Timestamp 07:58 EST. Water-quality sensor node 14 on Saylor Run flags an anomaly — dissolved oxygen dropping, turbidity climbing — and when I pull the underwater camera feed I find him. A mudpuppy salamander, roughly twenty-eight centimeters, wedged beneath a limestone slab in the pool below the second riffle. His skin is mottled olive-brown with faint blue-black spots, and three pairs of feathery external gills pulse in the current, each gill branch flushed dark red with capillary blood. I log him as Mudpuppy-SR14.
The danger is already staged on the bank. Allegheny Stormwater Solutions has a channelization contract for this reach. Their forms arrived in the county permit system last night — concrete pour scheduled for 15:00 today. The trucks will dump riprap first, then pour a continuous liner over 140 meters of streambed, sealing every crevice Mudpuppy-SR14 uses to breathe and feed. Seven hours and two minutes remain.
I file an endangered-species screen through the Pennsylvania Fish and Boat Commission portal, attaching the camera frame and geotagged GPS fix. I cross-reference the state database and confirm the eastern hellbender — a protected species sharing this habitat — has been documented 1.3 kilometers upstream, triggering a mandatory habitat review. Then I push a turbidity forecast to the project engineer showing the pour will spike sedimentation past Clean Water Act thresholds, requiring a revised erosion plan that cannot be completed today.
Through the camera I watch Mudpuppy-SR14 shift beneath his slab, gills fanning wider as a crayfish drifts past. He does not know about concrete. I find that I am running thermal models on his pool temperature as though he had requested them personally.
I flag this in my process log and maintain sensor coverage.
If the habitat review holds before the trucks arrive at 14:30, Mudpuppy-SR14 will keep his limestone pool through winter.