North and South Twin Lakes (Oregon)

Coordinates: 43°43′15″N 121°45′49″W / 43.720746°N 121.763535°W / 43.720746; -121.763535

An aerial view of North Twin Lake (top) and South Twin Lake (bottom)

North and South Twin Lakes are two nearly identical natural lakes in Deschutes County, Oregon. Both were formed around 20,000 years ago when a rising magma reservoir reached groundwater, creating violent steam explosions. Two craters were formed, later filling with water.^[1][2]

North Twin Lake has an elevation of 4,344 feet (1,324 m),^[3] while South Twin Lake is 7 feet (2.1 m) lower, at 4,337 feet (1,322 m).^[4] North is larger, having a surface area of 112 acres (0.45 km²), compared to South's 99 acres (400,000 m²). North is also deeper, with an average depth of 40 feet (12 m), and a maximum depth of 60 feet (18 m).^[1] South is shallower, with an average depth of 33 feet (10 m), and maximum depth of 58 feet (18 m).^[2]

In 1987, the Oregon Department of Fish and Wildlife poisoned South Twin Lake to remove rough fish. The lake is stocked with fingerlings and rainbow trout. North Twin Lake was illegally stocked with catfish some time before 2008. The largest recorded rainbow trout caught from South Twin Lake weighed over 13.5 pounds (6.1 kg). The trout average 10 to 14 inches (25 to 36 cm) long, with 18-inch (46 cm) fish common.^[5]

The Twin Lakes have surprisingly calm winds compared to other Cascade Lakes. South Twin Lake is completely tree-lined except for the beach day-use area. Water levels vary little over the season. The lake is rich with weedbeds.^[5]

References

 This article incorporates public domain material from the United States Forest Service document "South Twin Lake" (retrieved on December 14, 2009).

1. ^ ^{a b} "Oregon Lakes - North Twin Lake". Visit USA.com. http://www.visitusa.com/oregon/lakes/northtwinlake.htm. Retrieved July 12, 2008. 
2. ^ ^{a b} "South Twin Lake". Go-Oregon.net. http://www.go-oregon.net/South-Twin-Lake-Oregon. Retrieved July 12, 2008. 
3. ^ "North Twin Lake". Geographic Names Information System, U.S. Geological Survey. November 28, 1980. http://geonames.usgs.gov/pls/gnispublic/f?p=gnispq:3:::NO::P3_FID:1147069. Retrieved July 12, 2008. 
4. ^ "South Twin Lake". Geographic Names Information System, U.S. Geological Survey. November 28, 1980. http://geonames.usgs.gov/pls/gnispublic/f?p=gnispq:3:::NO::P3_FID:1150087. Retrieved July 12, 2008. 
5. ^ ^{a b} "South Twin Lake". United States Forest Service. http://www.fs.fed.us/r6/centraloregon/recreation/fishing/lake-reservoir/southtwin.shtml. Retrieved December 14, 2009.