I have no real data here, but I think there would be a slight change in flows between peak and low, and probably occurring a few hours after the peak and low temperatures for any day. However, I doubt the flows would change significantly enough to make it worthwhile to try to time your crossings.
If you are going up the North Fork, the best way to avoid the stream crossings is to go up the
Rockwell shortcut, which stays on the north side between the first and second stream crossings, below the Ebersbacher Ledges. That shortcut requires a short section of third class climbing up a broken crack in the granite, and then walking a narrow ledge that can be more intimidating than the Ebersbacher ledges.
