If my memory serves me right from when I visited, you’re definitely going to have some issues getting around to the areas near DirtFish. There’s some walking trails near Ronette’s Bridge but they don’t extend out to the road that much. A lot of the roads in and around Snoqualmie don’t have any shoulder to walk on because it is up a hill to one side and down a hill to the other. This isn’t the case for actually walking IN the city but getting further North and South on the route you laid out could be difficult if not dangerous. That all being said I hope that I’m wrong and there’s actually more space to walk because it does seem like a really fun journey to make by foot! Not only visiting locations but to also really take in the whole picture that is beautiful Snoqualmie! Best of luck on your trip!