For the second year in a row, Lake Oroville, one of California's largest reservoirs, is at full capacity."This is great news for ensuring adequate water supply for millions of Californians and environmental needs and we continue to manage both while maintaining flood protection for downstream communities," the California Department of Water Resources said in a post.Standing at roughly 900 feet tall, the reservoir can hold up to 3,537,577 acre-feet of water. Data from DWR shows Oroville is currently holding 3,521,948 acre-feet as of Monday.DWR said while Oroville is at full capacity, visitors at the dam may notice some waves splashing and minor amounts of water going into the emergency spillway. That is normal and expected, the agency stated.Because the dam is at capacity, water managers are expected to release more water to make room for when snow runoff melts. Those increased water flows should also cause water levels for the Feather River to go up as well.Oroville provides water to 27 million Californians, according to DWR.Lake Shasta, the state's largest reservoir, is also doing pretty well at 97% capacity. Lake Folsom is also at 89% capacity.See all reservoir data from the state here.See more coverage of top California stories here | Download our app.