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| Upper Sioux Observation Well US-O1 | |
|---|---|
| County: | Yellow Medicine |
| Township: | Minnesota Falls (T115N R39W) |
| Location: | On farmsted 1.5 miles east of MN Hwy. 274 |
| Land-surface elevation: | 1032.08 feet, NAVD88 |
| Installation: | Oct. 4, 2006, for the USGS |
| Well information | |
| Depth: | 95 feet |
| Open interval: | 85–95 feet |
| Original and current use: | Monitoring, USGS Hydrologic study |
| Aquifer information | |
| Type: | Hydrologically unconfined buried sands |
| Thickness: | 51 feet (44–95 feet, BLS) |
| Deposit: | Buried, glacially deposited sand |

This site was operated (2007-2020) in cooperation with the Upper
Sioux Community
Water temperature is accurate to plus-or-minus 0.1°C, and 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.