Reservoir · Minnesota · United States · USACE CWMS
Big Sandy Lake Dam
55.4% full
Capacity
136.28 hm³
Volume stored
76 hm³
Coordinates
46.788°N, 93.328°W
Last updated
2026-07-30
Current fill
55.4%vs 7 days ago
-0.1%losing
vs 1 year ago
-1.9%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: 2026-07-30.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 46.788, -93.328 · Open in Google Maps
About Big Sandy Lake Dam
As of July 30, 2026, Big Sandy Lake Dam is filled to 55.4% of its total capacity, holding roughly 76 hm³ of water out of a maximum 136 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 1.9 points below its level on the same date a year earlier.
Across the readings we hold for Big Sandy Lake Dam — 1369 data points between September 15, 2021 and July 30, 2026 — the level has ranged from a low of 38.8% (April 8, 2023) to a high of 100.0% (April 28, 2023). On average the reservoir is fullest around May and at its lowest around March.
It is operated by USACE primarily for multiple purposes. It lies within the Minnesota basin at 46.788°N, 93.328°W.
Key facts
- Current fill level
- 55.4%
- Water stored
- 76 hm³
- Total capacity
- 136 hm³
- 7-day change
- ▼ 0.1 pts
- Year-on-year
- ▼ 1.9 pts
- Primary use
- Multipurpose
- River basin
- Minnesota
- Operator
- USACE
- Coordinates
- 46.788°N, 93.328°W
- Last updated
- July 30, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 30 Jul 2026 | 55.4% | 76 |
| 29 Jul 2026 | 55.5% | 76 |
| 28 Jul 2026 | 55.5% | 76 |
| 27 Jul 2026 | 55.5% | 76 |
| 26 Jul 2026 | 55.6% | 76 |
| 25 Jul 2026 | 55.6% | 76 |
| 24 Jul 2026 | 55.8% | 76 |
| 23 Jul 2026 | 55.8% | 76 |
| 22 Jul 2026 | 55.8% | 76 |
| 21 Jul 2026 | 55.7% | 76 |
| 20 Jul 2026 | 55.9% | 76 |
| 19 Jul 2026 | 56.3% | 77 |
Frequently asked questions
What is the current water level of Big Sandy Lake Dam?
As of July 30, 2026, Big Sandy Lake Dam is at 55.4% of its capacity, holding approximately 76 hm³ of water, according to USACE CWMS (US Army Corps of Engineers) data.
Is Big Sandy Lake Dam reservoir full?
No. As of July 30, 2026, Big Sandy Lake Dam is within its normal operating range at 55.4% of its capacity, so it is not full.
Is the water level at Big Sandy Lake Dam rising or falling?
The level at Big Sandy Lake Dam has been broadly stable over the latest week on record (-0.1 points).
How much water can Big Sandy Lake Dam hold?
Big Sandy Lake Dam has a total capacity of 136 hm³.
Where is Big Sandy Lake Dam reservoir located?
Big Sandy Lake Dam is located in Minnesota, United States, within the Minnesota basin (coordinates 46.788°N, 93.328°W).
What is Big Sandy Lake Dam used for?
Big Sandy Lake Dam is used primarily for multiple purposes, and is managed by USACE.