User:Melodypie21/sandbox

Coordinates: 43°49′28″N 88°57′52″W / 43.82444°N 88.96444°W / 43.82444; -88.96444
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Green Lake
Big Green Lake
Location of Green Lake in Wisconsin, USA.
Location of Green Lake in Wisconsin, USA.
Green Lake
Location of Green Lake in Wisconsin, USA.
Location of Green Lake in Wisconsin, USA.
Green Lake
Hydrographic Map of Green Lake Wisconsin
LocationGreen Lake County, Wisconsin, United States
Coordinates43°49′28″N 88°57′52″W / 43.82444°N 88.96444°W / 43.82444; -88.96444
TypeDimictic
EtymologyGreen appearance of the water
Part ofBig Green Lake Watershed
Primary inflowsSilver Creek,

White Creek, Dakin Creek, Hill Creek, Wurches Creek, Roy Creek, Spring Creek,

Assembly Creek
Primary outflowsPuchyan River
Catchment area277.9 km2 (107.3 sq mi)
Basin countriesUnited States
Managing agencyGreen Lake Association, Green Lake Sanitary District
Max. length11.75 km (7.30 mi)
Max. width3.219 km (2.000 mi)
Surface area2,973 ha (7,350 acres)
Average depth30.48 m (100.0 ft)
Max. depth72.24 m (237.0 ft)
Water volume0.9390 km3 (761,300 acre⋅ft)
Residence time21 years
Salinity502.80 - 532.88 uS/cm
Shore length143.94 km (27.30 mi)
Surface elevation242.3 m (795 ft)[1]
Max. temperature27.2 °C (81.0 °F) Highest average, 2018[2]
Frozen87 days[3]
SettlementsGreen Lake, Wisconsin
1 Shore length is not a well-defined measure.

Green Lake — also known as Big Green Lake (to distinguish it from Little Green Lake, which is near Markesan)— is a lake in Green Lake County, Wisconsin, United States. Its namesake comes from the green color of its deep waters.[4] The city of Green Lake is located on the northeast shore. There are four organizations associated with Green Lake: Green Lake Association, Green Lake Property Owners Association, Green Lake Sanitary District, and Green Lake Conservancy (also known as Green Lake Preservation Society).

Formed by morainal damming of a deep river valley during the Wisconsin glaciation, Green Lake has a maximum depth of 72.24 m (237.0 ft), making it the deepest natural inland lake in Wisconsin. The lake covers 29.72 km2 (7,340 acres) and has an average depth of 30.48 m (100.0 ft). Green Lake has 43.94 km (27.30 mi) of diverse shoreline, ranging from sandstone bluffs to marshes.[5] Green Lake is dimictic, meaning that the water column mixes twice each year with a period of temperature stratification during the summer months.

History[edit]

Pleasant Point in 1910

First Settlers[edit]

The Ho-Chunk Nation of Wisconsin, also referred to as the Winnebago, were some of the first residents in the Green Lake Area.[6] Green Lake, also known as Daycholah, is a spiritual place for the Winnebago. One legend describes how one must bring gifts for the Water Spirit that lives under the lake in order to enter.[7] With the increase of European settlers, the Winnebago were subject to forced relocation by the United States government several times. Once they were removed from the Green Lake area, they were moved to Iowa until the establishment of a reservation in Blue Earth County, Minnesota.[8]

Chief Highknocker[edit]

The last reigning chief of the Green Lake area. He was born in 1820 with the given name Henaga. He spent most of his life around the lake but was forced to move further north because of the ever-increasing amount of settlers. He continued visiting Green Lake every summer with other members of the tribe. On August 12th, 1911, at the age of 91, he drowned after getting a cramp while swimming in the lake. His grave is marked by a large boulder with an inscription from the community.[7]

European Settlement[edit]

In In 1836, Wisconsin land could be purchased through the Green Bay Land Office at $1.25 per acre.[7] The namesake of Dartford, now called Green Lake, Anson Dart built a dam with Smith Fowler and his own son in an effort to raise the lake level. The next year, Dart built a sawmill that used the mill race created by the dam. The dam's success in raising lake level allowed different types of mills to be constructed around Green Lake.

