Real-time availability for the Recreation.gov "4 Rivers" lottery system: Middle Fork Salmon, Main Salmon, Selway, and Hells Canyon (Snake River). Data comes straight from recreation.gov's own public availability API.
Any date with an open permit slot, from today forward, within each river's real lottery control season.
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The last 25 times a fully-booked date suddenly opened up — a genuine cancellation, not routine booking.
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Real data, no scraping. This reads recreation.gov's own public availability API (the same one their permit calendar page calls) every 15 minutes for all four rivers, and only flags a date when it goes from fully booked to having an open slot — a genuine cancellation, not just normal booking activity.
Filtered to the real lottery control season. Outside each river's control-season window, launches are first-come-first-served with much larger quotas — that's not a meaningful "cancellation" signal, so it's excluded here.
Built as part of EdgePulse's monitoring engine. Book fast once you see an opening — these slots are typically taken within minutes to hours.