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The Napa County Office of Emergency Services as well as City of Napa both provide useful information on their websites about what you can do to be prepared for a flood. You may wish to review the City of Napa's Citizen's Guide to Flooding and Flood Recovery (PDF). In addition, the Flood Control District can help address certain flood hazards such as trees that have fallen into the stream channel. Report large downed trees and other significant flood hazards located in creeks and drainage channels to the Napa Flood Control District, (707) 259- 8600.
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The District undertakes preventative measures throughout the County to reduce the risk of flood damage to property and loss of life. This includes regular maintenance of stream channels in urban reaches of the County to maintain flow conveyance as well as the monitoring and operation of the Napa River Flood Protection Project during forecast high water events. Flood District staff monitors flood control facilities and the County stream and precipitation gage network during severe weather events to provide information to emergency personnel about flooding potential. In a flood event, City and County emergency services coordinate flood response activities and are the primary sources for flood related information and support.
Use the Napa County GIS public map viewer to search for your address or parcel. Federal Emergency Management Agency (FEMA) flood zones are represented as layers that can be toggled on and off. Remember that flooding also occurs in areas outside designated FEMA flood zones (for example roadway flooding) and conditions can change rapidly. Never attempt to drive through standing water on a road; the National Weather Service advises to "Turn Around, Don’t Drown".
Check the City and County websites for updates to see if there is an active flood advisory. For current precipitation, river and stream level monitoring data from a network of automated gage sites throughout Napa County visit the County's monitoring website.