Hey William,
Taking care of your feet while hiking is pretty important. Dry are happy feet, wet feet are blister prone. Try, at all costs, to avoid wet feet in the first place. Here are the steps I take during mountaineering or hiking trips: 1] Start with a really decent pair of quality hiking boots with a high leather upper [with lots of ankle support] and a tough, burley sole; 2] wear two pairs of socks - an ultra thin polypro layer followed by a good wool sock [SmartWool]; 3] Wear gators - short nylon ones in summer, taller gore-tex ones the rest of the year; 4] clean and waterproof your boots often.
Well waterproofed boots and gators will get you through almost anything and everything. For truly epic water crossings, you have three options: find another route around, take it like a man [walk quickly, cinch the gators in tight, and find the shortest route across], or if the river bed is safe [though I don't recommend this] barefoot it.
Regardless of whether your feet are dry or wet, when you get to camp, make sure your dogs are dry, toss a little foot powder on them [take a little bit in a tiny zip-loc] and throw-on some clean, dry socks. Try to dry those boots out, I rarely have a fire in the places I go, so I'll lace them up a tad looser and my own body heat will dry them pretty quickly. If it's really cold [i.e. freezing], toss 'em in your sleeping bag at night. In the summer, I often bring a pair of Chaco sandals for around camp [on hiking trips] so I'd put them on if I had to cross a big river.
The most hardcore mountaineers in the world [with balls the size of pumpkins] will always look after their feet - no matter what so it's not a stupid question.