Lone Tree Farm[edit]

Because of the proximity to the lake, the land was ideal for farming. In 1888, Victor and Jessie Lawson purchased a plot of land called Lone Tree Point that would later become Lone Tree Farm. Victor Lawson was a newspaper editor and philanthropist, and his wife Jessie was the primary planer for their estate. Together, the Lawson's developed approximately 1,100 acres of land that is still used today as a religious conference center. Some features of the estate include roads, a boathouse, and, at the time, the largest dairy barn in Wisconsin.[6]

Geography[edit]

The City of Green Lake, with a population of 828 as of 2018[9], is located on the northeast shore at the outflow of the Puchyan River.[5] There are six public lands and parks on or near the lake: Sunset Park, Daycholah Lookout, Spring Lake County Park, Hattie Sherwood Park, Deacon Mills Park, and Playground Park. The lake has three beaches: Hattie Sherwood Beach, Dodge Country Park Beach, and Sunset County Park. There are eight public access boat landings on Green Lake.[10]

Green Lake lies within the Big Green Lake drainage basin which covers three counties. The majority of the drainage basin is in Green Lake County, with small portions of the drainage basin within the western edges of both Winnebago and Fond Du Lac counties. It lies within the Upper Fox River drainage basin, which is part of the Great Lakes drainage basin.[11]

Land Use in Green Lake Watershed[12]

Land Cover Acres % Total Area
Agriculture 44,639.76 65
Open Land/Water 10,665.47 15.53
Forest 6,016.07 8.76
Wetland 3,935.17 5.73
Suburban 2,211.38 3.22
Urban 597.49 0.87
Grassland 556.28 0.81
Barren Land 48.07 0.07
Total 68,676.55 100

Geology[edit]

The shoreline of Green Lake along Lone Tree Point

The Green Lake basin exists within a river-carved valley that originated prior to the Wisconsin glaciation. It is likely that the movement of the glacier also deepened the valley, as well as smoothed its sides. The valley finally flooded when a recessional moraine about 90 m (300 ft) high blocked the exit of water at the west end of the basin during the Cary stage of glacial reduction.[13] The basin is composed mainly of Potsdam sandstone. Beginning just below the water surface is a layer of Madison Sandstone (7.5 m (25 ft) thick), followed by dolomite, St. Peter Sandstone (30 m (98 ft) thick), and Trenton limestone. The shoreline is diverse, ranging from sandy beaches to swamps to steep cliffs where the bedrock is exposed, such as in the image on the left.[14]

The glacial activity that created the Green Lake moraine also sculpted the surrounding topography. The land is covered in drumlins, parallel troughs and ridges with rolling tops that rise to a height of 30–60 m (98–197 ft). These ridges are covered in a thin layer of glacial till that is composed mainly of sand eroded from the native sandstones in the area.[14]

The water level increase caused by the dam at the head of the Puchyan has had profound impacts on the shoreline of the lake, mainly in the creation of many immature beaches. The maturity of these beaches is dictated by the composition of the shore, where looser till material erodes much more quickly than even the fragile sections of exposed bedrock. These looser areas mature more quickly. In more mature areas, boulders from the strata that are kept pushed against the shore by ice provide protection from erosion.[14]

Hydrology[edit]

Drainage Basin[edit]

At 72.24 m (237.0 ft) deep and with a volume of 0.9390 km3 (761,300 acre⋅ft),[5] Green Lake is the deepest natural inland lake in the state and second-largest by volume.[13] Only Lake Wazee, a man-made lake, is deeper, and only Lake Winnebago has a larger volume. The deepest and steepest part of the basin is near the west end, while the eastern third is more shallow. The maximum gradient is 33% at Lucas Bluff, a large rock face on the southeast shore. There are shoals at Malcom Bay and the east end of the lake[14] The lake has a maximum fetch of 11.75 km (7.30 mi). This allows a theoretical maximum surface wave height of 1.14 m (3.7 ft).

