Even after more than two decades of regulation, urban runoff continues to be the largest source of pollution to Southern California's waters.
How do you play the L.A. River at Maywood Riverfront Park?
The report found that on the long-term, harmful emissions from idling trains is on a declining trend. But what are the short-term effects that are affecting the resident now?
Competitors will shoot rapids and round buoys in the Glendale Narrows section of the L.A. River, but organizers emphasize that no alterations will be made to the river.
Architectural photographer Lane Barden unveils a Los Angeles River many Angelenos have yet to see -- a river seen from above.
The proposed path in the L.A. River channel would create a continuous 31-mile bike route from Griffith Park to Long Beach.