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Emergency Management Sirens - Cook Nuclear Tests

Every year on the first Saturday of April, the Cook Nuclear Plant performs an extended sounding of its early warning siren system as a part of its required annual testing. The regularly-scheduled first Saturday of the month siren test typically lasts for about one minute, but each April, the sirens sound for a full THREE minutes. Siren and other basic emergency information can also be found in the emergency information calendars that are produced by the Cook Plant and mailed annually to residents and businesses in Berrien County.

The electronic sirens are omni-directional, meaning they can be heard in all directions at once, and are an important part of the county's alert and notification system within the 10-mile radius Emergency Planning Zone of the plant in Bridgman. This extended test is an annual event in April, but residents should understand that typical tests do last less than one minute and the regular monthly tests happen on the first Saturday of each month at approximately 1:00 p.m. In the event of a real emergency, the sirens would sound for three to five minutes and residents should tune to local radio or television stations for more information.

If you have questions or would like additional emergency information calendars, visit, call 800-548-2555 or email You may also email Gayle Bassett at the Office of Emergency Management for additional calendars or call 269-983-7111 x4915.

919 Port Street
St. Joseph, MI 49085
(269) 983-7141
BCSD Niles Substation
1205 N. Front Street
Niles, MI 49120
(269) 684-5274
BCSD Watervliet Twp Substation
4959 M 140
Watervliet, MI 49098
(269) 463-5495
Deputies may be on patrol
Four Winds Substation
19279 Kinst Road
New Buffalo, MI 49117
(269) 756-9571 ext. 7603
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