On the 22nd of this month, taking advantage of a sunny day between the days of mist and rain, I walked out to the Wet Wood and found that the Long Dam had been breached.
Here is the breach
And here is the pool upstream of the dam.
Today I visited the Wet Wood again. A heron lifted off as I approached and a flock of mallard rose noisily and flew away. I found that the breach had been fully repaired and the water level of the pool was as high as ever. Why had the beavers breached the dam?
I remember seeing a new lodge on the banks of the main ditch and think that the rainfall of some days and nights before the 22nd had flooded the new lodge. I guess that the beavers have now built a new chamber in their lodge, higher than the earlier one. This is just supposition. I must go out again and look for the lodge.
Here is a view of the pool from the downstream side of the dam.
The main canal has developed considerably. It is interesting to note the scouring out of channels. First, the bottoms of the canals and overflow channels are of mud. Then, the mud is scoured away and one sees a gravelly bed appearing.
The lodge has been cemented with mud, ready for the winter.