Ottilie Dam, located in Marshalltown, Iowa, was completed in 1959 and is owned by a private entity. The dam, designed by USDA NRCS, serves multiple purposes, including fire protection and creating a small fish pond. With a height of 22 feet and a length of 490 feet, the dam has a storage capacity of 60 acre-feet and covers a surface area of 6.2 acres. The dam is regulated by the Iowa Department of Natural Resources and undergoes state inspections and enforcement measures.

The primary dam type at Ottilie Dam is earth, with a soil foundation. The spillway type is uncontrolled, with a low hazard potential and a moderate risk assessment rating. Despite not being rated for condition assessment, the dam has not been modified in recent years. The dam is situated on TR-Burnett Creek and falls under the jurisdiction of the Detroit District of the US Army Corps of Engineers. Although the dam does not have outlet gates or associated structures, it plays a crucial role in water resource management in the area.

Overall, Ottilie Dam is a vital infrastructure for fire protection and stock purposes in Marshalltown, Iowa. With its earth structure and regulated state of operation, the dam provides necessary water storage and management for the surrounding area. As a low hazard potential structure with a moderate risk assessment, Ottilie Dam continues to be a key component of water resource management in the region, ensuring the safety and sustainability of the local environment.