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# Mt. Rainier’s Osceola Mudflow
- URL: https://www.cascadepbs.org/show/nick-rocks/episode/nick-rocks-mt-rainiers-osceola-mudflow/
- Published: 2024-03-30T00:30:32.000Z
- Updated: 2025-12-12T19:29:18.000Z
- Description: The Osceola Mudflow created the Enumclaw Plain by burying a formerly rugged Puget Lowland.
- Author: Cascade PBS Staff
- Tags: Nick on the Rocks, Season 1, Episode 4, #ZZZ_Episode_8a6eaef2-0c96-4478-8148-c75f0c1025a7, #episode, #ZZZ_Show_fb43f9d5-44f4-411a-854a-568025965642, #v1.16

5,600 years ago, a Mt. Rainier eruption sent a wall of mud careening down the White River Valley to Tacoma. The Osceola Mudflow created the Enumclaw Plain by burying a formerly rugged Puget Lowland with hundreds of feet of volcanic mud — a plain now home to over 500,000 people.