Reservoir · South Dakota · United States · BOR RISE
Deerfield Reservoir and Dam
92.1% full
Capacity
19.31 hm³
Volume stored
18 hm³
Coordinates
44.028°N, 103.786°W
Last updated
2026-07-28
Current fill
92.1%vs 7 days ago
0.0%stable
vs 1 year ago
-2.6%year-over-year
7-day trend
→stable
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: 2026-07-28.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 44.028, -103.786 · Open in Google Maps
About Deerfield Reservoir and Dam
As of July 28, 2026, Deerfield Reservoir and Dam is filled to 92.1% of its total capacity, holding roughly 18 hm³ of water out of a maximum 19 hm³. At this level the reservoir is high.
Over the most recent week on record the fill level has held broadly steady (+0.0 pts), and it is 2.6 points below its level on the same date a year earlier.
Across the readings we hold for Deerfield Reservoir and Dam — 1823 data points between July 31, 2021 and July 28, 2026 — the level has ranged from a low of 89.3% (November 23, 2024) 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 lies within the South Dakota basin at 44.028°N, 103.786°W.
Key facts
- Current fill level
- 92.1%
- Water stored
- 18 hm³
- Total capacity
- 19 hm³
- 7-day change
- No change
- Year-on-year
- ▼ 2.6 pts
- Primary use
- Multipurpose
- River basin
- South Dakota
- Operator
- BOR
- Coordinates
- 44.028°N, 103.786°W
- Last updated
- July 28, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 28 Jul 2026 | 92.1% | 18 |
| 27 Jul 2026 | 92.1% | 18 |
| 26 Jul 2026 | 92.2% | 18 |
| 25 Jul 2026 | 92.2% | 18 |
| 24 Jul 2026 | 92.2% | 18 |
| 23 Jul 2026 | 92.3% | 18 |
| 22 Jul 2026 | 92.1% | 18 |
| 21 Jul 2026 | 92.2% | 18 |
| 20 Jul 2026 | 92.3% | 18 |
| 19 Jul 2026 | 92.3% | 18 |
| 18 Jul 2026 | 92.4% | 18 |
| 17 Jul 2026 | 92.4% | 18 |
Frequently asked questions
What is the current water level of Deerfield Reservoir and Dam?
As of July 28, 2026, Deerfield Reservoir and Dam is at 92.1% of its capacity, holding approximately 18 hm³ of water, according to BOR RISE (US Bureau of Reclamation) data.
Is Deerfield Reservoir and Dam reservoir full?
No. As of July 28, 2026, Deerfield Reservoir and Dam is high at 92.1% of its capacity, so it is not full.
Is the water level at Deerfield Reservoir and Dam rising or falling?
The level at Deerfield Reservoir and Dam has been broadly stable over the latest week on record (0.0 points).
How much water can Deerfield Reservoir and Dam hold?
Deerfield Reservoir and Dam has a total capacity of 19 hm³.
Where is Deerfield Reservoir and Dam reservoir located?
Deerfield Reservoir and Dam is located in South Dakota, United States, within the South Dakota basin (coordinates 44.028°N, 103.786°W).
What is Deerfield Reservoir and Dam used for?
Deerfield Reservoir and Dam is used primarily for multiple purposes, and is managed by BOR.