On the morning of 1 May 2016, while monitoring Western Snowy Plover (Charadrius nivosus nivosus) breeding activity on the south spit of Humboldt Bay (40.741° N, 124.245° W), I found a storm-petrel carcass on the high waveslope. At Humboldt State University, Tamar Danufsky and I later identifid it as a Wedge-rumped StormPetrel (Oceanodroma tethys), a neotropical species typically found offshore from Baja California Sur to northern Chile. Housed at Humboldt State University (HSU 9649), this specimen, the second for California, represents the 13th record for California accepted by the California Bird Records Committee (Tietz and McCaskie 2017) and the northernmost record of the species.