On 14 May 2007, two humpback whales (Megaptera novaeangliae) were observed within the Sacramento River upstream of Rio Vista, CA. NOAA's National Marine Fisheries Services, The Marine Mammal Center, the U.S. Coast Guard, California Department of Fish and Game, and the Governor's Office of Emergency Services responded and coordinated rescue operations. By 27MAY2007, the whales had moved downstream of the Rio Vista Bridge, lingered near the Benicia Bridge on 28MAY and continued on to the Pacific on 29MAY.

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Note: Documents are posted chronologically and early reports likely contain factual errors. These errors may be corrected in a later report.