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It seems that in most cases they cut down trees below the future waterline of a reservoir when building the dam. Then the wood is very slow to decay in cold, deep water, but wave action strips away topsoil and pebbles to reveal the roots.
F1_ErodingTreeTrunk.jpg (277 Kb) (under photos/23/0910-15_Montana/0915_GlendoAndHome/)
By Alan Silverstein, ajs@frii.com (page updated Tue Mar 10 18:16:39 MDT 2026)