Johnston, also known as Johnston Surprise, is a federal-owned fish and wildlife pond located in Bayfield, Wisconsin. Completed in 1960, the dam stands at a height of 10 feet and has a hydraulic height of 5 feet. With a storage capacity of 120 acre-feet, Johnston serves as a vital resource for supporting the local ecosystem and wildlife in the area.

Despite its low hazard potential and fair condition assessment, Johnston poses a moderate risk level (3) according to the data. The dam has a controlled spillway type and covers a surface area of 15 acres, with a drainage area of 1.2 square miles. The last inspection of Johnston took place on May 30, 2019, with an inspection frequency of every 10 years.

While Johnston has not undergone any significant modifications in recent years, it remains an important structure for the conservation of fish and wildlife in the region. As climate change continues to impact water resources, Johnston serves as a reminder of the crucial role that well-maintained dams and ponds play in maintaining biodiversity and ecological balance in our changing environment.