Aerial view of construction of the step pool weirs that will allow fish to pass into the upper reaches of the Potagannissing River. - Photo by Tim Cwilinski, Michigan DNR

Biologist Wells and Michigan DNR Supervisor, Chris Freiburger, survey construction of the step pool structures. - Photo by Tim Cwilinski Michigan DNR

On September 22, the Potagannissing Dam project was completed.  A small dam existed on the Potagannissing River, within 3 miles of the Harbor Island NWR in Potagannissing Bay. 

This structure traditionally has blocked upstream passage of many fish species, particularly native northern pike, walleye, and white sucker. Many marsh-like lakes exist upstream of this dam and have historically provided ideal spawning habitat for northern pike before passage was blocked. 

The Michigan DNR installed an old, denial style fish ladder was located at the dam in the 1970's, but it has never proven successful at passing fish both upstream and downstream.

The fish ladder was removed as part of the project and the headwall of the dam completely removed. A series of four rock weirs were placed below the removed headwall to create a rock fish-ramp thereby reducing slope and creating appropriate resting pools for upstream migration of important native species, particularly northern pike which have been declining in this region.

Partners for this project included the Michigan DNR who completed the design, survey, and permit work for this project, and the Drummond Island Sportsman's Club.  They were an integral partner who brought this project to our attention and contributed monetary funds towards its completion. 

This project restored one mile of riverine habitat and provided access to 434 acres of wetland habitat for migrating fish within the Potagannissing Bay.