Little Spider Lake, located in Iron River, Wisconsin, is a picturesque reservoir created by the Mullenhoff Dam in 1929. This private dam stands at a height of 7 feet and has a total length of 400 feet, with a normal storage capacity of 200 acre-feet. The dam serves as the outlet for Mullenhoff Lake, contributing to a surface area of 69 acres and a drainage area of 0.8 square miles.

Despite its age, the Little Spider Lake dam has a low hazard potential and is currently rated as "Not Rated" in terms of condition assessment. While the dam is regulated by the Wisconsin Department of Natural Resources and subject to inspection and enforcement measures, it has not been evaluated for its emergency action plan or risk management measures. With a maximum discharge capacity of 20 cubic feet per second and an uncontrolled spillway type, the reservoir presents a moderate risk level but remains a captivating site for water resource and climate enthusiasts in Bayfield County.

As a focal point for outdoor enthusiasts and environmentalists, Little Spider Lake offers a unique blend of natural beauty and historical significance. From its scenic surroundings to its engineering marvels, this reservoir continues to serve as a vital water resource in Wisconsin, inviting visitors to explore its tranquil waters and appreciate the delicate balance between human intervention and environmental preservation.