Green Lake is within the Big Green Lake Watershed, which has a catchment area is 277.9 km2 (107.3 sq mi). The drainage basin lies mostly in Green Lake County, but extends east into Fond du Lac and Winnebago County. In addition to Green Lake, the drainage basin includes Spring Lake and the East and West Twin Lakes.[12]

Tributaries and Outlet[edit]

The components of the Green Lake basin water budget are, in approximate percentages: direct precipitation, 51%; surface water, 41%; ground water, 8%. Eight creeks make up the surface water supply, the largest being Silver Creek, which flows into the east end of the lake. The remaining seven are Hill Creek, White Creek, Dakin Creek, Wurches Creek, Roy Creek, Spring Creek, Assembly Creek. The primary outflow is the Puchyan River, a tributary to the upper Fox River that lies in the Lake Michigan drainage basin.[13] This makes Green Lake a drainage lake, a lake in which surface outflow dominates.[15] A dam in the outlet keeps the water level in the lake around 1.52 m (5.0 ft) higher than the natural level.[14] Green Lake has a retention time of 21 years, relatively long for a temperate lake of its size. This has implications for lake health because with very low rates of flushing, there is a large lag for reversion of fertility changes.[13]

Water Chemistry and Quality[edit]

Oxygen[edit]

Dissolved oxygen (DO) is key to the health of aquatic ecosystems. It is essential for the metabolism of all aerobic organisms, therefore controlling their distribution, behavior, and growth within the ecosystem. Oxygen also reacts with many other compounds, influencing their availability and chemical forms.[15] Due to its thermal stratification, the concentration of DO in Green Lake decreases through the thermocline and into the hypolimnion.[16] One of the most interesting characteristics of the Green Lake DO profile is a pronounced metalimnetic oxygen minimum, documented through the literature since the 1900s at a depth of 10 m (33 ft) and with a thickness of ~3 m (9.8 ft). The dissolved oxygen drops from ~9 mg/L to ~4 mg/L before rebounding and slowly decreasing into the hypolimnion. Based on other chemical characteristics such as pH and chlorophyll fluorescence at this depth, it is likely that the metalinetic oxygen minimum results from a concentration of respiring plankton.[17] Because the DO level is <5 mg/L, the lake was classified as "impaired" by the Wisconsin DNR in 2014. The low DO in this band poses a danger for aerobic organisms and has the potential to expand.[13]

Another threat facing the lake is hypolimnetic oxygen depletion. A paleolimnological sediment analysis conducted in the deep basins of the lake showed trends of oxygen depletion since 1950. Though the deep waters are not yet devoid of oxygen, the oxygen is being depleted faster than it was in 1950. This is a result of increased nutrient availability in the epilimnion, which increases biological productivity. As these organisms die, sink, and aerobically decompose, oxygen is depleted.[13]

Nitrogen and Phosphorus[edit]

Nitrogen is essential in many biomolecules, such as amino acids, and has roles in biosignalling. It is also a major excretory product of livestock and a key ingredient in fertilizers, both of which play a key role in the agriculturally-dense Big Green Lake drainage basin.[15][12] Phosphorus is also a key element in living things, constituting molecules such nucleic acids and membranes. Like nitrogen, it is a major excretory product of livestock and a key ingredient in fertilizers.[15] Nitrogen and Phosphorus are often identified as limiting nutrients in aquatic ecosystems,[15] and changes in their abundance in Green Lake have had profound effects on the ecology of the Lake.[13]

The specific conductance is 502.80 - 532.88 microSiemens per centimeter.[17]

Flora and Fauna[edit]

Fishes[edit]

Green Lake is a highly productive and highly utilized fishery. Because of its depth, it supports both a warm-water and cold-water fishery, though species of the warm-water fishery predominate.[13] 40 species of fish have been documented in Green Lake.[18]

Northern Pike

Common Warm-water Fishery Species[edit]

Lake Trout

Cold-water Fishery[edit]

pancake ice along the south shoreline of Green Lake, near Tuleta Hills

Ecology[edit]

Ecology of the Warm-water Fishery[edit]

Both small and largemouth bass reproduce naturally and maintain stable populations in the lake. Largemouth are susceptible to habitat loss due to the low amount of vegetated littoral habitat. Smallmouth bass thrive in the lake due to the rocky and steep bottom, and walleye naturally maintain a low population in Green Lake. Targeted fishing, limited littoral habitat, late spring warming, and predation on eggs, fry, and fingerlings limit the size of the population.[13] The Wisconsin Department of Natural Resources (WDNR) does not stock walleye in the lake due to genetic concerns. Similarly, northern pike are also limited by spawning habitat degradation by development, boating, and carp. Angling also puts heavy pressure on the population, so size and bag limits have been implemented to help reduce the strain. Panfish maintain healthy populations, but angling and shoreline development represent main threats. The loss of woody vegetation along the shoreline is especially damaging.[13]

