Lake Superior

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Lake Superior
Lake-Superior.svg
Lake Superior and the other Great Lakes
North America laea relief location map with borders.jpg
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Lake Superior
Lake Superior bathymetry map.png
Lake Superior bathymetric map. [1] [2] [3] The deepest point, roughly off its southeastern shore, is marked with "×". [4] The deep trenches in its eastern part may have originated from tunnel valleys. [5] [6]
Location North America
Group Great Lakes
Coordinates 47°42′N87°30′W / 47.7°N 87.5°W / 47.7; -87.5 (Lake Superior) Coordinates: 47°42′N87°30′W / 47.7°N 87.5°W / 47.7; -87.5 (Lake Superior)
Lake type Glacial
Native nameᑭᑦᒉᐁ-ᑲᒣᐁ, Gitchi-Gami  (Ojibwe)
Primary inflows Nipigon, St. Louis, Pigeon, Pic, White, Michipicoten, Kaministiquia, Ontonagon, Tahquamenon Rivers
Primary outflows St. Marys River
Catchment area 49,300 sq mi (128,000 km2) [7]
Basin  countries Canada and the United States
Max. length350 mi (560 km) [8]
Max. width160 mi (260 km) [8]
Surface area 31,700 sq mi (82,000 km2) [7]
Average depth483 ft (147 m) [7]
Max. depth1,333 ft (406 m) [7] [9]
Water volume 2,900 cu mi (12,000 km3) [7]
Residence time 191 years
Shore length11,729 mi (2,783 km) plus 997 mi (1,605 km) for islands [10]
Surface elevation601.71 ft (183 m) (2013 average) [11]
Islands Isle Royale, Apostle Islands, Michipicoten Island, Slate Islands
Settlements
1 Shore length is not a well-defined measure.

Lake Superior is the largest of the Great Lakes of North America, and among freshwater lakes, it is the world's largest by surface area and the third-largest by volume. [lower-alpha 1] It is shared by Ontario, Canada to the north, and states in the United States in other directions: Minnesota to the west, and Wisconsin and the Upper Peninsula of Michigan to the south. [12] Lake Superior is the most northerly and most westerly of the Great Lakes chain, and the highest in elevation. It drains into Lake Huron via St. Mary's River.

Contents

Name

The Ojibwe name for the lake is gichi-gami (pronounced gitchi-gami or kitchi-gami in different dialects), [13] meaning "great sea". Henry Wadsworth Longfellow wrote this name as "Gitche Gumee" in the poem The Song of Hiawatha , as did Gordon Lightfoot in his song "The Wreck of the Edmund Fitzgerald".

According to other sources, the full Ojibwe name is Ojibwe Gichigami ("Ojibwe's Great Sea") or Anishinaabe Gichigami ("Anishinaabe's Great Sea"). [14] The 1878 dictionary by Father Frederic Baraga, the first one written for the Ojibway language, gives the Ojibwe name as Otchipwe-kitchi-gami (a transliteration of Ojibwe Gichigami). [13]

In the 17th century, the first French explorers approached the great inland sea by way of the Ottawa River and Lake Huron; they referred to their discovery as le lac supérieur (the upper lake, i.e. above Lake Huron). Some 17th-century Jesuit missionaries referred to it as Lac Tracy (for Alexandre de Prouville de Tracy). [15] After taking control of the region from the French in the 1760s following their defeat in the French and Indian War, the British anglicized the lake's name to Superior, "on account of its being superior in magnitude to any of the lakes on that vast continent". [16]

Hydrography

Lake Superior empties into Lake Huron via the St. Marys River and the Soo Locks (Sault Ste. Marie locks). Lake Superior is the largest freshwater lake in the world in area and the third largest in volume, behind Lake Baikal in Siberia and Lake Tanganyika in East Africa. The Caspian Sea, while larger than Lake Superior in both surface area and volume, is brackish. Though presently isolated, prehistorically the Caspian has been repeatedly connected to and then isolated from the Mediterranean via the Black Sea.

Lake Superior deepest point on the bathymetric map. Lake Superior bathymetry map, deepest point.png
Lake Superior deepest point on the bathymetric map.

