Day 2 of the Los Angeles River Expedition 2008. Organized by publisher George Wolfe, boaters embark on a 52-mile exploration of the full river, from its source (Canoga Park) to its estuary (Long Beach). Deemed not to be a traditional navigable water” by the Army Corps of Engineers — and therefore not worthy of clean water standards, the Expedition’s purpose is to prove it is navigable. Glendale Narrows, Los Angeles County, California, USA. .