountain ranges are lofty and rugged and attain elevations 

 from 6,000 feet (1,828 m.) to over 8,000 feet (2,438 m.) 

 above sea level. Their axial lines are narrow and lie from 

 four to six miles (6-4 to 9-6 km.) inland from the valley 

 trench. In places the steeper slopes are scarred by land- 

 slides, the most recent one having occurred early in 1903 on 

 the north side of the valley of the northeast arm a little to 

 the east of Arrowhead. 



The usual types of fiord topography are in evidence 

 throughout the length of the two lakes, illustrating varied 

 examples of cliff walls, truncated spurs, hanging and V- 

 shaped lateral valleys, terraces, alluvial cones and fans and 

 continuous evidence of heavy glacial scoring and under- 

 cutting. 



