Michigan Gov. Rick Snyder has surveyed flooded streets and neighborhoods across the Detroit area to assess damage caused by what he calls a "record event of rain."
Snyder says the Emergency Operations Center will help make assessments on whether federal assistance will be needed.
He toured affected areas by helicopter Tuesday after cutting short a trip to the Upper Peninsula.
More than 6 inches of rain fell within a few hours Monday across parts of southeastern Michigan, leaving streets and freeways impassable.
Snyder says that "there are still areas literally flooded with several feet of water."
The operations center was activated to coordinate response with local officials.