Reservoir · South Dakota · United States · BOR RISE
Deerfield Reservoir
Deerfield Reservoir and Dam
82.9% full
Capacity
19.31 hm³
Volume stored
16 hm³
Vs month average
89% of normal
Coordinates
44.028°N, 103.786°W
Last updated
2026-10-27
Current fill
82.9%vs 7 days ago
-1.7 pplosing
vs 1 year ago
-12.9 ppyear-over-year
7-day trend
↓falling
Drought context
Storage vs October average
89%of normal
82.9% full on 2026-10-27, against an average of 93.3% for October across 6 years of readings (-10.4 points).
Drought Monitor at this site · 20 October 2026
D1moderate drought
The ground at Deerfield Reservoir's coordinates falls inside the D1 area of the weekly U.S. Drought Monitor map. That describes local conditions — rainfall, soil moisture, streamflow — not the reservoir's storage. South Dakota drought figures →
Data source: BOR RISE — US Bureau of Reclamation — 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: 2026-10-27.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 44.028°N, 103.786°W · Open in Google Maps
About Deerfield Reservoir
As of October 27, 2026, Deerfield Reservoir is filled to 82.9% of its total capacity, holding 16.01 hm³ of water out of a maximum 19.31 hm³. At this level the reservoir is high.
Over the most recent week on record the fill level has fallen by 1.7 percentage points, and it is 12.9 points below its level on the same date a year earlier.
Across the readings we hold for Deerfield Reservoir — 1951 data points between October 29, 2021 and October 27, 2026 — the level has ranged from a low of 82.9% (October 27, 2026) to a high of 101.8% (July 1, 2023). On average the reservoir is fullest around June and at its lowest around October.
It is operated by BOR primarily for multiple purposes. It is at 44.028°N, 103.786°W.
Key facts
- Current fill level
- 82.9% of total capacity
- Water stored
- 16.01 hm³
- Total capacity
- 19.31 hm³
- 7-day change
- ▼ 1.7 pp
- Year-on-year
- ▼ 12.9 pp
- Primary use
- Multipurpose
- Operator
- BOR
- Coordinates
- 44.028°N, 103.786°W
- Last updated
- October 27, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 27 Oct 2026 | 82.9% | 16.01 |
| 26 Oct 2026 | 83.2% | 16.06 |
| 25 Oct 2026 | 83.4% | 16.1 |
| 24 Oct 2026 | 83.6% | 16.14 |
| 23 Oct 2026 | 83.9% | 16.2 |
| 22 Oct 2026 | 84.1% | 16.24 |
| 21 Oct 2026 | 84.4% | 16.29 |
| 20 Oct 2026 | 84.6% | 16.33 |
| 19 Oct 2026 | 84.8% | 16.38 |
| 18 Oct 2026 | 85.0% | 16.42 |
| 17 Oct 2026 | 85.3% | 16.48 |
| 16 Oct 2026 | 85.6% | 16.52 |