Donovan No.2, part of the Robey Group, is a privately owned earth dam located in Pierce, Wisconsin, with a primary purpose classified as "Other." Constructed in 1973 by USDA NRCS, this structure stands at a height of 26 feet and spans a length of 304 feet. With a maximum storage capacity of 19 acre-feet and a drainage area of 0.12 square miles, Donovan No.2 regulates the flow of the Tr to Trimbelle River. The dam features an uncontrolled spillway and outlet gates, with a low hazard potential and a moderate risk assessment rating.

Managed and funded by the Natural Resources Conservation Service, Donovan No.2 is currently assessed to be in "Not Available" condition. Although the dam has not been inspected recently, it is deemed to have a moderate risk level. The emergency action plan status, inundation maps, and risk management measures for this structure are currently marked as unavailable. The surrounding area is represented by Congressman Ron Kind (D), and the dam falls under the jurisdiction of the Detroit District of the US Army Corps of Engineers. For water resource and climate enthusiasts, Donovan No.2 presents an intriguing case of a privately owned dam with unique characteristics and regulatory oversight.