Mallard Marsh Dam No 1 is a local government-owned earth dam located in Fertile, Iowa, along the TR-WINNEBAGO RIVER. Built in 1967 by WALLACE,HOL,KAS,&SCMITT, this dam serves primarily for recreational purposes, with a storage capacity of 156 acre-feet and a surface area of 26 acres. Despite its low hazard potential and moderate risk assessment, the dam has not been rated for its condition, and no recent inspections or maintenance records are available.

The dam features an uncontrolled spillway type and stands at a height of 8 feet with a length of 650 feet. It is regulated by the Iowa Department of Natural Resources and is subject to state jurisdiction, permitting, inspection, and enforcement. Although the dam has no associated structures and a minimal drainage area of 2.97 square miles, it plays a crucial role in providing recreational opportunities for the local community while also contributing to water resource management in the area.

With its unique location and design, Mallard Marsh Dam No 1 presents an intriguing case study for water resource and climate enthusiasts. Its presence along the TR-WINNEBAGO RIVER adds to the ecological diversity of the region, while its recreational significance highlights the importance of sustainable dam management practices. As efforts continue to monitor and assess the dam's condition, it remains a focal point for both local governance and environmental stewardship in Cerro Gordo County, Iowa.