Lake Superior has a surface area of 31,700 square miles (82,103 km2), [7] which is approximately the size of South Carolina or Austria. It has a maximum length of 350 statute miles (560  km ; 300  nmi ) and maximum breadth of 160 statute miles (257 km; 139 nmi). [8] Its average depth is 80.5 fathoms (483 ft; 147 m) with a maximum depth of 222.17 fathoms (1,333 ft; 406 m). [7] [8] [9] Lake Superior contains 2,900 cubic miles (12,100 km³) of water. [7] There is enough water in Lake Superior to cover the entire land mass of North and South America to a depth of 30 centimetres (12 in). [lower-alpha 2] The shoreline of the lake stretches 2,726 miles (4,387 km) (including islands). [7]

American limnologist J. Val Klump was the first person to reach the lowest depth of Lake Superior on July 30, 1985, as part of a scientific expedition, which at 122 fathoms 1 foot (733 ft or 223 m) below sea level is the second-lowest spot in the continental interior of the United States and the third-lowest spot in the interior of the North American continent after Iliamna Lake in Alaska (942 feet [287 m] below sea level) and Great Slave Lake in the Northwest Territories of Canada at (1,503 feet [458 m] below sea level). (Though Crater Lake is the deepest lake in the United States and deeper than Lake Superior, Crater Lake's elevation is higher and consequently its deepest point is 4,229 feet (1,289 m)above sea level.)

While the temperature of the surface of Lake Superior varies seasonally, the temperature below 110 fathoms (660 ft; 200 m) is an almost constant 39 °F (4 °C). This variation in temperature makes the lake seasonally stratified. Twice per year, however, the water column reaches a uniform temperature of 39 °F (4 °C) from top to bottom, and the lake waters thoroughly mix. This feature makes the lake dimictic. Because of its volume, Lake Superior has a retention time of 191 years. [17] [18]

Annual storms on Lake Superior regularly feature wave heights of over 20 feet (6 m). [19] Waves well over 30 feet (9 m) have been recorded. [20]

Tributaries

Lake Superior basin Lake Superior Watershed.png
Lake Superior basin

Lake Superior is fed by more than 200 rivers, including the Nipigon River, the St. Louis River, the Pigeon River, the Pic River, the White River, the Michipicoten River, the Bois Brule River and the Kaministiquia River. The lake's outlet at St. Marys River has a relatively steep gradient with rapids. The Soo Locks enable ships to bypass the rapids and to overcome the 25-foot (8 m) height difference between Lakes Superior and Huron.

Water levels

A frozen Duluth Harbor Entrance Duluth Harbor Entrance in February (25632302346).jpg
A frozen Duluth Harbor Entrance

The lake's average surface elevation is 600 feet (183 m) [8] [17] above sea level. Until approximately 1887, the natural hydraulic conveyance through the St. Marys River rapids determined the outflow from Lake Superior. By 1921, development in support of transportation and hydroelectric power resulted in gates, locks, power canals and other control structures completely spanning St. Marys rapids. The regulating structure is known as the Compensating Works and is operated according to a regulation plan known as Plan 1977-A. Water levels, including diversions of water from the Hudson Bay watershed, are regulated by the International Lake Superior Board of Control, which was established in 1914 by the International Joint Commission.

Lake Superior's water level was at a new record low in September 2007, slightly less than the previous record low in 1926. [21] Water levels recovered within a few days. [22]

Historic high water 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 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 datum. [23] 2019 and 2020 set new high-water records in nearly every month. [23]

Historic low water The lake's lowest levels occur in March and April. The normal low-water mark is 0.33 feet (0.10 m) below datum. In the winter of 1926 Lake Superior reached its lowest recorded level at 1.58 feet (0.48 m) below datum. [23] Additionally, the entire first half of the year (January to June) included record low months. The low water was a continuation of the dropping lake levels from the previous year, 1925, which set low-water records for October through December. During the nine-month period of October 1925 to June 1926, water levels ranged from 1.58 feet (0.48 m) to 0.33 feet (0.10 m) below Chart Datum. [23] In the summer of 2007 monthly historic lows were set; August at 0.66 feet (0.20 m), September at 0.58 feet (0.18 m). [23]

