Going by the clues that I can see.
"Old 577" Could refer to a California Masonic Lodge:
http://www.westmiltonlodge.org/wmblog/masons-of-the-old-west/
In Milton California which is just over a two and a half minute drive from North Fork. Thus the "North Forkers."
It might have something to do with a fly-fishing club in that area since
"Smolting" also refers to a young fish:
https://en.wikipedia.org/wiki/Juvenile_fish
So maybe it has to do with some guys who are Masons and like to fish and use snowmobiles?
Possibly the "Sleding" is an inside joke?
Looking at that website it does look like a beautiful area that probably does use snowmobiles in the winter
http://northforkcalifornia.com/northfork.htm
It is also interesting that Tucker Sno-Cats were once made in Grass Valley, California. This is also in the Sierra Nevada mountains.
http://www.sno-cat.com/about.html
Alternatively: (And this is really far out)
This may have something to do with a Linux Club organization that does (or did) operate out of the Sierra Nevada Mtns. from North Fork which is a small unincorporated community in the mountains of central California:
https://en.wikipedia.org/wiki/North_Fork,_California
577 is an unassigned area code that they may have used in communications. They may have been part of a now defunct operation called:
Smolt = Smolt was a computer program used to gather hardware information from computers running Linux, and submit them to a central server for statistical purposes, quality assurance and support. It was initiated by Fedora
That community has had computer classes:
http://sierranewsonline.com/basic-computer-classes-at-oakhurst-library/
Does anyone know if there was a model 577 Tucker Sno-cat?