If this Google streetview is the spot, it does look like there is a gravel and grass airstrip on the east side of the highway
https://maps.google.com/maps?q=Muncho+Lake,+BC,+Canada&hl=en&ll=58.926426,-125.769875&spn=0.004441,0.01869&sll=47.272986,-120.882277&sspn=2.989087,9.569092&oq=muncho&t=h&hnear=Muncho+Lake,+Northern+Rockies,+British+Columbia,+Canada&z=16&layer=c&cbll=58.926449,-125.770794&panoid=onHlQfBu3STpxTDJvO3Oew&cbp=12,45,,0,0Opps, that's just a clear mowed shoulder. A little further on is this, complete with airplane and windsock
https://maps.google.com/maps?q=Muncho+Lake,+BC,+Canada&hl=en&ll=58.934001,-125.765905&spn=0.008969,0.037379&sll=47.272986,-120.882277&sspn=2.989087,9.569092&oq=muncho&t=h&hnear=Muncho+Lake,+Northern+Rockies,+British+Columbia,+Canada&z=15&layer=c&cbll=58.934123,-125.76591&panoid=S7Kvt7KnyTQys4wh1tb0SA&cbp=12,207.93,,0,0and across for the Lodge, there is an open area that is probably big enough - though doesn't look smooth enough
https://maps.google.com/maps?q=Muncho+Lake,+BC,+Canada&hl=en&ll=59.010114,-125.771506&spn=0.002237,0.009463&sll=47.272986,-120.882277&sspn=2.989087,9.569092&oq=muncho&t=h&hnear=Muncho+Lake,+Northern+Rockies,+British+Columbia,+Canada&z=17&layer=c&cbll=59.010033,-125.771509&panoid=FMOz6TtPocQi0rXcOJRLwQ&cbp=12,7.41,,0,0