Webster is a privately owned dam located in Madison, Idaho, with a primary purpose of irrigation. Constructed in 1976, this earth dam stands at a height of 22.3 feet and has a hydraulic height of 18.1 feet. It impounds Lyons Creek and the Snake River, providing a storage capacity of 55 acre-feet with a normal storage level of 55 acres. With a surface area of 6 acres and a drainage area of 9.2 square miles, Webster plays a crucial role in supporting agricultural activities in the region.

Despite being classified as having a low hazard potential, Webster is subject to state regulation, inspection, and enforcement by the Idaho Department of Water Resources. The dam's condition was assessed as fair during its last inspection in April 2018, with an inspection frequency of every 5 years. The spillway, with a width of 13 feet, is of the uncontrolled type. The risk assessment for Webster indicates a moderate level of risk (3), emphasizing the importance of ongoing monitoring and maintenance to ensure the safety and reliability of this vital water resource infrastructure.

Overall, Webster serves as a key component of the water management system in the area, contributing to the irrigation needs of the local agricultural community. With its modest size and low hazard potential, the dam presents a manageable level of risk that is regularly assessed and monitored. As climate change continues to impact water resources, maintaining the integrity of structures like Webster will be essential in ensuring sustainable water management practices for the future.