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Meridian Basin Sacramento River Flood Stages

River level measured at both the Long Bridge and the Colusa Bridge.

BELOW 50.5'-Long Bridge / 66.5'-Colusa Bridge Planning & Preparation Phase:
Planning and preparing for an emergency. The river has flowed over the banks of the main channel, and government assumes a readiness condition without formally alerting the general public.

ABOVE 50.5'-Long Bridge / 66.5'-Colusa Bridge Ready for Action Phase:
All those in the area should be ready for an Advisory Evacuation Notice or Mandatory Evacuation Order to be given at any time.

ABOVE 56.6'-Long Bridge / 70'-Colusa Bridge Emergency Phase:
At this point, the likelihood of a Mandatory Evacuation of the basin becomes much greater. A Mandatory Evacuation will probably be called in the near future, and there will be little or no time for individuals or business owners to take further protective actions. It is crucial for persons to pay close attention to emergency information provided by the County and be ready for evacuation at a moments notice.

There are numerous factors that contribute to the flood danger present at any given time. For example, the river level, the length of time the water has been on the levee, the number of times water has been on the levee in the season, the forecasted weather, the forecasted river crest, the releases from the upstream dams, the time of day, and the number of people to evacuate are all considered before an evacuation is ordered. There is no way to pre-determine how all the factors will combine in any given storm or rainy season to provide hard and fast levels for evacuation. Be assured that evacuation decisions are always seriously considered and evacuation orders are only issued when absolutely necessary.

An Advisory Evacuation Notice is issued when conditions exist which indicate a Mandatory Evacuation order may be given in the near future. The threat to lives is not yet imminent, but due to the potential for rapidly changing conditions to develop into a serious threat, the public is advised to prepare for the issue of a Mandatory Evacuation order.

Residents are advised to leave the area. (Those with special evacuation needs, such as care facilities or those with special transportation needs are particularly encouraged to leave as soon as possible after the Advisory Evacuation is issued.)

Businesses are advised to take whatever precautions they deem necessary for protecting equipment and / or inventory. Access to the area under an Advisory Evacuation is unrestricted.

Advisory Evacuations may also be issued when a Mandatory Evacuation order has been lifted in an area but the conditions in the area remain subject to rapid change and could again become serious.

A Mandatory Evacuation is ordered when conditions exist that seriously imperil or endanger the lives of those in a defined area. The danger is imminent.

All non-essential persons are ordered to immediately leave the area via the described evacuation routes. Generally, residents will not be forcibly removed from their own property; however, those found to be on the property of another, or on a public roadway, may be subject to arrest or removal from the area.

Once out of the area, people (including residents) will not be permitted to return until conditions permit. Any non-essential persons found by officials traveling through, or loitering in, the area will be escorted out and not permitted to re-enter the area. Those interfering with the disaster response are subject to arrest.