Climate change

According to a study by professors at the University of Minnesota Duluth, Lake Superior may have warmed faster than its surrounding area. [24] Summer surface temperatures in the lake appeared to have increased by about 4.5 °F (2.5 °C) between 1979 and 2007, compared with an approximately 2.7 °F (1.5 °C) increase in the surrounding average air temperature. The increase in the lake's surface temperature may be related to the decreasing ice cover. Less winter ice cover allows more solar radiation to penetrate and warm the water. If trends continue, Lake Superior, which freezes over completely once every 20 years, could routinely be ice-free by 2040. [25]

Warmer temperatures could lead to more snow in the lake effect snow belts along the shores of the lake, especially in the Upper Peninsula of Michigan. Two recent consecutive winters (2013–2014 and 2014–2015) brought high ice coverage to the Great Lakes, and on March 6, 2014, overall ice coverage peaked at 92.5%, the second-highest in recorded history. [26] Lake Superior's ice coverage further beat 2014's record in 2019, reaching 95% coverage. [27]

Geography

Lake Superior, by Walter Shirlaw Brooklyn Museum - Lake Superior - Walter Shirlaw.jpg
Lake Superior, by Walter Shirlaw

The largest island in Lake Superior is Isle Royale in Michigan. Isle Royale contains several lakes, some of which also contain islands. Other well-known islands include Madeline Island in Wisconsin, Michipicoten Island in Ontario, and Grand Island (the location of the Grand Island National Recreation Area) in Michigan.

The larger cities on Lake Superior include the twin ports of Duluth, Minnesota and Superior, Wisconsin; Thunder Bay, Ontario; Marquette, Michigan; and the twin cities of Sault Ste. Marie, Michigan, and Sault Ste. Marie, Ontario. Duluth-Superior, at the western end of Lake Superior, is the most inland point on the Saint Lawrence Seaway and the most inland port in the world.

Among the scenic places on the lake are Apostle Islands National Lakeshore, Brockway Mountain Drive on the Keweenaw Peninsula, Isle Royale National Park, Porcupine Mountains Wilderness State Park, Pukaskwa National Park, Lake Superior Provincial Park, Grand Island National Recreation Area, Sleeping Giant (Ontario) and Pictured Rocks National Lakeshore. The Great Lakes Circle Tour is a designated scenic road system connecting all of the Great Lakes and the St. Lawrence River. [28]

Climate

Lake Superior's size reduces the severity of the seasons of its humid continental climate (more typically seen in locations like Nova Scotia). [29] The water surface's slow reaction to temperature changes, seasonally ranging between 32 and 55 °F (0–13 °C) around 1970, [30] helps to moderate surrounding air temperatures in the summer (cooler with frequent sea breeze formations) and winter, and creates lake-effect snow in colder months. The hills and mountains that border the lake hold moisture and fog, particularly in the fall.

North American cratons and basement rock, showing the formation of the Midcontinent Rift containing today's Lake Superior North america basement rocks.png
North American cratons and basement rock, showing the formation of the Midcontinent Rift containing today's Lake Superior

Geology

The rocks of Lake Superior's northern shore date back to the early history of the earth. During the Precambrian (between 4.5 billion and 540 million years ago) magma forcing its way to the surface created the intrusive granites of the Canadian Shield. [31] These ancient granites can be seen on the North Shore today. It was during the Penokean orogeny, part of the process that created the Great Lakes tectonic zone, that many valuable metals were deposited. The region surrounding the lake has proved to be rich in minerals, with copper, iron, silver, gold and nickel the most frequently mined. Notable production includes gold from the Hemlo mine near Marathon, copper from the Keweenaw Peninsula and the Mamainse Point Formation, iron from the Gogebic Range, silver at Silver Islet, and uranium at Theano Point.

The mountains steadily eroded, depositing layers of sediments that compacted and became limestone, dolomite, taconite and the shale at Kakabeka Falls. The continental crust was later riven, creating one of the deepest rifts in the world. [32] The lake lies in this long-extinct Mesoproterozoic rift valley, the Midcontinent Rift. Magma was injected between layers of sedimentary rock, forming diabase sills. This hard diabase protects the layers of sedimentary rock below, forming the flat-topped mesas in the Thunder Bay area. Amethyst formed in some of the cavities created by the Midcontinent Rift, and there are several amethyst mines in the Thunder Bay area. [33]

Basaltic columns along Lake Superior Basaltic columns Lake Superior.png
Basaltic columns along Lake Superior

Lava erupted from the rift and formed the black basalt rock of Michipicoten Island, Black Bay Peninsula, and St. Ignace Island.

