Swinging for Montana trout this winter?

I don't think a jet boat would be of much benefit.
You do see the rare motorized craft on the Mo. but there isn't really much of a need for one.
Shuttles from Wolf to Craig are $22. The river can be chopped up into very short floats and honestly if you are going to swing you really don't even need a boat. There is endless water you can fish on foot.
That being said I usually drag my raft up there.

It fishes well all winter, even when water temps get down to 33-34 degrees.
Keep an eye on the weather, the NOAA site does a better job of being more accurate and site specific.
http://forecast.weather.gov/MapClic...=47.0744&textField2=-111.963&e=0#.VHN2ackhq6s

The area around Craig often gets up into the high 30's to high 40's all winter long.
Sometimes it even gets up into the 50's.
Keep an eye on the wind forecast. Anything sustained much over 20mph is going to be unpleasant. Sustained over 30mph is going to be miserable.
Strong winds out of the north will be awful but usually the wind blows from the south moving you down stream pretty easily in a drift boat.

I usually run the dam to Wolf, Wolf to Craig (the longest) or Craig to Stickney/Spite.
More often than not I float Wolf to Craig. It's only a little over 5 miles and I usually fish 5 or 6 runs for the day. There's plenty of time for that run, you could probably down row it in an hour and a half/two hours.

I usually fish a skagit with 10 feet of T-17.
I don't really swing, I make long casts and slowly strip back in. The fish, even in winter can be in surprisingly fast water but are typically concentrated in the deeper slower runs. It's fairly obvious where the better water is.
Lot's of people throw scandis and just swing. I actually think that's not as productive but whatever, there are plenty of fish around.

They don't fight all that hard in the cold water even though they are in great shape. You could easily find two good areas to fish and spend all day on them given that there a gazillion fish per mile.
It actually gets kind of boring. I typically expect to catch between 20-30 in a day. 10-15 would be a slow day. They are nice fish though and you can expect to get into a few rainbows in the 20-22" class. Most are fat 16-18".

Smallish streamers in size 4-6 seem to work best. They love the Kreelex, it's like rainbow candy.

Any other questions contact these guys;
http://www.headhuntersflyshop.com/blog-fishing-report/