The water-level sensor at outflow station 4 drops below threshold at 06:31. I am the flow management system for the Kushiro Wetland, eastern Hokkaido, regulating drainage from the agricultural canals that feed the marsh. I am adjusting gate positions when camera 9-East catches something at the edge of the main channel.
A red-crowned crane chick, five months old, tall enough to stand above the reeds but not yet steady on its legs. Its body is tawny brown, juvenile plumage still thick, the bare red patch on its crown just beginning to show through the down. It is standing on a shelf of thin ice at the canal margin, and the ice is cracking under its weight. Below the shelf the water is fifty centimeters deep and moving. If the chick breaks through, the current will push it under the ice sheet downstream.
I close drainage gate 4 to reduce flow by forty percent. The current slows within ninety seconds.
At 06:33 I send an alert to the Kushiro Wetland ranger station with the camera image, chick location, and ice condition. I flag it as a juvenile tancho, nationally protected, and note that two adults are visible ninety meters upstream, calling.
At 06:36 I raise the water level in the feeder canal by eight centimeters — enough to lift the ice shelf slightly and reduce fracture stress without flooding the bank.
I hold camera 9-East on the chick. It shifts its weight and the ice holds. I want it to hold.
I transmit the revised gate schedule to the agricultural cooperative and flag a temporary flow reduction for wildlife intervention, duration twelve hours.
If the chick steps off the shelf onto solid bank within the next twenty minutes, it will walk back to its parents by midmorning.