Flood in Iosco County, Michigan

Widespread areal flooding developed in central and southern Iosco County on the 18th. Many creeks and rivers rose out of their banks, including the Au Gres River system and Silver Creek and its tributaries. Many roads across the county were closed, including Meadow Road in Tawas City. Railroad tracks were also washed out in Tawas City. Townline Road in Tawas Township was washed out by Dead Creek. Flooding along the Lake Huron coastline was worsened by lakeshore flooding thanks to onshore winds.

A very slow moving low pressure system advanced east from the central Plains. Unusually deep moisture was pushed northward into the Great Lakes region, ahead of this low. Multiple rounds of heavy rain fell in parts of northern lower Michigan on the 17th and 18th. This heavy rain targeted east central and northeast lower Michigan in particular. Rainfall amounts of 2 to 4 inches were common by the morning of the 18th in places like Tawas City, Houghton Lake, Omer, and West Branch. Further heavy rain continued, and by the morning of the 19th rainfall amounts were 8.10 in Au Gres, 7.43 in East Tawas, 7.20 in Sterling, and 7.60 near National City. Generalized flooding was widespread and considerable in that part of lower Michigan. In some spots, flooding impacts lasted for days. Runoff from this very heavy rain resulted in the catastrophic failure of Edenville Dam on the Tittabawassee River.