In the most recent geological history, during the Wisconsin glaciation 10,000 years ago, ice covered the region at a thickness of 1.25 miles (2 km). The land contours familiar today were carved by the advance and retreat of the ice sheet. The retreat left gravel, sand, clay and boulder deposits. Glacial meltwaters gathered in the Superior basin creating Lake Minong, a precursor to Lake Superior. [34] Without the immense weight of the ice, the land rebounded, and a drainage outlet formed at Sault Ste. Marie, becoming today's St. Mary's River.

History

Historical map of Lake Superior and Northern Michigan, published 1879 by Rand McNally Northern Michigan and Lake Superior.jpg
Historical map of Lake Superior and Northern Michigan, published 1879 by Rand McNally

The first people came to the Lake Superior region 10,000 years ago after the retreat of the glaciers in the Last Glacial Period. They are known as the Plano, and they used stone-tipped spears to hunt caribou on the northwestern side of Lake Minong. The Shield Archaic peoples arrived around 5000 BC; evidence of this culture can be found at the eastern and western ends of the Canadian shore. They used bows and arrows, paddled dugout canoes, fished, hunted, mined copper for tools and weapons, and established trading networks. They are believed to be the direct ancestors of the Ojibwe and Cree. [35] The Laurel people (c. 500 BC to AD 500) developed seine net fishing, evidence being found at rivers around Superior such as the Pic and Michipicoten. The Terminal Woodland Indians were evident in the area from 900 AD to 1650. They were Algonquian peoples who hunted, fished and gathered berries. They used snowshoes, birch bark canoes and conical or domed lodges. At the mouth of the Michipicoten River, nine layers of encampments have been discovered. Most of the Pukaskwa Pits were likely made during this time. [35]

Pictographs at Lake Superior Provincial Park, Ontario AgawaRock23.jpg
Pictographs at Lake Superior Provincial Park, Ontario

The Anishinaabe people, which includes the Ojibwe or Chippewa, have inhabited the Lake Superior region for over five hundred years and were preceded by the Dakota, Fox, Menominee, Nipigon, Noquet and Gros Ventres. After the arrival of Europeans, the Anishinaabe made themselves middle-men between the French fur traders and other Native peoples. They soon became the dominant Native American nation in the region: they forced out the Sioux and Fox and won a victory against the Iroquois west of Sault Ste. Marie in 1662. By the mid-18th century, the Ojibwe occupied all of Lake Superior's shores. [36]

Reconstructed Great Hall, Grand Portage National Monument, Minnesota 050820 GrandPortageNationalMonument.jpg
Reconstructed Great Hall, Grand Portage National Monument, Minnesota

In the 18th century, as the booming fur trade supplied Europe with beaver hats, the Hudson's Bay Company had a virtual monopoly in the region until 1783, when the rival North West Company was formed. The North West Company built forts on Lake Superior at Grand Portage, Fort William, Nipigon, the Pic River, the Michipicoten River, and Sault Ste. Marie. But by 1821, with competition harming the profits of both, the companies merged under the Hudson's Bay Company name. Many towns around the lake are current or former mining areas, or engaged in processing or shipping. Today, tourism is another significant industry: the sparsely populated Lake Superior country, with its rugged shorelines and wilderness, attracts vacationers and adventurers.

Shipping

"Ice blockade in Marquette Harbor, June 1873", stereoscopic photo Ice blockade in Marquette Harbor, June 1873, by Childs, B. F. 2.jpg
"Ice blockade in Marquette Harbor, June 1873", stereoscopic photo

Lake Superior has been an important link in the Great Lakes Waterway, providing a route for the transportation of iron ore as well as grain and other mined and manufactured materials. Large cargo vessels called lake freighters, as well as smaller ocean-going freighters, transport these commodities across Lake Superior. Shipping was slow to arrive at Lake Superior in the 19th century. The first steamboat to run on the lake was the Independence in 1847, whereas the first steamers on the other Great Lakes began sailing in 1816. [37] [38] Ice closes the lake shipping from mid-January to late March. Exact dates for the shipping season vary each year, [39] depending on weather conditions that form and break the ice.

