Reservoir · North Dakota · United States · USACE CWMS
Garrison Dam & Reservoir
75.2% full
Capacity
22,819.42 hm³
Volume stored
17157 hm³
Vs month average
83% of normal
Coordinates
47.505°N, 101.432°W
Last updated
2026-10-27
Current fill
75.2%vs 7 days ago
-0.1 pplosing
vs 1 year ago
-11.1 ppyear-over-year
7-day trend
→stable
Drought context
Storage vs October average
83%of normal
75.2% full on 2026-10-27, against an average of 90.1% for October across 6 years of readings (-14.9 points).
Drought Monitor at this site · 20 October 2026
D1moderate drought
The ground at Garrison 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. 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. 47.505°N, 101.432°W · Open in Google Maps
About Garrison Dam & Reservoir
As of October 27, 2026, Garrison Dam & Reservoir is filled to 75.2% of its total capacity, holding 17,157 hm³ of water out of a maximum 22,819 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 11.1 points below its level on the same date a year earlier.
Across the readings we hold for Garrison Dam & Reservoir — 1792 data points between October 29, 2021 and October 27, 2026 — the level has ranged from a low of 75.2% (October 27, 2026) to a high of 105.0% (July 24, 2023). On average the reservoir is fullest around July and at its lowest around March.
It is operated by USACE primarily for multiple purposes. It is at 47.505°N, 101.432°W.
Key facts
- Current fill level
- 75.2% of total capacity
- Water stored
- 17,157 hm³
- Total capacity
- 22,819 hm³
- 7-day change
- ▼ 0.1 pp
- Year-on-year
- ▼ 11.1 pp
- Primary use
- Multipurpose
- Operator
- USACE
- Coordinates
- 47.505°N, 101.432°W
- Last updated
- October 27, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 27 Oct 2026 | 75.2% | 17,157 |
| 26 Oct 2026 | 75.3% | 17,173 |
| 25 Oct 2026 | 75.3% | 17,177 |
| 24 Oct 2026 | 75.3% | 17,179 |
| 23 Oct 2026 | 75.3% | 17,179 |
| 22 Oct 2026 | 75.3% | 17,179 |
| 21 Oct 2026 | 75.3% | 17,182 |
| 20 Oct 2026 | 75.3% | 17,184 |
| 19 Oct 2026 | 75.3% | 17,190 |
| 18 Oct 2026 | 75.4% | 17,195 |
| 17 Oct 2026 | 75.4% | 17,198 |
| 16 Oct 2026 | 75.4% | 17,202 |