By the mid-2010s, California agencies had placed more than 200,000 tons of gravel below Keswick Dam, restoring egg-laying habitat for endangered salmon

California has transported over 200,000 tons of gravel to restore critical spawning habitat for the endangered winter-run Chinook salmon. This effort aims to counteract the ecological damage caused by Shasta and Keswick Dams, which block natural sediment flow.

Raccontata daeconomictimes.indiatimes.com