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Cathlacumup Indians. A Chinookan tribe formerly living on the west bank of the lower mouth of Willamette River, near the Columbia, claiming as their territory the bank of the latter stream from this point to Deer Island, Oreg. Lewis and Clark estimated their number at 450 in 1806. They are mentioned in 1850 by Lane as being associated with the Namoit and Katlaminimim.