Maybe just me, but this is some of the scenes one would really like to see in real action when it was all operational. I've ploughed through a fair amount of literature and I'm pretty sure this picture from 1969 is more or less shot from the same location - https://pbase.com/jakobe/image/95861825

Some 10M logs were transported this way annually and at first sight, one could just think that they leisurely passed all-year around. That was however not the case, as the flotation was a highly seasonal activity and the key was to work more or less 24x7 before the summer dry-up decreased the water flow.

The feed through this particularl flume was highly dependent on the inflow from the upper parts of the river and several sorting stations, dams and low water supply conditions could easily cause interruptions.

A fair guess would be that the flotation season at this flume was from June to September, let's say four months. That would require some 2.5M logs per month, i.e. an average of some 85,000 logs per day. Presumably at peak-days, the feed could easily exceed 100,000 logs per day.