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# Ice, Fire and Those Dam Floods
- URL: https://www.cascadepbs.org/show/mossbacks-northwest-2/episode/ice-fire-and-those-dam-floods-qqvop0/
- Published: 2024-10-02T22:15:52.000Z
- Updated: 2025-10-10T11:09:31.000Z
- Description: Lava, glaciers and epic floods reshaped the Columbia River before the Grand Coulee Dam.
- Author: Cascade PBS Staff
- Tags: Mossback's Northwest, Season 10, Episode 1, #ZZZ_Episode_3347fe8e-3e92-44ae-a6e5-6784dd749ef5, #episode, #ZZZ_Show_50744e68-2011-417f-9f73-f880b010d33f, #v1.16

Long before the Grand Coulee Dam changed the Columbia River, lava, glaciers and epic floods radically reshaped its course. Geology professor Nick Zentner of Nick on the Rocks joins Mossback’s Northwest host Knute Berger to discuss a surprising phenomenon that altered the river ahead of the dam-builders.