Reservoir · Montana · United States · BOR RISE
Lake Como and Como Dam
60.2% full
Capacity
47.48 hm³
Volume stored
29 hm³
Coordinates
46.062°N, 114.233°W
Last updated
2026-08-12
Current fill
60.2%vs 7 days ago
-10.7%losing
vs 1 year ago
+18.5%year-over-year
7-day trend
↓falling
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: 2026-08-12.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 46.062, -114.233 · Open in Google Maps
About Lake Como and Como Dam
As of August 12, 2026, Lake Como and Como Dam is filled to 60.2% of its total capacity, holding roughly 29 hm³ of water out of a maximum 47 hm³. At this level the reservoir is within its normal operating range.
Over the most recent week on record the fill level has fallen by 10.7 percentage points, and it is 18.5 points above its level on the same date a year earlier.
Across the readings we hold for Lake Como and Como Dam — 2185 data points between August 15, 2021 and August 12, 2026 — the level has ranged from a low of 9.2% (October 14, 2021) to a high of 102.3% (June 29, 2022). On average the reservoir is fullest around June and at its lowest around October.
It is operated by BOR primarily for multiple purposes. It lies within the Montana basin at 46.062°N, 114.233°W.
Key facts
- Current fill level
- 60.2%
- Water stored
- 29 hm³
- Total capacity
- 47 hm³
- 7-day change
- ▼ 10.7 pts
- Year-on-year
- ▲ 18.5 pts
- Primary use
- Multipurpose
- River basin
- Montana
- Operator
- BOR
- Coordinates
- 46.062°N, 114.233°W
- Last updated
- August 12, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 12 Aug 2026 | 60.2% | 29 |
| 11 Aug 2026 | 61.7% | 29 |
| 10 Aug 2026 | 63.3% | 30 |
| 9 Aug 2026 | 64.8% | 31 |
| 8 Aug 2026 | 66.3% | 31 |
| 6 Aug 2026 | 69.4% | 33 |
| 5 Aug 2026 | 70.9% | 34 |
| 4 Aug 2026 | 72.4% | 34 |
| 3 Aug 2026 | 73.9% | 35 |
| 2 Aug 2026 | 75.5% | 36 |
| 30 Jul 2026 | 80.1% | 38 |
| 29 Jul 2026 | 81.6% | 39 |
Frequently asked questions
What is the current water level of Lake Como and Como Dam?
As of August 12, 2026, Lake Como and Como Dam is at 60.2% of its capacity, holding approximately 29 hm³ of water, according to BOR RISE (US Bureau of Reclamation) data.
Is Lake Como and Como Dam reservoir full?
No. As of August 12, 2026, Lake Como and Como Dam is within its normal operating range at 60.2% of its capacity, so it is not full.
Is the water level at Lake Como and Como Dam rising or falling?
The level at Lake Como and Como Dam is falling — it dropped 10.7 percentage points over the latest week on record.
How much water can Lake Como and Como Dam hold?
Lake Como and Como Dam has a total capacity of 47 hm³.
Where is Lake Como and Como Dam reservoir located?
Lake Como and Como Dam is located in Montana, United States, within the Montana basin (coordinates 46.062°N, 114.233°W).
What is Lake Como and Como Dam used for?
Lake Como and Como Dam is used primarily for multiple purposes, and is managed by BOR.