The average annual flow of the Napa River is about through the populated center of the City of Napa. During a 100-year flood, the flow increases to an estimated to . The Napa River-Napa Creek Flood Protection Project employs a combination of traditional and innovative approaches to reduce the flooding threat. In the downstream project area, dikes have been removed and tidal marshalands have been restored; bridges have been replaced to remove obstacles to water flow; riverbank terracing has been done to provide more room for large volumes of water; a dry bypass channel will be excavated to create a shortcut for fast moving floodwaters to pass through the Oxbow area; new dikes, levees and floodwalls will be built; bank stabilization will be used in specific areas; and detention basins and pump stations will accommodate runoff behind the floodwalls.