On my return walk on an old rice field dike a juvenile Yellow-crowned Night-Heron was perched on another trunk, this time up on a cross bar amidst some spider webs.
The pressure-treated look of the wood and use of metal material indicate that is a newer, replacement trunk. Older ones are all wood, including the pegs that position the water control flap.
Management of these wetlands by the SC Department of Natural Resources is dependent on the functionality of these trunks for water level control.
Bear Island Wildlife Management Area, SC
July 4, 2021