Cheboygan sits at the eastern entrance to Michigan's Inland Route, the chain of lakes and rivers that extends from Lake Huron through Mullett Lake, Burt Lake, and ultimately to Crooked Lake near Conway. The water level dynamics here are unique on the Great Lakes because Cheboygan is one of the few places where a controlled dam structure separates a managed inland lake system from open Lake Huron. I am Chris Izworski. I live in Bay City and I have spent enough Augusts on Mullett Lake and enough fall mornings at the Cheboygan State Park beach to take the local picture seriously. This page is the orientation for Cheboygan property owners and Inland Route boaters.
The Cheboygan Dam, also called the Cheboygan State Lock and Dam, sits in downtown Cheboygan on the Cheboygan River about a mile upstream of the river mouth. The dam separates two distinct hydrologic systems. Downstream of the dam, the river and harbor track Lake Huron levels almost exactly. Upstream of the dam, the Cheboygan River and the entire Inland Route operate at a managed elevation that is set by the dam and is typically several feet above downstream Lake Huron stage. The lock at the dam permits small craft passage between the two regimes.
For an Inland Route property owner on Mullett Lake, Burt Lake, or Crooked Lake, the headline is that lake levels at home are largely independent of Lake Huron stage. The dam decouples them. The Mullett Lake elevation in summer is held within a narrow management band that varies only modestly from year to year. For a Cheboygan harbor property owner downstream of the dam, the headline is the opposite. Harbor stage tracks Lake Huron and varies through the full Huron envelope.
The U.S. Coast Guard cutter Mackinaw, the heavy icebreaker that maintains winter navigation on the Great Lakes, is homeported at Cheboygan downstream of the dam. That home port location is itself a useful piece of local water level information. The Mackinaw requires deep, reliable water at its berth across the full range of Great Lakes seasonal and year-to-year variability. The Coast Guard has not had to relocate the cutter during low water cycles, which is a useful indicator of how the harbor performs at the extremes.
East of the river mouth, Cheboygan State Park fronts roughly three miles of northern Lake Huron shoreline. The beach there is mostly sand over glacial till with bedrock outcrops in places. It is more variable than the limestone shore at Alpena but less dramatically beach-loss-prone than the pure sand shores south of Alpena. In high water cycles, the day-use beach contracts and the park lighthouse ruins take wave wash. In low water cycles, the beach expands and the rocky offshore shoals become visible features.
Cheboygan property owners need to pay attention to two different gauges depending on which side of the dam they care about. For the downstream harbor and the Lake Huron shore, the relevant NOAA station is Mackinaw City, 9075080, which captures the same northern Lake Huron and Straits stage that propagates into Cheboygan harbor. For Mullett Lake and the Inland Route, the relevant reference is the Cheboygan Dam management band, which is published by the Michigan DNR and which holds Mullett Lake near 593 feet IGLD 85 through most of the boating season.
Property owners on Mullett and Burt have a much more stable level environment than Lake Huron riparians and need to plan accordingly. The annual draw-down for winter and the spring fill produce predictable seasonal variation of one to two feet but no large multi-year cycles like those on the open lakes. Dock design and seawall planning on the Inland Route can be done against a much narrower envelope than on Lake Huron. The trade is that the Inland Route is a managed system and any change in dam operations would change the equation. The current management practice has been stable for decades.
Cheboygan is sixteen miles southeast of the Straits of Mackinac. The northern Lake Huron stage at Cheboygan is essentially the same stage that the Mackinaw City gauge and the St. Ignace gauge record at the Straits. The Mackinac Bridge clearance, ferry operations to Mackinac Island, and the Round Island Channel are all governed by the same regional water level signal that arrives at Cheboygan harbor. I cover the Straits picture on the Mackinac page and the wider Lake Huron context on the Lake Huron overview.
Questions specific to Cheboygan can reach Chris Izworski through chrisizworski.com.