Hamburg Watershed Site M-1 in Fremont, Iowa, is a critical flood risk reduction structure designed by the USDA NRCS and regulated by the Iowa DNR. Completed in 1961, this earth dam stands at a height of 55 feet and has a storage capacity of 375 acre-feet, serving primarily to protect the local area from potential flooding events along the TR-NISHNABOTNA RIVER. With a surface area of 12.7 acres and a drainage area of 0.88 square miles, this dam plays a vital role in safeguarding the community from water-related hazards.

Despite its high hazard potential, Hamburg Watershed Site M-1 has been assessed as satisfactory in condition, with the last inspection date conducted in June 2019. The dam's emergency action plan status and risk assessment are currently unspecified, raising questions about its preparedness for potential emergencies. With a moderate risk rating, it is crucial for stakeholders and authorities to ensure that proper risk management measures are in place to mitigate any potential threats and protect the surrounding environment and residents. Overall, Hamburg Watershed Site M-1 stands as a key infrastructure for flood control in the region, emphasizing the importance of ongoing monitoring and maintenance to ensure its continued effectiveness in safeguarding the community.