The Big Creek Barrier Dam, also known as the Big Creek Ponding Area, is a gravity dam located in Polk City, Iowa. Completed in 1974 by the US Army Corps of Engineers, the dam stands at a height of 84 feet and has a structural height of 83 feet. With a capacity to store 4,200 acre-feet of water, the dam primarily serves the purpose of flood risk reduction for the nearby Big Creek and Saylorville Lake.

Managed by the US Army Corps of Engineers, the Big Creek Barrier Dam has a high hazard potential and is subject to regular inspections and risk assessments. The dam is equipped with flap and slide gates for controlled water release. In the case of severe weather events or excess water inflow, the dam may release water to manage water levels and relieve pressure to maintain its structural integrity. The USACE continuously monitors the dam's condition, prioritizes risk-reducing activities, and collaborates with local emergency managers to develop emergency action plans and evacuation strategies.

Overall, the Big Creek Barrier Dam plays a crucial role in mitigating flood risks in the region. Through proactive risk management measures, regular maintenance, and community engagement, the US Army Corps of Engineers ensures the safety and functionality of the dam to protect the surrounding area from potential flooding incidents.