Studies have also focused on the health of non-game fish populations as they related to ecosystem health. In Green Lake, species such as the blackchin shiner, Iowa darter, and mottled sculpin are all intolerant to environmental disruption and therefore serve as indicator species of lake health. In addition to carp disturbance, shoreline development, and boating disturbance, cyanobacteria blooms, zebra mussels, and filamentous algae growth may also represent limiting factors to habitat health and fish growth.[18]

Ecology of the Cold-water Fishery[edit]

Cisco are native to Green Lake and are regularly fished. They are very sensitive to environmental change, and their populations are in flux. Recent surveys in Green Lake have shown that the cisco population has slightly declined, possibly due to the ecological effects of eutrophication. Climate change severely threatens cisco, and their populations could be reduced by 30-70%. Lake trout are the prized species of the cold-water fishery, and the WDNR stocks 25,000 yearlings annually. These fish are raised at the Green Lake Cooperative fish rearing facility, which is owned by the Green Lake Sanitary District and operated in conjunction with the WDNR. There have been reports of scarring on adult lake trout, suggesting possible conflict with muskellunge in the boundaries between the warm and cold-water fisheries. A main threat facing the fish of the cold-water fishery is oxygen depletion, especially in the deep west basin.[13] The Wisconsin inland lake record lake trout was caught on Big Green Lake by Joseph Gotz on June 1, 1957 and weighed 35 lb 4 oz (16.0 kg). The Wisconsin record cisco was caught on Big Green Lake on June 12, 1969 by Joe Miller and weighed 4 lb 10.5 oz (2.11 kg).[19]

Aquatic Vegetation and Algae[edit]

A majority of aquatic vegetation was found growing at a depth of 14 feet (4.27 m) and a maximum depth of 23 feet (7.01 m). Of all the observed species, coontail and hybrid water milfoil were the highest frequency of occurrence. Coontail is a common aquatic species in Wisconsin and able to survive and thrive in areas with light deficiency as it receives a majority of nutrients from the water. The ability to grow in deeper areas of the littoral zone allows coontail to provide habitat for invertebrates and fish.[20] Species like common carp and Zebra mussels have contributed to the degeneration of shallow aquatic plant species. The high nutrient concentrations attribute to algal growth that may have future negative effects.[13]

Environmental Concerns[edit]

Pollution[edit]

Prior to European settlement, the lake was considered to be oligotrophic, meaning that it had low biological productivity and good water quality based on a trophic state index. Green Lake is now considered to be mesotrophic lake because of increased nutrient loading from both natural and anthropogoenic causes. Water quality has since decreased and is considered “impaired” per standards laid out in the Clean Water Act by the Environmental Protection Agency.[4]

Invasive Species[edit]

Curly-leaf pondweed

Invasive Flora[edit]

Hybrid water milfoil and curly-leaf pondweed have been documented in Green Lake since 1971. A 2014 survey showed that hybrid water milfoil increased in dominance to make up 25% of the aquatic plant species. The most frequently found singular plant species in the lake in 2015 was Eurasian water milfoil at 20% of relative frequency. Another invasive plant species, the spiny naiad (Najas marina), was documented in a 2007 WDNR survey, but was not observed in the 2014 survey.[20]

Zebra mussel

Invasive Fauna[edit]

Common carp have contributed to the degradation of plant species and fish spawning locations in the shallow areas of the lake in addition to the Silver Creek inflow and nearby County K Marsh. Placing carp barriers have contributed to a regeneration of the aquatic plant species in the Silver Creek inflow, but not for the County K Marsh. The unsuccessful control in County K Marsh is attributed to the high levels of phosphorus that come from the area and enter the lake.[13] Both Zebra and Quagga mussel species positively influence the growth of the green algae species, Cladophora glomerata.[21] The Cladophora population has been steadily increasing since 1921 to now nuisance levels. This particular green algae thrives in the high nutrient concentrations and its high density has ecological consequences. Some of these include encouraging the expansion of zebra and quagga mussel populations and inhibiting the spawning of native fish populations.[22]

Development[edit]

Many large, wooden hotels and one short-lived casino populated the north shore during the late 19th century in the city of Green Lake, but most have burned down. One was the Pleasant Point, which opened in the early 1880s,[23] was criticized for the exclusion of Jewish patrons in 1923,[24][25] and burned down sometime before 1956.[26]

Recreation[edit]

A line of Nite iceboats on Green Lake

The lake and its surrounding topography have opportunities for a large range of recreational activities year-round.