Shipwrecks

The southern shore of Lake Superior between Grand Marais, Michigan, and Whitefish Point is known as the "Graveyard of the Great Lakes;" more ships have been lost around the Whitefish Point area than any other part of Lake Superior. [40] These shipwrecks are now protected by the Whitefish Point Underwater Preserve. Storms that claimed multiple ships include the Mataafa Storm in 1905 and the Great Lakes Storm of 1913.

Wreckage of SS Cyprus—a 420-foot (130 m) ore carrier that sank on October 11, 1907, during a Lake Superior storm in 77 fathoms (460 ft or 140 m) of water—was located in August 2007. Built in Lorain, Ohio, Cyprus was launched August 17, 1907, and was lost on her second voyage hauling iron ore from Superior, Wisconsin, to Buffalo, New York, with the sole survivor among her 23 crew being Charles G. Pitz. [41] In 1918 the last warships to sink in the Great Lakes, French minesweepers Inkerman and Cerisoles, vanished in a Lake Superior storm, perhaps upon striking the uncharted danger of the Superior Shoal in an otherwise deep part of the lake. With 78 crewmembers dead, their sinking marked the largest loss of life on Lake Superior to date.

SS Edmund Fitzgerald was the latest ship to sink in Lake Superior, 15 nautical miles (28 km; 17 mi) from Whitefish Point in a storm on November 10, 1975. The wreck was immortalized by Gordon Lightfoot in his ballad "The Wreck of the Edmund Fitzgerald". All 29 crew members died, and no bodies were recovered. Edmund Fitzgerald was battered so intensely by Lake Superior that the 729-foot (222 m) ship split in half; her two pieces currently lie approximately 170 feet (52 m) apart in a depth of 88 fathoms (530 ft or 160 m).

Lightfoot sings that "The lake, it is said, never gives up her dead". [42] This is because of the unusually cold water, under 36 °F (2 °C) on average around 1970. [30] Normally, bacteria decaying a sunken body will bloat it with gas, causing it to float to the surface after a few days. But Lake Superior's water is cold enough year-round to inhibit bacterial growth, and bodies tend to sink and never resurface. [43] Joe MacInnis reported that in July 1994, explorer Frederick Shannon's Expedition 94 to the wreck of Edmund Fitzgerald discovered a man's body near the port side of her pilothouse, not far from the open door, "fully clothed, wearing an orange life jacket, and lying face down in the sediment". [44]

Bedrock shoreline, Neys Provincial Park, Ontario Lake Superior at Neys Provincial Park Ontario.jpg
Bedrock shoreline, Neys Provincial Park, Ontario
Pictured Rocks National Lakeshore, Michigan Miners Castle, Pictured Rocks National Lakeshore.jpg
Pictured Rocks National Lakeshore, Michigan

Ecology

More than 80 species of fish have been found in Lake Superior. Species native to the lake include: banded killifish, bloater, brook trout, burbot, cisco, lake sturgeon, lake trout, lake whitefish, longnose sucker, muskellunge, northern pike, pumpkinseed, rock bass, round whitefish, smallmouth bass, walleye, white sucker and yellow perch. In addition, many fish species have been either intentionally or accidentally introduced to Lake Superior: Atlantic salmon, brown trout, carp, chinook salmon, coho salmon, freshwater drum, pink salmon, rainbow smelt, rainbow trout, round goby, ruffe, sea lamprey and white perch. [45] [46]

Lake Superior has fewer dissolved nutrients relative to its water volume than the other Great Lakes and so is less productive in terms of fish populations and is an oligotrophic lake. This is a result of the underdeveloped soils found in its relatively small watershed. [17] It is also a reflection of relatively small human population and small amount of agriculture in its watershed. However, nitrate concentrations in the lake have been continuously rising for more than a century. They are still much lower than levels considered dangerous to human health; but this steady, long-term rise is an unusual record of environmental nitrogen buildup. It may relate to anthropogenic alternations to the regional nitrogen cycle, but researchers are still unsure of the causes of this change to the lake's ecology. [47]

As for other Great Lakes fish, populations have also been affected by the accidental or intentional introduction of foreign species such as the sea lamprey and Eurasian ruffe. Accidental introductions have occurred in part by the removal of natural barriers to navigation between the Great Lakes. Overfishing has also been a factor in the decline of fish populations. [12]

See also

General

Notes

  1. The Caspian Sea is saline.
  2. North America (2.47×107 km²) and South America (1.78×107 km²) combined cover 4.26×107 km². Lake Superior's volume (1.20×104 km³) over 4.26×107 km² gives a depth of 0.282 m.

