The photo on their site really does not do it justice: https://noma.org/collection/mississippi-meanders/
Walking along it and thinking about how we've tried to keep it in place for the past few hundred years, and the ephemerality of human affairs, is an interesting experience. Especially if you live along its course.
It wasn't just the LA river, but also all the creek beds that fed into it were also channelized or buried under roadways and development:
https://i1.wp.com/www.hiddenhydrology.org/wp-content/uploads...
-- Mark Twain, Life on the Mississippi