During the summer, activities such as boating, water skiing, wakeboarding, tubing, swimming, sailing, jet skiing, kayaking, canoeing, paddleboarding, and fishing are common. The Green Lake Sailing School offers sailing lessons to all age groups during the summer, and there are frequent regattas for different boat classes. The marina in Dartford Bay offers access to town by boat and leads into Deacon Mills Park.

Off of the water, there is an extensive network of bike trails and routes available, including "Loop the Lake," a 24 mile trail which circumnavigates the perimeter of the lake. The Green Lake Conservancy and Green Lake Sanitary district maintain properties that offer public hiking trails at various locations. Green Lake has several golf courses around it, including Tuscumbia Country Club, the oldest course in the state.

The entire lake gradually freezes over during the winter. On the ice, there is ice skating, hockey, ice fishing, snowmobiling, and iceboating. There are frequent iceboat races hosted by the Green Lake Yacht Club.

Off of the ice, there are opportunities for cross-country skiing, snowshoeing, and snowmobiling.[27]

Looking over Green Lake at the city of Green Lake

Green Lake Association[edit]

Founded in 1951, the Green Lake Association (GLA) is a 501 (c)(3) nonprofit, membership organization. Their membership includes nearly 800 households and businesses within the watershed. They promote the conservation of Big Green Lake and its watershed with a singular focus on water quality. [28]

Green Lake Conservancy[edit]

The Green Lake Conservancy is an organization dedicated to preserving the lands surrounding Green Lake. It has worked to establish trails, restore native habitat, and promote a sense of stewardship among young people by providing nature experiences and camps.[29][better source needed]

References[edit]

[30][31]

