Ridler, also known as Woodley, is a recreational earth dam located in Polk, Wisconsin, along the Apple River. Completed in 1910, this dam stands at a height of 18 feet and has a storage capacity of 140 acre-feet, with a normal storage level of 80 acre-feet. The dam spans 250 feet in length and serves as a popular spot for outdoor activities in the area.

Managed by the local government, Ridler has been regulated by the Wisconsin Department of Natural Resources (WIDNR) for state permitting, inspection, and enforcement. The dam has a low hazard potential and a very high risk assessment rating, indicating the need for risk management measures to ensure its safety and stability. Although not currently rated for condition assessment, Ridler is still frequented by visitors who enjoy its scenic surroundings and recreational offerings.

Despite being over a century old, Ridler continues to be a significant part of the local landscape, providing both recreational opportunities and water resource benefits. With its controlled spillway and historical significance, this earth dam serves as a reminder of the importance of proper management and maintenance of water infrastructure in the face of changing climate conditions.