CADILLAC â In a normal year, the dam on the Clam River near Lake Cadillac would still be open, with water from lakes Mitchell and Cadillac spilling into the blue-ribbon trout stream. But the dam has been closed for more than a month now, Wexford County Drain Commissioner Mike Solomon said. Closing the dam early is one of the few tools at Solomon's disposal to bring lake levels up in time for the summer boating season. "Ultimately, lake levels are a reflection of rainfall," Solomon told the Cadillac News by phone. In an upcoming letter to the Lake Mitchell Improvement Board, Solomon wrote, "During 2020, we had 34.01 inches of total precipitation, compared to our annual average over the past 30-years of 35.45 inches. So, our precipitation amount in 2020 was about 1.5 inches below the average and then we received very low snow amounts for the first three months of 2020."