Reservoir · Colorado · United States · BOR RISE
Lake Nighthorse
Lake Nighthorse and Ridges Basin Dam
92.7% full
Capacity
149.34 hm³
Volume stored
138 hm³
Coordinates
37.224°N, 107.917°W
Last updated
2026-09-09
Current fill
92.7%vs 7 days ago
-0.1%losing
vs 1 year ago
-0.6%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: 2026-09-09.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 37.224, -107.917 · Open in Google Maps
About Lake Nighthorse
As of September 9, 2026, Lake Nighthorse is filled to 92.7% of its total capacity, holding roughly 138 hm³ of water out of a maximum 149 hm³. At this level the reservoir is high.
Over the most recent week on record the fill level has held broadly steady (-0.1 pts), and it sits close to where it was a year earlier.
Across the readings we hold for Lake Nighthorse — 1824 data points between September 12, 2021 and September 9, 2026 — the level has ranged from a low of 92.2% (November 20, 2023) to a high of 95.0% (June 7, 2022). On average the reservoir is fullest around June and at its lowest around February.
It is operated by BOR primarily for multiple purposes. It lies within the Colorado basin at 37.224°N, 107.917°W.
Key facts
- Current fill level
- 92.7%
- Water stored
- 138 hm³
- Total capacity
- 149 hm³
- 7-day change
- ▼ 0.1 pts
- Year-on-year
- ▼ 0.6 pts
- Primary use
- Multipurpose
- River basin
- Colorado
- Operator
- BOR
- Coordinates
- 37.224°N, 107.917°W
- Last updated
- September 9, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 9 Sep 2026 | 92.7% | 138 |
| 8 Sep 2026 | 92.7% | 138 |
| 7 Sep 2026 | 92.7% | 138 |
| 6 Sep 2026 | 92.7% | 138 |
| 5 Sep 2026 | 92.7% | 139 |
| 4 Sep 2026 | 92.7% | 139 |
| 3 Sep 2026 | 92.7% | 139 |
| 2 Sep 2026 | 92.8% | 139 |
| 1 Sep 2026 | 92.8% | 139 |
| 31 Aug 2026 | 92.8% | 139 |
| 30 Aug 2026 | 92.8% | 139 |
| 29 Aug 2026 | 92.9% | 139 |