Yes, there are remnants of old levelers, sometimes multiples, in a number of the places I trap.

I have one place that made the mistake of removing a good ole’ straight pipe and paying thousands to install a flow device. Beaver defeated the flow device and now they pay me to clean that absolute nightmare out AND trap the beavers. 100% wasted money, and now it costs them more because maintenance is so difficult, and they no longer have a straight pipe for an outlet. That leveler is the only outlet, and it is easy for the beavers to plug and difficult to clean out. At least a straight pipe can be guarded by a screen and much more easily cleaned when the beavers move in. I think I have them convinced to put a straight pipe back in because I told them how much less I would charge to clean that out compared to the leveler.