This is 2 decade old info, but: The rivers were at maximum melt in July, so expect to scout the fords... hint: in Bear Creek, we tried to cross unsuccessfully at the trail, then downstream found a large boulder & on the downstream side was below the knee as opposed to above waist deep at trail. at Evolution creek, we crossed at the widest part above the rapids that was slow but also over waist deep. With trail under snow in the passes, we would have to send out advance search parties who would sing out "trail!" whenever we saw a cairn or tread emerging from snow, thus it's more useful to have several in your party or join up with other hikers. Back then you could expect not just snow fields, but heavy duty suncups in the melted July afternoon snowfields.... it was like a 3 stooges, slipping repeatedly, so yes some half or semi crampons & iceaxe might be helpful. Take advantage of whatever bear campsite bear boxes you can, then hang or canister your food so you don't end up with a massive bear in your tent with you as I did (actually, on top of my tent & me) trying to get my bags of candy bars.
gingerbreadman