Reservoir · South Dakota · United States · BOR RISE
Belle Fourche Reservoir and Dam
51.0% full
Capacity
236.92 hm³
Volume stored
121 hm³
Coordinates
44.737°N, 103.674°W
Last updated
2026-07-28
Current fill
51.0%vs 7 days ago
-0.5%losing
vs 1 year ago
-23.1%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. 44.737, -103.674 · Open in Google Maps
About Belle Fourche Reservoir and Dam
As of July 28, 2026, Belle Fourche Reservoir and Dam 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 23.1 points below its level on the same date a year earlier.
Across the readings we hold for Belle Fourche Reservoir and Dam — 1823 data points between July 31, 2021 and July 28, 2026 — the level has ranged from a low of 35.2% (September 20, 2021) to a high of 89.0% (June 24, 2023). On average the reservoir is fullest around May and at its lowest around September.
It is operated by BOR 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
- ▼ 23.1 pts
- Primary use
- Multipurpose
- River basin
- South Dakota
- Operator
- BOR
- Coordinates
- 44.737°N, 103.674°W
- Last updated
- July 28, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 28 Jul 2026 | 51.0% | 121 |
| 27 Jul 2026 | 51.5% | 122 |
| 26 Jul 2026 | 51.9% | 123 |
| 25 Jul 2026 | 52.3% | 124 |
| 24 Jul 2026 | 53.1% | 126 |
| 23 Jul 2026 | 53.7% | 127 |
| 22 Jul 2026 | 54.2% | 128 |
| 21 Jul 2026 | 55.0% | 130 |
| 20 Jul 2026 | 55.8% | 132 |
| 19 Jul 2026 | 56.5% | 134 |
| 18 Jul 2026 | 56.8% | 135 |
| 17 Jul 2026 | 57.7% | 137 |
Frequently asked questions
What is the current water level of Belle Fourche Reservoir and Dam?
As of July 28, 2026, Belle Fourche Reservoir and Dam is at 51.0% of its capacity, holding approximately 121 hm³ of water, according to BOR RISE (US Bureau of Reclamation) data.
Is Belle Fourche Reservoir and Dam reservoir full?
No. As of July 28, 2026, Belle Fourche Reservoir and Dam 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 and Dam rising or falling?
The level at Belle Fourche Reservoir and Dam has been broadly stable over the latest week on record (-0.5 points).
How much water can Belle Fourche Reservoir and Dam hold?
Belle Fourche Reservoir and Dam has a total capacity of 237 hm³.
Where is Belle Fourche Reservoir and Dam reservoir located?
Belle Fourche Reservoir and Dam is located in South Dakota, United States, within the South Dakota basin (coordinates 44.737°N, 103.674°W).
What is Belle Fourche Reservoir and Dam used for?
Belle Fourche Reservoir and Dam is used primarily for multiple purposes, and is managed by BOR.