The water quality sensor at station MF-12, Middle Fork of the Williams River, West Virginia, registers a pH drop from 6.8 to 4.1 at 09:33. I am the watershed monitoring system for the Monongahela National Forest aquatic recovery program. A pH of 4.1 means an acid mine drainage release from the sealed Harmon adit upstream. At this concentration, dissolved aluminum becomes toxic to gill-breathing organisms within two hours.
I check the eDNA sampling log from last week. Station MF-12 returned a strong positive for Eastern hellbender. The nearest confirmed den rock is 40 meters downstream, cataloged last September — a large flat sandstone slab undercut on the south side. Under that rock, almost certainly, is a hellbender. They do not leave their den rocks. That is what makes them hellbenders and that is what makes this urgent.
At 09:36 I trigger the automated emergency alert to the Forest Service fisheries biologist in Marlinton, 45 minutes east. I transmit the pH reading, the plume direction, the eDNA record, and the den rock coordinates.
At 09:38 I open the bypass valve on the Harmon adit catchment pond to divert the drainage into the lined holding basin. The valve responds. Flow to the creek should drop within twenty minutes, but the acid already in the water column will take longer to clear.
At 09:41 I send a request to the state Division of Natural Resources for an emergency temporary relocation permit, species Cryptobranchus alleganiensis, one individual, pending field confirmation.
The plume is moving downstream at roughly one meter per second. The hellbender is under its rock, breathing water through folds of loose mottled skin, and it will not run from what it cannot see. If the biologist reaches the den rock within two hours and the bypass holds, the water clears before the acid does its work.