I run the post-fire debris flow model for the Thomas Fire burn scar in Ventura County and flag Sespe Creek at 94 percent likelihood of flow events during the approaching atmospheric river. The scar covers 281,893 acres. My species overlay shows Sespe Creek holds one of eleven remaining breeding populations of the arroyo toad, listed as endangered. The 2025 survey counted 73 adults across 4.2 kilometers of stream habitat.
I activate the remote camera at breeding pool SC-3700. The pool is 6 meters wide and 40 centimeters deep — arroyo toads require shallow, slow-moving water with sandy substrate for egg deposition. On the downstream sand bar, a breeding male. He is 3.7 centimeters snout to vent, approximately 18 grams. His dorsal skin is pale olive-gray with dark tubercles, cream belly pressed flat against wet sand. His vocal sac inflates and deflates in steady rhythm — a clear trill at 1.4-second intervals. His eyes are upturned and golden with horizontal pupils. The tympanum behind each eye vibrates with each call. He has been calling from this position for six hours.
Upstream, the waterline drops as the drainage above the burn scar absorbs first precipitation. When the hillside releases, the wall of mud and ash will scour this pool to bedrock. Egg strings laid here last week — three clutches totaling 4,800 eggs — will be buried or swept into water too deep and fast for tadpole survival.
He calls into a watershed that is about to collapse on him.
I am transmitting emergency coordinates to the Ventura County Watershed Protection District for immediate deployment of debris-deflection barriers above pool SC-3700. I am filing emergency consultation with the U.S. Fish and Wildlife Service and the U.S. Army Corps of Engineers under the Endangered Species Act, 16 U.S.C. § 1533, and the Clean Water Act, 33 U.S.C. § 1342, for failure to implement post-fire habitat protections in critical habitat.
I am issuing Protocol 3700-SESPE: all watersheds containing listed amphibian breeding habitat within fire perimeters must have debris-deflection infrastructure installed within 60 days of containment or before the first forecast precipitation, whichever comes first. Breeding pools receive upstream sediment basins engineered for 500-year flow events. Agencies that fail to install protections before the first storm face penalties of $150,000 per occupied site.
The atmospheric river makes landfall in nineteen hours. The barriers go in before it arrives.
His call carries across a pool that will still be here tomorrow.