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St. Marys River (Michigan–Ontario)

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Bad River Band of the Lake Superior Tribe of Chippewa Indians

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Underwater panther

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<i>Mataafa</i> Storm

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Michipicoten Island Canadian island in Lake Superior

Michipicoten Island is an island in Ontario, Canada, in the northeastern part of Lake Superior, about 175 kilometres (109 mi) northwest of Sault Ste. Marie and 65 kilometres (40 mi) southwest of Wawa, Ontario. At its closest point to mainland Ontario, the island is located about 16 kilometres (9.9 mi) from the mainland. It falls within the boundaries of Thunder Bay District. The second largest island in Lake Superior, Michipicoten Island is 27 kilometres (17 mi) long and 10 kilometres (6.2 mi) wide at its widest point.

Whitefish Point Underwater Preserve Reserve to protect and conserve shipwrecks and historical resources in Lake Superior

The Whitefish Point Underwater Preserve was established in 1987 to protect and conserve shipwrecks and historical resources on 376 square miles (970 km2) of Lake Superior bottomlands in Whitefish Bay and around Whitefish Point, Michigan. The formation of the Michigan Underwater Preserves helped stop controversy over artifact removal from shipwrecks of this area. The preserve is now known for deep, well preserved shipwrecks in clear water accessible to scuba divers with technical skill and experience. The preserve is one of the last places in the Great Lakes to observe shipwrecks without zebra mussel encrustation.

Caribou Island (near Michipicoten Island)

Caribou Island is an uninhabited island in the eastern end of Lake Superior, 40 kilometres (25 mi) south of Michipicoten Island. It lies entirely within the territorial waters of Canada although only about five kilometres from the international border between Canada and the United States. It is approximately 5.6 kilometres (3.5 mi) long and 2.4 kilometres (1.5 mi) wide, and 1,600 acres (647 ha) in area. The interior is low scrub and bog with small lakes, Little Italy, Hambone, and Deer Lake among many unnamed ones. Several of the lakes are maintained by beavers and all are several feet above Lake Superior.

SS <i>Myron</i>

SS Myron was a wooden steamship built in 1888. She spent her 31-year career as lumber hooker, towing schooner barges on the Great Lakes. She sank in 1919, in a Lake Superior November gale. All of her 17 crew members were killed but her captain survived. He was found drifting on wreckage near Ile Parisienne. Her tow, the Miztec, survived. Myron defied the adage that Lake Superior "seldom gives up her dead" when all 17 crewmembers were found frozen to death wearing their life jackets. Local residents chopped eight of Myron's sailors from the ice on the shore of Whitefish Bay and buried them at the Mission Hill Cemetery in Bay Mills Township, Michigan.

<i>Miztec</i> (schooner barge)

The Miztec was built as a 3-masted schooner in 1890. She was later converted to a schooner barge and served as a consort for lumber hookers on the Great Lakes. She escaped destruction in a severe 1919 storm that sank her longtime companion, the SS Myron, only to sink on the traditional day of bad luck, Friday the 13th, 1921, with the loss of all hands. She came to rest on Lake Superior's bottom off Whitefish Point near the Myron.

<i>Michipicoten</i> (1952 ship) Self discharging lake freighter

Michipicoten is a self-discharging lake freighter owned and operated by Canadian shipping firm Lower Lakes Towing. Michipicoten primarily hauls taconite from Marquette, Michigan to the Algoma Steel Mill in Sault Ste. Marie, Ontario. It has a capacity of 22,300 tons, a speed of 12 knots (14 mph), and a length of 689 feet 6 inches (210.2 m).

<i>Thomas Friant</i> (ship)

Thomas Friant was a wooden-hulled ferry that served on the Great Lakes from her construction in 1884 to her sinking in 1924. In January 1924, while gillnetting out of Two Harbors, Minnesota in Lake Superior, she was holed by ice, and sank with no fatalities. In 2004 her wreck was discovered in over 300 feet (91 m) of water in pristine condition. The wreck of Thomas Friant was listed on the National Register of Historic Places in 2019.

References

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    (the general reference to NGDC because this lake was never published, compilation of Great Lakes Bathymetry at NGDC has been suspended).
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Further reading