Lake Mary Ronan State Park is a public recreation area in northwestern Montana, about seven miles northwest of Dayton near Flathead Lake. Covering 120 acres on the east side of the 1,500-acre Lake Mary Ronan, it offers fishing, camping, and boat access in a setting known for kokanee salmon and yellow perch. The lake reaches a depth of 47 feet, and continued stocking helps sustain angling, one of the park’s chief attractions. With 25 campsites and a boat ramp, the park serves visitors drawn to the lake’s recreational opportunities.