This site was operated (2005-2020) in cooperation with the Upper Sioux Community

This well was periodically pumped by Upper Sioux Community during 20 Jul. 2005 to 06 April 2017. The pump was permanently removed from this production well on 07 April 2017.

Water temperature is accurate to ±0.1°C during 02 May 2017 to 02 November 2020 at 10:00 CST, and differences in temperature are accurate to 0.1°C. Water temperature is accurate to ±1.0°C during 20 July 2005 to 01 May 2017, but differences in temperature are accurate to 0.1°C.

Water levels below land surface are accurate to 0.01 feet. Water levels above National American Vertical Datum of 1988 (sea level) are calculated by subtracting recorded water levels from the land surface elevation, which is accurate to ± 0.01 feet based on a differential GPS survey. Water-level differences are accurate to within 0.01 feet.

Precipitation is accurate to 0.01 inches except during freezing periods (about Dec. through early Apr.). The rain gage is unheated and uncovered. The precipitation data during freezing periods result from melting of snow (accumulated in the rain gage) during warm periods and do NOT represent actual precipitation. Precipitation totals during freezing periods may underestimate actual totals because the rain gage funnel may be full of snow (preventing further accumulation) or because snow in the funnel may sublimate instead of melt.