Reservoir · North Dakota · United States · BOR RISE
Edward Arthur Patterson Lake
71.9% full
Capacity
10.62 hm³
Volume stored
8 hm³
Coordinates
46.870°N, 102.827°W
Last updated
2026-07-28
Current fill
71.9%vs 7 days ago
-0.1%losing
vs 1 year ago
-10.1%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. 46.870, -102.827 · Open in Google Maps
About Edward Arthur Patterson Lake
As of July 28, 2026, Edward Arthur Patterson Lake is filled to 71.9% of its total capacity, holding roughly 8 hm³ of water out of a maximum 11 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 pts), and it is 10.1 points below its level on the same date a year earlier.
Across the readings we hold for Edward Arthur Patterson Lake — 1823 data points between July 31, 2021 and July 28, 2026 — the level has ranged from a low of 46.2% (October 8, 2021) to a high of 105.0% (April 30, 2022). On average the reservoir is fullest around May and at its lowest around January.
It is operated by BOR primarily for multiple purposes. It lies within the North Dakota basin at 46.870°N, 102.827°W.
Key facts
- Current fill level
- 71.9%
- Water stored
- 8 hm³
- Total capacity
- 11 hm³
- 7-day change
- ▼ 0.1 pts
- Year-on-year
- ▼ 10.1 pts
- Primary use
- Multipurpose
- River basin
- North Dakota
- Operator
- BOR
- Coordinates
- 46.870°N, 102.827°W
- Last updated
- July 28, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 28 Jul 2026 | 71.9% | 8 |
| 27 Jul 2026 | 72.0% | 8 |
| 26 Jul 2026 | 72.3% | 8 |
| 25 Jul 2026 | 72.6% | 8 |
| 24 Jul 2026 | 72.9% | 8 |
| 23 Jul 2026 | 73.2% | 8 |
| 22 Jul 2026 | 73.3% | 8 |
| 21 Jul 2026 | 73.7% | 8 |
| 20 Jul 2026 | 73.8% | 8 |
| 19 Jul 2026 | 74.4% | 8 |
| 18 Jul 2026 | 74.7% | 8 |
| 17 Jul 2026 | 75.0% | 8 |
Frequently asked questions
What is the current water level of Edward Arthur Patterson Lake?
As of July 28, 2026, Edward Arthur Patterson Lake is at 71.9% of its capacity, holding approximately 8 hm³ of water, according to BOR RISE (US Bureau of Reclamation) data.
Is Edward Arthur Patterson Lake reservoir full?
No. As of July 28, 2026, Edward Arthur Patterson Lake is within its normal operating range at 71.9% of its capacity, so it is not full.
Is the water level at Edward Arthur Patterson Lake rising or falling?
The level at Edward Arthur Patterson Lake has been broadly stable over the latest week on record (-0.1 points).
How much water can Edward Arthur Patterson Lake hold?
Edward Arthur Patterson Lake has a total capacity of 11 hm³.
Where is Edward Arthur Patterson Lake reservoir located?
Edward Arthur Patterson Lake is located in North Dakota, United States, within the North Dakota basin (coordinates 46.870°N, 102.827°W).
What is Edward Arthur Patterson Lake used for?
Edward Arthur Patterson Lake is used primarily for multiple purposes, and is managed by BOR.