The public map is called Perimeter and is maintained by Merced County First responders.
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Officials with the Merced County Emergency Operations Center say the map will show current road closures due to flooding as well as shelters for potential evacuees.
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The map is free, and no sign-up is required.
Officials say the website will only be updated during emergency events, such as flooding, earthquakes, etc.
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The Merced County Emergency Operations Center will notify the public when an event triggers the activation of the Perimeter application.