Reservoir · Montana · United States · BOR RISE
Lake Como and Como Dam (CMO)
101.2% full
Capacity
47.48 hm³
Volume stored
48 hm³
Coordinates
46.062°N, 114.233°W
Last updated
2026-06-11
Current fill
101.2%vs 7 days ago
0.0%stable
vs 1 year ago
+23.1%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: 2026-06-11.
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 (CMO)
As of June 11, 2026, Lake Como and Como Dam (CMO) is filled to 101.2% of its total capacity, holding roughly 48 hm³ of water out of a maximum 47 hm³. At this level the reservoir is effectively full.
Over the most recent week on record the fill level has held broadly steady (+0.0 pts), and it is 23.1 points above its level on the same date a year earlier.
Across the readings we hold for Lake Como and Como Dam (CMO) — 2191 data points between June 13, 2021 and June 11, 2026 — the level has ranged from a low of 9.2% (October 14, 2021) to a high of 102.3% (June 16, 2021). 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
- 101.2%
- Water stored
- 48 hm³
- Total capacity
- 47 hm³
- 7-day change
- No change
- Year-on-year
- ▲ 23.1 pts
- Primary use
- Multipurpose
- River basin
- Montana
- Operator
- BOR
- Coordinates
- 46.062°N, 114.233°W
- Last updated
- June 11, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 11 Jun 2026 | 101.2% | 48 |
| 10 Jun 2026 | 101.2% | 48 |
| 9 Jun 2026 | 101.1% | 48 |
| 8 Jun 2026 | 100.8% | 48 |
| 7 Jun 2026 | 101.0% | 48 |
| 6 Jun 2026 | 101.5% | 48 |
| 5 Jun 2026 | 101.6% | 48 |
| 4 Jun 2026 | 101.6% | 48 |
| 3 Jun 2026 | 101.3% | 48 |
| 2 Jun 2026 | 101.1% | 48 |
| 1 Jun 2026 | 100.6% | 48 |
| 31 May 2026 | 101.2% | 48 |
Frequently asked questions
What is the current water level of Lake Como and Como Dam (CMO)?
As of June 11, 2026, Lake Como and Como Dam (CMO) is at 101.2% of its capacity, holding approximately 48 hm³ of water, according to BOR RISE (US Bureau of Reclamation) data.
Is Lake Como and Como Dam (CMO) reservoir full?
Lake Como and Como Dam (CMO) is essentially full, sitting at 101.2% of capacity as of June 11, 2026.
Is the water level at Lake Como and Como Dam (CMO) rising or falling?
The level at Lake Como and Como Dam (CMO) has been broadly stable over the latest week on record (0.0 points).
How much water can Lake Como and Como Dam (CMO) hold?
Lake Como and Como Dam (CMO) has a total capacity of 47 hm³.
Where is Lake Como and Como Dam (CMO) reservoir located?
Lake Como and Como Dam (CMO) is located in Montana, United States, within the Montana basin (coordinates 46.062°N, 114.233°W).
What is Lake Como and Como Dam (CMO) used for?
Lake Como and Como Dam (CMO) is used primarily for multiple purposes, and is managed by BOR.