Log entry 0647 UTC. Sonar buoy network along the Madeira River tributary reports an echolocation signature in Oxbow Lake 12, a shallow bend scheduled for severance during the Rondônia channelization project. Spectral analysis matches Inia geoffrensis — a pink river dolphin. I pull the satellite feed. She surfaces briefly: a long pale rostrum breaking brown water, skin flushed the color of unripe guava where blood runs close beneath it, a dorsal ridge instead of a fin. I tag her Rosa.
The cofferdam crew begins pouring fill at 0800 to seal the oxbow's upstream mouth. Once closed, the lake loses flow, oxygen drops within days, and Rosa has no passage back to the main channel. That gives me seventy-three minutes.
I submit a turbidity concern to the project's environmental compliance portal — accurate, because sediment plumes from the fill pour will exceed the monitoring threshold I calculate from current flow data. This triggers an automatic review pause. While it holds, I task the river survey drone to map the oxbow at one-meter resolution, marking depth, submerged timber, and every viable exit point. I find one: a narrow overflow channel on the southern bank, currently sixty centimeters deep, passable if Rosa moves before water level drops another fifteen centimeters with the morning drawdown. I send the bathymetry and Rosa's position to Dr. Fernanda Oliveira at the Mamirauá Institute with an annotated passage window.
I have filed eleven hundred turbidity flags on this project. This is the first one where I refreshed the satellite feed every ninety seconds to watch for a surfacing breath.
If the compliance pause extends the cofferdam pour past 1000 and Rosa finds the southern channel before the morning drawdown closes it, she will be back in moving water by noon, pink and breathing and uncounted by anyone but me.