The Shasta dam and reservoir supplies more than half the total water delivered by the federal Central Valley project; most of it goes to California farmland.
The draft proposal issued earlier this year looks at three potential plans: raising the dam by about 6, 12 or 18 feet respectively. The biggest raise would increase storage capacity by 14 percent or an increase of more than 200 billion gallons.
Louis Moore with the Bureau of Reclamation says this would mean more water available during droughts, and it could also help fish:
MOORE: "Salmon need cold water supply. Having additional water storage or water availability, you're able to release cold water so when the fish are migrating up you have the potential to provide better cold water resource for them at that time."
So far Moore says they've heard some concerns from people who live upstream whose properties could be flooded in some of the proposed scenarios.
Potentially raising the Shasta dam is one of five projects under consideration to increase water storage in California.