Reservoir · South Dakota · United States · USACE CWMS
Shadehill Dam & Reservoir
66.1% full
Capacity
172.29 hm³
Volume stored
114 hm³
Coordinates
45.753°N, 102.203°W
Last updated
2026-09-10
Current fill
66.1%vs 7 days ago
-0.6%losing
vs 1 year ago
-6.6%year-over-year
7-day trend
→stable
Data source: USACE CWMS — US Army Corps of Engineers — daily reservoir storage volume. Capacity is the design (normal full-pool) capacity from the US National Inventory of Dams (NID); fill % = current volume ÷ design capacity. Last reading: 2026-09-10.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 45.753, -102.203 · Open in Google Maps
About Shadehill Dam & Reservoir
As of September 10, 2026, Shadehill Dam & Reservoir is filled to 66.1% of its total capacity, holding roughly 114 hm³ of water out of a maximum 172 hm³. At this level the reservoir is within its normal operating range.
Over the most recent week on record the fill level has held broadly steady (-0.6 pts), and it is 6.6 points below its level on the same date a year earlier.
Across the readings we hold for Shadehill Dam & Reservoir — 1819 data points between September 12, 2021 and September 10, 2026 — the level has ranged from a low of 51.0% (February 22, 2022) to a high of 85.6% (July 27, 2023). On average the reservoir is fullest around June and at its lowest around February.
It is operated by USACE primarily for multiple purposes. It lies within the South Dakota basin at 45.753°N, 102.203°W.
Key facts
- Current fill level
- 66.1%
- Water stored
- 114 hm³
- Total capacity
- 172 hm³
- 7-day change
- ▼ 0.6 pts
- Year-on-year
- ▼ 6.6 pts
- Primary use
- Multipurpose
- River basin
- South Dakota
- Operator
- USACE
- Coordinates
- 45.753°N, 102.203°W
- Last updated
- September 10, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 10 Sep 2026 | 66.1% | 114 |
| 9 Sep 2026 | 66.2% | 114 |
| 8 Sep 2026 | 66.4% | 114 |
| 7 Sep 2026 | 66.5% | 114 |
| 6 Sep 2026 | 66.5% | 115 |
| 5 Sep 2026 | 66.6% | 115 |
| 4 Sep 2026 | 66.7% | 115 |
| 3 Sep 2026 | 66.7% | 115 |
| 2 Sep 2026 | 66.8% | 115 |
| 1 Sep 2026 | 66.9% | 115 |
| 31 Aug 2026 | 67.0% | 115 |
| 30 Aug 2026 | 67.0% | 115 |