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The Big Muddy Monster or Murphysboro Mud Monster is a Bigfoot or Sasquatch type creature sighted around the Big Muddy River in Southern Illinois, USA.


In documented sighting reports the monster is described as a lumbering hulk, roughly 6 feet tall and wide, like a very big boned man and weigh around 200 lbs. The Big Muddy Monster is covered with fur that is a dirty brownish color, always covered and matted with mud and pieces of plants and leaves. The creatures eyes appear to glow a pinkish-red color in the night.


The first recorded sighting of the Big Muddy Monster took place on June 25, 1973, near Murphysboro, Illinois. According to the Murphysboro Police Department, the Big Muddy Monster remains one of two open cases in the history of the department. Two visitors to Riverside Park in Murphysboro were parked in a car when they heard a loud screaming sound in the wooded area and observed a large creature approximately 7 feet tall. The creature appeared to have light-colored hair matted with mud. The creature appeared to be walking on two legs and was proceeding toward their car. Police searched the area with flashlights and spotted tracks in the mud approximately 3 to 4 inches deep, 10 to 12 inches long, and 3 inches wide. While officers were searching the area they reported hearing another scream coming from the woods.

The next night, two teenagers sitting on a porch reported a tall, white-haired, hairy creature in a field just to the edge of the woods. Using a police dog, officers followed the creature making note of a discernable foul smell and slime on the branches. The dog tracked the creature to an empty barn.

According to the St. Louis Post-Dispatch newspaper, the Mud Monster emerged again as a possible culprit to an attack that allegedly occurred at the Rend Lake campground near Benton, Illinois in August 1989.