Whitefish Bay sits at the eastern end of Lake Superior between Whitefish Point on the south and Gros Cap on the north, and Chris Izworski treats it as a distinct sub-region for two reasons. First, it is the funnel through which every vessel transiting the Soo Locks must pass, so its water level matters for commercial navigation in a way that no other Lake Superior shoreline does. Second, the bay's geography and exposure produce a markedly different shoreline regime than the open Lake Superior coast to the west: more protected on the south and east shores, more sediment-rich, and historically the deadliest stretch of coast on the Great Lakes for shipwrecks.
Sub-region: Whitefish Bay, eastern Lake Superior, Michigan and Ontario.
Major communities: Paradise, Whitefish Point, Brimley, Bay Mills, Sault Ste. Marie (Michigan and Ontario).
Lake datum: 601.10 feet IGLD85, the Lake Superior datum.
Connecting waters: St. Marys River, draining Lake Superior to Lakes Michigan and Huron.
Navigation: Soo Locks, the world's busiest commercial lock system by tonnage in some years.
Federal jurisdiction: U.S. Coast Guard and USACE Detroit District for navigation channels; Whitefish Point Underwater Preserve.
The basinwide Lake Superior level on the homepage is the right starting point, but Whitefish Bay also has an important relationship with the St. Marys River downstream. Lake Superior outflow through the St. Marys is regulated under the International Joint Commission's Lake Superior Regulation Plan, and the historical and current flow rates through Sault Ste. Marie are an additional reference for understanding bay conditions.
Seiche activity in Whitefish Bay is modest in absolute terms because the bay's geometry damps long-period oscillation, but the bay does respond to sustained northwest wind with measurable set-up on its eastern and southern shores. Storm-driven wave action is the largest property concern on the south shore from Whitefish Point through Vermilion Point and Crisp Point, where the open-water fetch from the northwest is long enough to support fully developed seas.
Whitefish Point and the shipwreck coast at the south entrance to the bay is the most exposed shoreline in the sub-region. The Great Lakes Shipwreck Museum at Whitefish Point sits on this coast for a reason: more vessels have foundered in the waters between Whitefish Point and Munising than anywhere else on the Great Lakes, including the Edmund Fitzgerald in 1975. Shoreline property here is sparse and dominated by federal and state land.
The south Whitefish Bay coast from Whitefish Point east through Paradise, Tahquamenon Bay, and Bay Mills is a mix of state recreation land, tribal land of the Bay Mills Indian Community, and private cottage and resort development. The lower Tahquamenon River enters the bay at Tahquamenon Bay and contributes the largest single freshwater input to the bay outside the Soo. Property concerns on this coast include shoreline armoring against November storm exposure, ice ride damage during freeze and breakup, and the regulatory layering of state, federal, and tribal jurisdiction.
The Sault Ste. Marie area at the southeast end of the bay includes the cities of Sault Ste. Marie on both the Michigan and Ontario sides, the Soo Locks complex, and the upper St. Marys River. This is the most heavily engineered shoreline on Lake Superior, with extensive harbor, lock, and ore-dock infrastructure.
The Canadian north shore from Gros Cap east to Sault Ste. Marie, Ontario, completes the sub-region. Canadian jurisdiction applies here, with Environment and Climate Change Canada and the Canadian Hydrographic Service responsible for data collection.
The Michigan Ordinary High Water Mark on Lake Superior is 603.0 feet IGLD85 and applies along the Michigan portions of this sub-region. Shoreline alteration is permitted through Michigan EGLE under NREPA Part 325. The Bay Mills tribal shoreline has its own regulatory framework administered by the tribe, and the Canadian shoreline operates under Ontario provincial jurisdiction through the Ministry of Natural Resources and Forestry.
The interaction between Whitefish Bay water level and the St. Marys River outflow is unique to this sub-region. Lake Superior regulation under the IJC plan adjusts the St. Marys outflow on a monthly basis with the goal of balancing levels across the basin, and shoreline property owners along the bay sometimes see effects from regulation decisions that originated as a response to conditions on Lake Michigan-Huron downstream.
For a current reading, see the live dashboard. For broader Lake Superior context, see Lake Superior. For the downstream connecting waters, see Lake Huron and Mackinac. For neighboring Lake Superior sub-regions, see Apostle Islands, Keweenaw Peninsula, Marquette, and Thunder Bay.
For coverage of the inland trout streams that flow into Whitefish Bay through the Tahquamenon system, see the Michigan Trout Report. For Great Lakes shipping activity through the Soo, see the Great Lakes Gazette daily maritime brief.