Mason Marcks Forsythe 1 is a gravity dam located in Pepin, Wisconsin, along the tributary Little Plum Creek. Constructed in 1978 by the USDA NRCS, this private-owned dam serves a primary purpose of flood risk reduction. With a height of 25 feet and a length of 540 feet, the dam has a storage capacity of 76 acre-feet and a normal storage of 7 acre-feet. Despite its low hazard potential, the dam has a moderate risk assessment rating of 3.

Managed by the WIDNR, Mason Marcks Forsythe 1 is regulated, permitted, inspected, and enforced by the state agency. The dam features an uncontrolled spillway type and has a maximum discharge capacity of 118 cubic feet per second. Although it has not been rated for condition assessment, the dam has a regular inspection frequency of 10 years, with the last inspection conducted in April 2010. With its location in a flood-prone area, the dam plays a crucial role in mitigating flood risks for the surrounding community.

In summary, Mason Marcks Forsythe 1 is an essential infrastructure for flood risk reduction in Pepin, Wisconsin. Managed by the WIDNR and designed by the USDA NRCS, this gravity dam provides critical protection along the tributary Little Plum Creek. With its moderate risk assessment rating and regular inspection schedule, the dam ensures the safety and security of the area by effectively managing water resources and climate challenges.