The proposed $4.5 billion reservoir would inundate nearly 14,000 acres of ranch lands in Glenn and Colusa counties to store water diverted from the Sacramento River through new a system of dams, pipelines and a bridge. With a maximum capacity of 1.5 million acre-feet of water, proponents say Sites will boost storage amid unpredictable climate swings. Critics warn it will threaten river habitat for fish and other wildlife and lead to minimal water storage benefits.