Flood Warning Issued for Cass River at Frankenmuth in Saginaw County

Alert Details

The National Weather Service in Detroit/Pontiac MI has issued a Flood Warning for the Cass River at Frankenmuth. The alert follows overnight thunderstorms that produced significant rainfall across the drainage basin.

Affected Areas

The warning specifically affects the Cass River at Frankenmuth within Saginaw County. The broader drainage basin includes areas near Cass City, Vassar, and Frankenmuth.

What You Should Do

Residents and travelers in the affected area should follow these safety instructions:

• Turn around, don’t drown: Do not attempt to drive through flooded roads. Most flood-related deaths occur in vehicles.
• Avoid flooded areas: Stay away from riverbanks and low-lying areas.
• Stay informed: Monitor local weather updates. The next official statement is expected to be issued by 6:00 PM EDT this evening.

Expected Conditions

Moderate flooding is forecast for the region.

• Rainfall: Thunderstorms overnight produced 1 to 3 inches of rain. Additional rainfall of less than an inch is expected today.
• River Levels: As of 8:45 AM EDT Wednesday, the river stage was 15.1 feet.
• Flood Stage: The flood stage for this location is 17.0 feet.
• Forecast Crest: The river is expected to rise above flood stage late this afternoon, reaching a crest of 20.4 feet by Thursday evening.

Timeline

The Flood Warning is effective starting Wednesday afternoon, March 11, 2026, and will remain in effect until further notice. The river is expected to rise above flood stage late this afternoon.