Reservoir · Colorado · United States · BOR RISE
Lake Granby and Dam
62.9% full
Capacity
665.78 hm³
Volume stored
419 hm³
Coordinates
40.182°N, 105.871°W
Last updated
2026-07-28
Current fill
62.9%vs 7 days ago
-0.1%losing
vs 1 year ago
-4.8%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. 40.182, -105.871 · Open in Google Maps
About Lake Granby and Dam
As of July 28, 2026, Lake Granby and Dam is filled to 62.9% of its total capacity, holding roughly 419 hm³ of water out of a maximum 666 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 4.8 points below its level on the same date a year earlier.
Across the readings we hold for Lake Granby and Dam — 1822 data points between July 31, 2021 and July 28, 2026 — the level has ranged from a low of 55.8% (March 24, 2022) to a high of 99.3% (July 8, 2023). On average the reservoir is fullest around July and at its lowest around April.
It is operated by BOR primarily for multiple purposes. It lies within the Colorado basin at 40.182°N, 105.871°W.
Key facts
- Current fill level
- 62.9%
- Water stored
- 419 hm³
- Total capacity
- 666 hm³
- 7-day change
- ▼ 0.1 pts
- Year-on-year
- ▼ 4.8 pts
- Primary use
- Multipurpose
- River basin
- Colorado
- Operator
- BOR
- Coordinates
- 40.182°N, 105.871°W
- Last updated
- July 28, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 28 Jul 2026 | 62.9% | 419 |
| 27 Jul 2026 | 63.0% | 420 |
| 26 Jul 2026 | 63.2% | 421 |
| 25 Jul 2026 | 63.4% | 422 |
| 24 Jul 2026 | 63.5% | 423 |
| 23 Jul 2026 | 63.7% | 424 |
| 22 Jul 2026 | 63.8% | 425 |
| 21 Jul 2026 | 64.0% | 426 |
| 20 Jul 2026 | 64.2% | 427 |
| 19 Jul 2026 | 64.4% | 429 |
| 18 Jul 2026 | 64.6% | 430 |
| 17 Jul 2026 | 64.7% | 431 |
Frequently asked questions
What is the current water level of Lake Granby and Dam?
As of July 28, 2026, Lake Granby and Dam is at 62.9% of its capacity, holding approximately 419 hm³ of water, according to BOR RISE (US Bureau of Reclamation) data.
Is Lake Granby and Dam reservoir full?
No. As of July 28, 2026, Lake Granby and Dam is within its normal operating range at 62.9% of its capacity, so it is not full.
Is the water level at Lake Granby and Dam rising or falling?
The level at Lake Granby and Dam has been broadly stable over the latest week on record (-0.1 points).
How much water can Lake Granby and Dam hold?
Lake Granby and Dam has a total capacity of 666 hm³.
Where is Lake Granby and Dam reservoir located?
Lake Granby and Dam is located in Colorado, United States, within the Colorado basin (coordinates 40.182°N, 105.871°W).
What is Lake Granby and Dam used for?
Lake Granby and Dam is used primarily for multiple purposes, and is managed by BOR.