You can see how well we're staying afloat next week by checking that live data report from the USGS:
http://waterdata.usgs.gov/nwis/uv?site_no=12355500

Dad is hoping for around 2000 CFS. Based on the data for the last 8 days, I think it should reach that just when we put in on the 31st. It depends on whether it rains in the next week, and how warm it is (which will influence how quickly the glaciers and snowpack melt). If it is a lot higher than 2000 CFS, it can make negotiating the log jams more treacherous. But also more exciting...
Speaking of melting glaciers, it looks like the mean water temperature is 15 degrees C. Which seems down right balmy for melted snow. But keep in mind the gage station is in Columbia Falls, and we're going to be upstream of there. Closer to the source, and therefore likely to be colder water. I think Mike is bringing a wetsuit for the guy in the kayak...