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USGS/Cascades Volcano Observatory, Vancouver, Washington

Cascades Volcano Observatory
"Real-Time" Hydrologic Monitoring


[Provisional data, subject to revision -- Please Read]
Spirit Lake at Tunnel - 14240304

Castle Lake - 14240446

South Fork Toutle at Toutle - 14241500

Toutle River at Tower Road - 14242580

Cowlitz River at Castle Rock - 14243000

Lewis River above Muddy River near Cougar - 14216000

Muddy River below Clear Creek - 14216500

Canyon Creek near Amboy - 14219000

Speelyai Creek near Cougar - 14219800

Lewis River at Ariel - 14220500

East Fork Lewis River near Heissen - 14222500

Naselle River near Naselle - 12010000

Hoala Mudflow Detection

Loowit Falls Mudflow Detection

Maratta Creek Mudflow Detection

Current and Historical Hydrologic Stations
  • Listing of Current and Historical Hydrologic Data Collection Sites in the Mount St. Helens Vicinity, including the Lewis River Basin, Kalama River Basin, Cowlitz River Basin, and Miscellaneous areas around Mount St. Helens


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06/25/08, Lyn Topinka