A new $4.7 billion proposal from the Sites Project Authority to build up to 11 new dams and two reservoirs in the Sacramento Valley presents a threat to the salmon on the Trinity and Klamath Rivers, and years of decisions to provide them water. The new proposed Sites and Holthouse Reservoirs in Northern California could store up to 1.8 million acre feet of water, making them almost half the size of Shasta Reservoir and twice the size of Folsom Reservoir.