| Lake Alvin | |
| Coords: | 43.4408°N -96.6111°W |
| Inflow: | Nine Mile Creek |
| Outflow: | Nine Mile Creek |
| Basin Countries: | United States |
| Pushpin Map: | South Dakota#USA |
| Pushpin Map Alt: | Location of Lake Alvin in South Dakota, USA. |
Lake Alvin is an artificial lake in Lincoln County, South Dakota between Harrisburg, South Dakota and Granite, Iowa. The lake is formed by a dam on Nine Mile Creek just before it enters the Big Sioux River, east of Harrisburg. It is part of a 59acres recreational area.[1]
Lake Alvin has always been a popular swimming location for those looking for a mid-sized beach. However, in 2005, the South Dakota GFP closed the swimming beach to the public due to high levels of coliform bacteria in the lake. A shutdown was again issued in 2009, 2013, 2014, and 2020 due to high levels of coliform bacteria.