Our first day on the river was fine in the stretch between Mount Hersey where we put in, down to almost Woolum. The river was plenty high for floating or should I say paddling as the current was sluggish.
Below Woolum things literally got rocky in a fully loaded canoe. A friend in a kayak who was part of our party had an easier time of it but even he had to get out and pull his kayak through several spots. In most stretches, where you expected the water to move and provide a little excitement, you had to get out and pull. It got old.
Below Baker's Ford, the water level improved and there was little really low water, but the current was still pretty slow all the way down to Gilbert.
It's hard to knock the Buffalo because it's so beautiful regardless of water conditions, but I'd keep my canoe light and consider day trips until they get some rain.
Gilbert is a great place to base camp. Buffalo Canoe and General Store is a nice place with some cabins and campgrounds. Be sure to check out the great little restaurant in Gilbert.