Reservoir · North Dakota · United States · USACE CWMS
Heart Butte Dam & Reservoir
46.4% full
Capacity
135.47 hm³
Volume stored
63 hm³
Coordinates
46.598°N, 101.810°W
Last updated
2026-07-29
Current fill
46.4%vs 7 days ago
-0.2%losing
vs 1 year ago
-8.2%year-over-year
7-day trend
→stable
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: 2026-07-29.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 46.598, -101.810 · Open in Google Maps
About Heart Butte Dam & Reservoir
As of July 29, 2026, Heart Butte Dam & Reservoir is filled to 46.4% of its total capacity, holding roughly 63 hm³ of water out of a maximum 135 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 (-0.2 pts), and it is 8.2 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 July 31, 2021 and July 29, 2026 — the level has ranged from a low of 39.2% (October 9, 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 lies within the North Dakota basin at 46.598°N, 101.810°W.
Key facts
- Current fill level
- 46.4%
- Water stored
- 63 hm³
- Total capacity
- 135 hm³
- 7-day change
- ▼ 0.2 pts
- Year-on-year
- ▼ 8.2 pts
- Primary use
- Multipurpose
- River basin
- North Dakota
- Operator
- USACE
- Coordinates
- 46.598°N, 101.810°W
- Last updated
- July 29, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 29 Jul 2026 | 46.4% | 63 |
| 28 Jul 2026 | 46.6% | 63 |
| 27 Jul 2026 | 46.8% | 63 |
| 26 Jul 2026 | 47.0% | 64 |
| 25 Jul 2026 | 47.2% | 64 |
| 24 Jul 2026 | 47.4% | 64 |
| 23 Jul 2026 | 47.6% | 64 |
| 22 Jul 2026 | 47.8% | 65 |
| 21 Jul 2026 | 48.0% | 65 |
| 20 Jul 2026 | 48.2% | 65 |
| 19 Jul 2026 | 48.4% | 66 |
| 18 Jul 2026 | 48.6% | 66 |
Frequently asked questions
What is the current water level of Heart Butte Dam & Reservoir?
As of July 29, 2026, Heart Butte Dam & Reservoir is at 46.4% of its capacity, holding approximately 63 hm³ of water, according to USACE CWMS (US Army Corps of Engineers) data.
Is Heart Butte Dam & Reservoir reservoir full?
No. As of July 29, 2026, Heart Butte Dam & Reservoir is within its normal operating range at 46.4% of its capacity, so it is not full.
Is the water level at Heart Butte Dam & Reservoir rising or falling?
The level at Heart Butte Dam & Reservoir has been broadly stable over the latest week on record (-0.2 points).
How much water can Heart Butte Dam & Reservoir hold?
Heart Butte Dam & Reservoir has a total capacity of 135 hm³.
Where is Heart Butte Dam & Reservoir reservoir located?
Heart Butte Dam & Reservoir is located in North Dakota, United States, within the North Dakota basin (coordinates 46.598°N, 101.810°W).
What is Heart Butte Dam & Reservoir used for?
Heart Butte Dam & Reservoir is used primarily for multiple purposes, and is managed by USACE.