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In about 1878 S. M. Hewings built a “temporary” dam near the site of the present dam. This was made of stones and logs. The top layers of the dam would be removed in the Spring to allow for the flow of ice. This dam allowed for deeper water for boating.
Stone dam or Lower dam was built in 1887 by J.S. Mudge the new owner of the Seven Islands Resort. This dam replaced the temporary one but was also use to create a deep body of water for pleasure boating and swimming. This dam has been modified at least twice. Fist gates were installed at the northern end to allow the dam to be opened to lower the water level. In the 1970s fish ladders were installed on the southern end to allow for the migration of fish along the Grand River.