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The lake's water level fluctuates from month to month, with the highest lake levels in October and November. The normal high-water mark is 1.17 feet (0.36 m) above the datum (601.1 ft or 183.2 m). In the summer of 1985, Lake Superior reached its highest recorded level at 2.33 feet (0.71 m) above the datum.
A chart datum is the water level surface serving as origin of depths displayed on a nautical chart and for reporting and predicting tide heights. A chart datum is generally derived from some tidal phase, in which case it is also known as a tidal datum. [1] Common chart datums are lowest astronomical tide (LAT) [1] and mean lower low water (MLLW).
The Lake Superior Reserve and the Old Woman Creek (Lake Erie in Ohio) are the only Great Lakes freshwater estuaries in the Reserve System. This subregion contains all of Lake Superior and its freshwater estuaries. One of these estuaries formed where the waters of the St. Louis River enter Lake Superior. Lake Superior, which is bordered by ...
The water level of Lake Michigan–Huron had remained fairly constant over the 20th century. [36] Recent lake levels include record low levels in 2013 in Lakes Superior, Erie, and Michigan-Huron, [37] followed by record high levels in 2020 [38] in the same lakes. The water level in Lake Ontario has remained relatively constant in the same time ...
The Minnesota portion of Lake Superior is the largest at 962,700 acres (3,896 km 2) and deepest (at 1,290 ft (390 m), 393 m) body of water in the state. [11] Minnesota has 6,564 natural rivers and streams that cumulatively flow for 69,000 miles (111,000 km). [11]
Sigman said the lake is at 298 feet above mean sea level, which is 6 inches above normal. If the weather forecast holds, he expects the lake will return to its normal level in a week or so.
US and Canadian officials are investigating after a 689-foot ship collided with an underwater object and began taking on water in Lake Superior, the US Coast Guard says.
The Great Lakes water resource region is one of 21 major geographic areas, or regions, in the first level of classification used by the United States Geological Survey to divide and sub-divide the United States into successively smaller hydrologic units. These geographic areas contain either the drainage area of a major river, or the combined ...