Question: The Conklingville Dam holds back what lake with a surface area of about 41.7 squmi at capacity?

Context paragraphs:
Stausee Solis: The Stausee Solis ("Solis reservoir") is a reservoir on the Albula river, located between Alvaschein, Stierva and Tiefencastel, in the canton of Graubünden.  Its surface area is 17.75 ha .  Was built in 1986 by the Electric Power Company of Zurich (ewz).  Until 2012 about 50% of the reservoir volume of 4.1 e6m3 got lost due to sediment aggregation.  A dam of 61 m height and a crown length of 75 m holds back the water in the lake.  The water in the reservoir is used for energy production further downstream, in the power plants Sils and Rothenbrunnen.  This dam is used as daily storage.

Wingecarribee Dam: Wingecarribee Dam, completed in 1974 as part of the Shoalhaven Scheme, is an earth and rockfill embankment dam structure located on the Wingecarribee River about 15 km southeast of Bowral in New South Wales, Australia.  The embankment of 573 m3 is 19 m high and 1140 m in length.  At 100% capacity, the dam wall holds back approximately 25875 ML and creates the impounded reservoir of Wingecarribee Reservoir that has a surface area of 625 ha , drawn from a catchment area of 40 km2 .  The spillway has a discharge capacity of 520 m3/s .  Wingecarribee Reservoir lost around 9000 ML of storage capacity as a result of the inflow of peat from the Wingecarribee Swamp collapse in August 1998.  The original storage capacity was 34500 ML .

Tallowa Dam: Tallowa Dam, completed in 1976, is a concrete gravity dam with central overflow spillway, located of the Shoalhaven River, downstream from the river's confluence with the Kangaroo River.  The dam wall of 325 m3 is 43 m high and 528 m in length.  At 100% capacity, the dam wall holds back approximately 85500 ML and creates the impounded reservoir of Lake Yarrunga that has a surface area of 831 ha , drawn from a catchment area of 5750 km2 .  The spillway has a discharge capacity of 27600 m3/s .

Great Sacandaga Lake: The Great Sacandaga Lake (formerly the Sacandaga Reservoir) is a large lake situated in the Adirondack Park in northern New York in the United States.  The lake has a surface area of about 41.7 sqmi at capacity, and the length is about 29 mi .  The word "Sacandaga" means "Land of the Waving Grass" in the local native language.  The lake is located in the northern parts of Fulton County and Saratoga County near the south border of the Adirondack Park.  A small part of it also extends northward into southern Hamilton County.  The broader, south end of the lake is northeast of the City of Johnstown and the City of Gloversville.

Stewart's Dam: Stewart’s Dam, in Hadley, New York, on the Sacandaga River, holds back the Stewart Bridge Reservoir, one of the largest reservoirs in America to be contained by an earthen dam.  Farther upstream is the Conklingville Dam which creates the Great Sacandaga Lake.

Callide Dam: The Callide Dam was constructed in 1965 to supply water for a nearby power station in Biloela in the state of Queensland, Australia.  Callide Dam holds 136300 ML at an average depth of 10.5 m and a surface area of 1240 ha at full capacity.

Dry dam: A dry dam is a dam constructed for the purpose of flood control.  Dry dams typically contain no gates or turbines, and are intended to allow the channel to flow freely during normal conditions.  During periods of intense rainfall that would otherwise cause floods, the dam holds back the excess water, releasing it downstream at a controlled rate.

Conklingville Dam: The Conklingville Dam, in Hadley, Saratoga County, New York, is an earthen dam which holds back the Great Sacandaga Lake (in the town of Day, New York).

Fitzroy Falls Dam: Fitzroy Falls Dam in New South Wales, Australia, is part of the Shoalhaven Scheme, completed in 1974.  It consists of four separate earth and rockfill embankments located on the Yarrunga Creek upstream of Fitzroy Falls and about 16 km southeast of Moss Vale.  The main embankment of 760 m3 is 14 m high and 1530 m in length.  At 100% capacity, the dam wall holds back approximately 9950 ML of water, creating the impounded Fitzroy Falls Reservoir, which has a surface area of 522 ha , drawn from a catchment area of 31 km2 .  The spillway has a discharge capacity of 516 m3/s .

Sameura Dam: The Sameura Dam (早明浦ダム "Sameura-damu") is a dam on the Yoshino River on the island of Shikoku, Japan, completed in 1975.  It has the largest storage capacity in Shikoku.  The dam holds back a reservoir, named Lake Sameura (さめうら湖 "Sameura-ko")

Supporting paragraphs: Conklingville Dam Great Sacandaga Lake
Answer: Great Sacandaga Lake