Not photographic in any way, but John McPhee wrote a fascinating 2-part piece about this area and flood control for the New Yorker called L.A. Versus The Mountains:
https://www.newyorker.com/magazine/the-control-of-nature
Interesting, thanks for sharing.
I can imagine that all of these communities here at the foothills of the San Bernardino Mountain range (Arcadia, Monrovia, San Dimas, etc.) were affected by water runoff ... hence the construction of these reservoirs.
There are whole ecosystems that depend on these reservoirs now, over the years, and they provide a source for much of my wildlife photography. Below is a reduced image of the original up top, with the designation of where the water used to extend to, maybe six or seven years ago. The water depicted in the other images is actually higher than it's been a long time—there was almost nothing left there for a while.
It's raining right now, as I write this, so hopefully there'll be an even greater enhancement to the water level.
It's also a great time to go out and hunt for salamanders, frogs, and toads
