Reservoir · North Dakota · United States · USACE CWMS
Heart Butte Dam & Reservoir
41.5% full
Capacity
135.47 hm³
Volume stored
56 hm³
Vs month average
85% of normal
Coordinates
46.598°N, 101.810°W
Last updated
2026-10-27
Current fill
41.5%vs 7 days ago
+0.1 ppgaining
vs 1 year ago
-9.9 ppyear-over-year
7-day trend
→stable
Drought context
Storage vs October average
85%of normal
41.5% full on 2026-10-27, against an average of 48.6% for October across 6 years of readings (-7.1 points).
Drought Monitor at this site · 20 October 2026
D1moderate drought
The ground at Heart Butte Dam & 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. North Dakota drought figures →
Data source: USACE CWMS — US Army Corps of Engineers — daily reservoir storage volume. Design capacity is unavailable for this site, so fill % is estimated against the 5-year maximum storage and may overstate fullness. 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. 46.598°N, 101.810°W · Open in Google Maps
About Heart Butte Dam & Reservoir
As of October 27, 2026, Heart Butte Dam & Reservoir is filled to 41.5% of its total capacity, holding 56.21 hm³ of water out of a maximum 135.47 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 (+0.1 pp), and it is 9.9 points below its level on the same date a year earlier.
Across the readings we hold for Heart Butte Dam & Reservoir — 1821 data points between October 29, 2021 and October 27, 2026 — the level has ranged from a low of 39.9% (November 26, 2021) to a high of 100.0% (April 16, 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 is at 46.598°N, 101.810°W.
Key facts
- Current fill level
- 41.5% of total capacity
- Water stored
- 56.21 hm³
- Total capacity
- 135.47 hm³
- 7-day change
- ▲ 0.1 pp
- Year-on-year
- ▼ 9.9 pp
- Primary use
- Multipurpose
- Operator
- USACE
- Coordinates
- 46.598°N, 101.810°W
- Last updated
- October 27, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 27 Oct 2026 | 41.5% | 56.21 |
| 26 Oct 2026 | 41.5% | 56.17 |
| 25 Oct 2026 | 41.5% | 56.24 |
| 24 Oct 2026 | 41.7% | 56.49 |
| 23 Oct 2026 | 41.5% | 56.21 |
| 22 Oct 2026 | 41.5% | 56.21 |
| 21 Oct 2026 | 41.5% | 56.21 |
| 20 Oct 2026 | 41.4% | 56.14 |
| 19 Oct 2026 | 41.5% | 56.17 |
| 18 Oct 2026 | 41.5% | 56.21 |
| 17 Oct 2026 | 41.5% | 56.17 |
| 16 Oct 2026 | 41.5% | 56.27 |