The Central Hillside neighborhood of Duluth, MN received close to three inches of rain fell in just a two hour period between 3:00 am to 4:30 am on August 20th, 1972. A mass of debris including furniture, bricks, rocks, mud, and telephone poles were washed down the Duluth hill. The severity of the damage was attributed to the steep terrain of the Duluth area; a rise of 800 ft within less than a mile.
An additional factor in this flood event was the 6.04 inches of rain that fell during the previous two weeks of August; with 3.85 inches falling on the 15th and 16th. These rains saturated and weakened many streets and alleys and left many sewers clogged.
President Richard Nixon declared the area a Federal Disaster. Damages total $18 million.