You load the barge with supplies and the animals, and set off down the river in the weak afternoon sun. After an hour or so the barge finds a good spot to go to shore, and everyone disembarks and gets ready for the journey. Grumblejack in particular is happy after getting off the cramped little barge, and is looking forward to getting some exercise (he pats the greatsword he's wielding as he says that).
There's a fair bit of snow on the ground, varying between ankle-deep to knee-deep for the average person, wet and heavy near the river but fairly powdery and light as you get inland. You don't get far before the daylight begins to fail, and you make camp underneath an impressively tall tree.
The maps aren't too detailed, but between them and the pace you managed today you're estimating arriving between afternoon on the third day and noon on the fourth, and that's if you don't run into any trouble on the way there.
What's a wilderness trek without some Survival rolls, to see if we stumble on any nasty critters? I'm thinking 3 team checks with the highest bonus, plus one from each just for shits and giggles.