Reservoir · South Dakota · United States · USACE CWMS
Belle Fourche Reservoir
32.3% full
Capacity
236.92 hm³
Volume stored
77 hm³
Vs month average
62% of normal
Coordinates
44.737°N, 103.674°W
Last updated
2026-10-27
Current fill
32.3%vs 7 days ago
+0.7 ppgaining
vs 1 year ago
-33.6 ppyear-over-year
7-day trend
→stable
Drought context
Storage vs October average
62%of normal
32.3% full on 2026-10-27, against an average of 52.2% for October across 6 years of readings (-19.9 points).
Drought Monitor at this site · 20 October 2026
D1moderate drought
The ground at Belle Fourche 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: 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: 2026-10-27.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 44.737°N, 103.674°W · Open in Google Maps
About Belle Fourche Reservoir
As of October 27, 2026, Belle Fourche Reservoir is filled to 32.3% of its total capacity, holding 76.51 hm³ of water out of a maximum 236.92 hm³. At this level the reservoir is low.
Over the most recent week on record the fill level has held broadly steady (+0.7 pp), and it is 33.6 points below its level on the same date a year earlier.
Across the readings we hold for Belle Fourche Reservoir — 1804 data points between October 29, 2021 and October 27, 2026 — the level has ranged from a low of 27.7% (September 14, 2026) to a high of 89.0% (June 25, 2023). On average the reservoir is fullest around May and at its lowest around September.
It is operated by USACE primarily for multiple purposes. It is at 44.737°N, 103.674°W.
Key facts
- Current fill level
- 32.3% of total capacity
- Water stored
- 76.51 hm³
- Total capacity
- 236.92 hm³
- 7-day change
- ▲ 0.7 pp
- Year-on-year
- ▼ 33.6 pp
- Primary use
- Multipurpose
- Operator
- USACE
- Coordinates
- 44.737°N, 103.674°W
- Last updated
- October 27, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 27 Oct 2026 | 32.3% | 76.51 |
| 26 Oct 2026 | 32.2% | 76.23 |
| 25 Oct 2026 | 32.1% | 76.01 |
| 24 Oct 2026 | 32.0% | 75.9 |
| 23 Oct 2026 | 31.9% | 75.68 |
| 22 Oct 2026 | 31.7% | 75.19 |
| 21 Oct 2026 | 31.6% | 74.86 |
| 20 Oct 2026 | 31.6% | 74.75 |
| 19 Oct 2026 | 31.4% | 74.37 |
| 18 Oct 2026 | 31.3% | 74.15 |
| 17 Oct 2026 | 31.2% | 73.83 |
| 16 Oct 2026 | 30.7% | 72.7 |