Nutt Hollow Subwatershed Site M-12855 is a low-hazard earth dam located in Monona, Iowa, with a primary purpose of fire protection, stock, or small fish pond. Built in 1958 by the USDA NRCS, this dam has a NID storage capacity of 55 acre-feet and serves to reduce flood risks in the area. Situated on the TR-Maple River, this dam spans a drainage area of 2.53 square miles and covers a surface area of 2 acres.

Despite being rated with a moderate risk assessment score of 3, Nutt Hollow Subwatershed Site M-12855 is deemed to have a low hazard potential. The dam's condition is currently not rated, and there are no inspection frequencies or hazard potential assessments available at this time. The emergency action plan and inundation maps for this site are also not prepared, raising concerns about the readiness for potential emergencies. With its critical location and purpose, it is essential for stakeholders to prioritize the safety and maintenance of this dam to ensure the protection of the surrounding community and water resources.