Kayaking the LA River in Sherman Oaks (more photos here) | Photo by Zach Behrens/LAist The U.S. Army Corps of Engineers has found the Los Angeles River unnavigable, therefore it is not a river. Critics say it will weaken rules that protect the watershed under the Clean Water Act. "They believe the ripple effect of the decision will make is easier to develop large areas of the Santa Susana, Santa Monica and San Gabriel......