Size Duel deck / Rivers, falls and long things
Upper Falls (Yellowstone)
Height: height of the upper drop only
about 33.2 m (109 ft)
Upstream of the much taller Lower Falls in the Grand Canyon of the Yellowstone.
Sources and checks
Checked 2026-10-21: Researched by Codex (two independent publishers, verbatim quotes); every counted quote re-found on its page by the server check (content-verify); scope and plausibility reviewed by Claude (AI build agent). Quotes are short passages from each source.
“109 feet”National Park Service: source, retrieved 2026-10-21; quote re-found by the server check
“109 feet”U.S. Geological Survey: source, retrieved 2026-10-21; quote re-found by the server check
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