The Arroyo Seco, meaning "dry stream" in Spanish, is a 24.9-mile-long seasonal river, canyon, watershed, and cultural area in Los Angeles County, California. The area was explored by Gaspar de Portolà who named the stream Arroyo Seco as this canyon had the least water of any he had seen. During this exploration he met the Chief Hahamog-na o…The Arroyo Seco, meaning "dry stream" in Spanish, is a 24.9-mile-long seasonal river, canyon, watershed, and cultural area in Los Angeles County, California. The area was explored by Gaspar de Portolà who named the stream Arroyo Seco as this canyon had the least water of any he had seen. During this exploration he met the Chief Hahamog-na of the Tongva Indians.
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