Shimon Marsh Dam is a state-owned structure located in Fonda, Iowa, along the Little Cedar Creek. Built in 1990 by Ducks Unlimited, this Earth dam stands at a height of 8 feet and spans a length of 1130 feet. With a primary purpose of recreation, the dam provides a storage capacity of 435 acre-feet and covers a surface area of 69 acres.

Despite its low hazard potential, Shimon Marsh Dam is subject to state regulation and inspection by the Iowa Department of Natural Resources. The dam is considered to have a moderate risk level based on a recent assessment, indicating the need for ongoing risk management measures. The spillway type for this dam is listed as uncontrolled, and there are no outlet gates or associated structures.

Water resource and climate enthusiasts will appreciate the unique features of Shimon Marsh Dam, such as its location in Pocahontas County, Iowa, and its relatively small drainage area of 2.15 square miles. While the dam is primarily used for recreational purposes, its design and construction by Ducks Unlimited reflect a commitment to environmental conservation. With its moderate risk level and state regulation, Shimon Marsh Dam serves as a valuable resource for both local communities and wildlife in the surrounding area.