28 The Ottawa Naturalist. [May 



river section; (3) Athabasca lake section, and (4) the Lower 

 Mackenzie section. The navigable river and lake shore line of 

 these sections have been arranged in tabular form in the sub- 

 jf5ined table. The figures are given in round numbers. 



Navigable Waters of Mackenzie Basix. / 



Lower Mackenzie river section: 



Mackenzie river, below Great Slave lake 1,000 miles 



Peel river, to mouth of Wind river 250 



Bear river 90 



Shore line, Great Bear lake 1,360 



Liard river 440 



Shore line. Great Slave lake 1,440 



Slave river, Fort Smith to Great Slave lake. . . . 200 



Total 4,780 " 



Athabasca lake section: 



Slave river, Athabasca lake to Graham landing. 100 miles 



Peace river. Slave river to Vermilion falls 220 



Shore line, Athabasca lake 560 " 



Athabasca river, Athabasca lake to McMurray. . 170 



Clearwater river 80 " 



Total.. . .' 1,130 " 



Peace river section: 



Peace river, Hudson's Hope to Vermilion falls .. 550 miles 



Athabasca river section: 



Athabasca river, Grand Rapids to McLeod river. 325 miles 

 Lesser Slave river and lake 115 " 



Total 440 " 



Total for whole Mackenzie basin 6,900 " 



The Athabasca river section has a length of navigable 

 river and lake of about 440 miles, on which steamers drawing 

 two feet of water may run. This includes the distance from the 

 mouth of McLeod river to the Grand rapids on the Athabasca 

 and Lesser Slave lake and river. 



This section is separated from the Athabasca lake section 

 by 90 miles of rapids on the Athabasca river, extending from 

 Grand rapids to Fort McMurray, which is navigable with 

 difficulty for scows and canoes. Navigation of this section of 

 waterways will soon be done away with on the completion of 



