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Lake Orange Dam Inundation Zone Information

Some residents in Orange County live within the Lake Orange Dam “inundation zone.” The “inundation zone” is the area downstream of the dam that would be flooded in the event of a failure (breach) or uncontrolled release of water. These zones are generally much larger than the area for the normal river or stream flood event.

The dam is owned and maintained by Orange County and is inspected regularly to ensure its safety. The Orange County Planning and Emergency Services departments have updated the Lake Orange Emergency Action Plan, which includes maps and evacuation routes for affected areas, in the highly unlikely event of a breach or failure.

Click one of the maps below to see if your residence falls within the inundation zone. Residents in the inundation zone are urged to familiarize themselves with the evacuation route for their area.

Orange County Emergency Services, in conjunction with the Chapel Hill, Carrboro and OWASA, have partnered on an emergency notification system that provides almost real-time updates during emergency situations, such as extreme weather events, unexpected road closures or other issues that threaten public safety. The OC Alerts system will attempt to notify you via email, text message or phone calls. To sign up for OC Alerts, visit us on the web at

Lake Orange Inundation Zone Maps