  1. ^ "Google Earth". Retrieved 2018-08-18.
  2. ^ 2020 Big Green Lake Water Quality Report Showing Averages 1989 - 2020 (Report). Green Lake Sanitary District. 2020.
  3. ^ "Duration of Ice on Big Green Lake (1939/40 - 2005/06 Winter Seasons)". Wisconsin State Climatology Office. 2006. Retrieved October 13, 2020.{{cite web}}: CS1 maint: url-status (link)
  4. ^ a b "Wisconsin's Largest Water Areas" in Wisconsin Legislative Reference Bureau. State of Wisconsin 2005-2006 Blue Book. Madison: Wisconsin Legislature Joint Committee on Legislative Organization, 2005, p. 691.
  5. ^ a b c "Green Lake (Big Green Lake) – Green Lake County, Wisconsin DNR Lake Map Date – Jun 1974 - Historical Lake Map - Not for Navigation" (PDF). Wisconsin Department of Natural Resources. June 1974. Retrieved September 30, 2020.{{cite web}}: CS1 maint: url-status (link)
  6. ^ a b Egbert, Diane (2019). Dartford Days: A Postcard History of Early Green Lake, Wisconsin. New Berlin, Wisconsin: Traxion. pp. 42–57, 190–192, 198–199.
  7. ^ a b c Heiple, Robert W. and Emma B. (1976). A Heritage History of Beautiful Green Lake Wisconsin. Ripon, Wisconsin: Mc Millan Printing Company. pp. 21, 26–28, 38–48.
  8. ^ Lass, William (1962). The Removal From Minnesota of the Sioux and Winnebago Indians. http://collections.mnhs.org/MNHistoryMagazine/articles/38/v38i08p353-364.pdf: University of Nebraska Press. p. 353. {{cite book}}: External link in |location= (help)CS1 maint: location (link)
  9. ^ "The City of Green Lake". Retrieved November 22, 2020.{{cite web}}: CS1 maint: url-status (link)
  10. ^ "Green Lake". Wisconsin Department of Natural Resources.{{cite web}}: CS1 maint: url-status (link)
  11. ^ "Green Lake Watershed Information System". Retrieved November 22, 2020.{{cite web}}: CS1 maint: url-status (link)
  12. ^ a b c "BIG GREEN LAKE TWA WQM PLAN 2017". Wisconsin Department of Natural Resources. 2017.{{cite web}}: CS1 maint: url-status (link)
  13. ^ a b c d e f g h i j k l m Sesing, Mark (2015). "A Lake Management Plan for Green Lake" (PDF). Green Lake Sanitary District.{{cite web}}: CS1 maint: url-status (link)
  14. ^ a b c d e Birge, Edward (1914). The Inland Lakes of Wisconsin. Madison WI: State of Wisconsin.
  15. ^ a b c d e Wetzel, Robert G. (2001). Limnology: Lake and River Ecosystems. Elsevier Science.
  16. ^ This curve is classified as "clinograde," one which varies vertically throughout the water column with temperature. Depletion in oxygen with depth is driven by productivity in the lake. As a mesotrophic lake, biological activity is relatively high in the epilimnion where oxygen can mix in from the atmosphere. Dead organic matter sediments and decays in the hypolimnion, where aerobic respiration depletes the available dissolved oxygen.<ref name="Wetzel2">Wetzel, Robert G. (2001). Limnology: Lake and River Ecosystems. Elsevier Science.
  17. ^ a b Watras, Carl (November 1, 2014). "Microstratification and Oxygen Depletion in Green Lake, Wisconsin: A Pilot Study" (PDF). The Nelson Institute. Retrieved November 21, 2020.{{cite web}}: CS1 maint: url-status (link)
  18. ^ a b Marshall, Dave (December 1, 2015). "Near Shore Fishes of Green Lake" (PDF). The Nelson Institute. Retrieved November 21, 2020.{{cite web}}: CS1 maint: url-status (link)
  19. ^ "Wisconsin's record fish program | Wisconsin DNR". dnr.wisconsin.gov. Retrieved 2020-11-22.
  20. ^ a b Green Lake Aquatic Plant Community Assessment.(PDF) (2015). Brenton Butterfield, Eddie Heath et al., Onterra LLC. p. 9, 12-13, 19
  21. ^ Marshall, Dave (December 1, 2015). "Near Shore Fishes of Green Lake" (PDF). The Nelson Institute. Retrieved November 21, 2020.{{cite web}}: CS1 maint: url-status (link)
  22. ^ Mirr, Chuck (November 17, 2014). "Final Environmental Impact Statement for the Proposed Introduction and Stocking of Landlocked Salmon into Big Green Lake" (PDF). The Nelson Institute. Retrieved November 29, 2020
  23. ^ Portrait and Biographical Album of Green Lake, Marquette and Waushara Counties, Wisconsin ... Acme Publishing Company. 1890.
  24. ^ "Clipped From The Wisconsin Jewish Chronicle". The Wisconsin Jewish Chronicle. 1923-06-01. p. 7. Retrieved 2020-04-05.
  25. ^ "1 Jun 1923, Page 3 - The Wisconsin Jewish Chronicle at Newspapers.com". Newspapers.com. Retrieved 2020-04-05.
  26. ^ "Clipped From Fond Du Lac Commonwealth Reporter". Fond Du Lac Commonwealth Reporter. 1967-08-21. p. 19. Retrieved 2020-04-05.
  27. ^ "Places to Visit in Wisconsin - Things to do in Green Lake, WI". Green Lake Area Chamber of Commerce. Retrieved 2020-11-18.
  28. ^ "Green Lake Association". Green Lake Association. Retrieved 2019-05-07.
  29. ^ Wallenfang, Lindsie (January 2017). "Green Lake Conservancy". Green Lake Magazine. Retrieved December 12, 2017.
  30. ^ "Green Lake, Green Lake County: Water Quality". Wisconsin Department of Natural Resources. 2020. Retrieved October 18, 2020.{{cite web}}: CS1 maint: url-status (link)
  31. ^ "Map of Green Lake, Green Lake Wisconsin". Google Maps. Retrieved September 30, 2020.{{cite web}}: CS1 maint: url-status (link)

External links[edit]

Big Green Lake page from the Wisconsin Department of Natural Resources

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