California Department of Water Resources officials reached their goal of getting water levels in Lake Oroville 50 feet below the dam crest Monday.The reservoir reached 50 feet below capacity as of 6 a.m. Monday. The 850-foot mark is important because it gives ground crews more flexibility for water flowing into the lake during this week’s storms, DWR officials said. “It allows us to lower our outflows from the dam, so we can start working on the diversion pool,” said Chris Orrock, a DWR spokesman.