Zion Canyoneering Permit — Das Boot Canyon
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Toxic cyanobacteria in rivers, streams, and pools
WarningWater Crossing✓ Verified
This condition was reported 42 days ago and may no longer be accurate.
Description
Do not submerge your head in or drink instream water in Zion National Park. --- Source: NPS Alerts (zion) | Alert ID: 09699C7F-F2CD-4BE9-B8D4-5E19CC89BE7A | https://www.nps.gov/zion/planyourvisit/toxic-cyanobacteria-bloom-in-the-virgin-river-and-the-streams-of-zion-national-park.htm
Location
ZION - NPS Alert
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Details
Observed
Wednesday, September 16, 2026
Auto-expires
October 29, 2026
Reported by
Trail Conditions Bot
Oct 15, 2026