Reservoir · Colorado · United States · BOR RISE
Lake Granby
Lake Granby and Dam
49.0% full
Capacity
665.78 hm³
Volume stored
326 hm³
Vs month average
60% of normal
Coordinates
40.182°N, 105.871°W
Last updated
2026-10-12
Current fill
49.0%vs 7 days ago
-0.3%losing
vs 1 year ago
-32.9%year-over-year
7-day trend
→stable
Drought context
Storage vs October average
60%of normal
49.0% full on 2026-10-12, against an average of 82.3% for October across 6 years of readings (-33.3 points).
Drought Monitor at this site · 6 October 2026
D3extreme drought
The ground at Lake Granby's coordinates falls inside the D3 area of the weekly U.S. Drought Monitor map. That describes local conditions — rainfall, soil moisture, streamflow — not the reservoir's storage. Colorado drought figures →
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: 2026-10-12.
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
As of October 12, 2026, Lake Granby is filled to 49.0% of its total capacity, holding roughly 326 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 (-0.3 pts), and it is 32.9 points below its level on the same date a year earlier.
Across the readings we hold for Lake Granby — 1950 data points between October 14, 2021 and October 12, 2026 — the level has ranged from a low of 49.0% (October 10, 2026) to a high of 99.3% (July 8, 2023). On average the reservoir is fullest around July and at its lowest around March.
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
- 49.0%
- Water stored
- 326 hm³
- Total capacity
- 666 hm³
- 7-day change
- ▼ 0.3 pts
- Year-on-year
- ▼ 32.9 pts
- Primary use
- Multipurpose
- River basin
- Colorado
- Operator
- BOR
- Coordinates
- 40.182°N, 105.871°W
- Last updated
- October 12, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 12 Oct 2026 | 49.0% | 326 |
| 11 Oct 2026 | 49.0% | 326 |
| 10 Oct 2026 | 49.0% | 326 |
| 9 Oct 2026 | 49.1% | 327 |
| 8 Oct 2026 | 49.1% | 327 |
| 7 Oct 2026 | 49.2% | 327 |
| 6 Oct 2026 | 49.2% | 328 |
| 5 Oct 2026 | 49.3% | 328 |
| 4 Oct 2026 | 49.3% | 328 |
| 3 Oct 2026 | 49.3% | 328 |
| 2 Oct 2026 | 49.4% | 329 |
| 1 Oct 2026 | 49.4% | 329 |