Like wallz said if there is anything it will be in Smithers.
I am 100km west of PG and it takes me ~6.5-7hours to get up to Stewart (in the summer).
Why are you moving to Stewart? Things are pretty slow up there right now.

Just did a quick search on Smithers
Aspen Motor Inn says it has a pool.
http://smithers.travel.bc.ca/listing...tor-inn/20025/