The Los Angeles River is small, but mean. People who don't know the truth of it make fun of our river; all they see is a tortured trickle that snakes along a concrete gutter like some junkie's vein. They don't know that we put the river in concrete to save ourselves; they don't know that the river is small because it's sleeping, and that every year and sometimes more it wakes. Before we put the river in that silly trough centered on a concrete plain at the bottom of those concrete walls, it flashed to life with the rain to wash away trees and houses and bridges, and cut its banks to breed new channels almost as if it was looking for people to kill. It found what it looked for too many times. Now, when it wakes, the river climbs those concrete walls so high that wet claws rake the freeways and bridges as it tries to pull down a passing car or someone caught out in the storm. Chain-link fences and barbed wire spine along the top of the walls to keep out people, but the walls keep in the river. The concrete is a prison. The prison works, most of the time.