Reservoir · South Dakota · United States · USACE CWMS
Belle Fourche Reservoir, SD
51.0% full
Capacity
236.92 hm³
Volume stored
121 hm³
Coordinates
44.737°N, 103.674°W
Last updated
2026-07-29
Current fill
51.0%vs 7 days ago
-0.5%losing
vs 1 year ago
-23.2%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: 2026-07-29.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 44.737, -103.674 · Open in Google Maps
About Belle Fourche Reservoir, SD
As of July 29, 2026, Belle Fourche Reservoir, SD is filled to 51.0% of its total capacity, holding roughly 121 hm³ of water out of a maximum 237 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 (-0.5 pts), and it is 23.2 points below its level on the same date a year earlier.
Across the readings we hold for Belle Fourche Reservoir, SD — 1804 data points between July 31, 2021 and July 29, 2026 — the level has ranged from a low of 35.2% (September 21, 2021) to a high of 89.0% (June 25, 2023). On average the reservoir is fullest around May and at its lowest around October.
It is operated by USACE primarily for multiple purposes. It lies within the South Dakota basin at 44.737°N, 103.674°W.
Key facts
- Current fill level
- 51.0%
- Water stored
- 121 hm³
- Total capacity
- 237 hm³
- 7-day change
- ▼ 0.5 pts
- Year-on-year
- ▼ 23.2 pts
- Primary use
- Multipurpose
- River basin
- South Dakota
- Operator
- USACE
- Coordinates
- 44.737°N, 103.674°W
- Last updated
- July 29, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 29 Jul 2026 | 51.0% | 121 |
| 28 Jul 2026 | 51.5% | 122 |
| 27 Jul 2026 | 51.9% | 123 |
| 26 Jul 2026 | 52.3% | 124 |
| 25 Jul 2026 | 53.1% | 126 |
| 24 Jul 2026 | 53.7% | 127 |
| 23 Jul 2026 | 54.2% | 128 |
| 22 Jul 2026 | 55.0% | 130 |
| 21 Jul 2026 | 55.8% | 132 |
| 20 Jul 2026 | 56.5% | 134 |
| 19 Jul 2026 | 56.8% | 135 |
| 18 Jul 2026 | 57.7% | 137 |
Frequently asked questions
What is the current water level of Belle Fourche Reservoir, SD?
As of July 29, 2026, Belle Fourche Reservoir, SD is at 51.0% of its capacity, holding approximately 121 hm³ of water, according to USACE CWMS (US Army Corps of Engineers) data.
Is Belle Fourche Reservoir, SD reservoir full?
No. As of July 29, 2026, Belle Fourche Reservoir, SD is within its normal operating range at 51.0% of its capacity, so it is not full.
Is the water level at Belle Fourche Reservoir, SD rising or falling?
The level at Belle Fourche Reservoir, SD has been broadly stable over the latest week on record (-0.5 points).
How much water can Belle Fourche Reservoir, SD hold?
Belle Fourche Reservoir, SD has a total capacity of 237 hm³.
Where is Belle Fourche Reservoir, SD reservoir located?
Belle Fourche Reservoir, SD is located in South Dakota, United States, within the South Dakota basin (coordinates 44.737°N, 103.674°W).
What is Belle Fourche Reservoir, SD used for?
Belle Fourche Reservoir, SD is used primarily for multiple purposes, and is managed by USACE.