Reservoir · Colorado · United States · BOR RISE
Lake Nighthorse
Lake Nighthorse and Ridges Basin Dam
93.7% full
Capacity
149.34 hm³
Volume stored
140 hm³
Vs month average
100% of normal
Coordinates
37.224°N, 107.917°W
Last updated
2026-10-26
Current fill
93.7%vs 7 days ago
+0.8 ppgaining
vs 1 year ago
+0.5 ppyear-over-year
7-day trend
→stable
Drought context
Storage vs October average
100%of normal
93.7% full on 2026-10-26, against an average of 93.3% for October across 6 years of readings (+0.4 points).
Drought Monitor at this site · 20 October 2026
D0abnormally dry
The ground at Lake Nighthorse's coordinates falls inside the D0 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: 2026-10-26.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 37.224°N, 107.917°W · Open in Google Maps
About Lake Nighthorse
As of October 26, 2026, Lake Nighthorse is filled to 93.7% of its total capacity, holding 139.96 hm³ of water out of a maximum 149.34 hm³. At this level the reservoir is high.
Over the most recent week on record the fill level has held broadly steady (+0.8 pp), and it sits close to where it was a year earlier.
Across the readings we hold for Lake Nighthorse — 1824 data points between October 29, 2021 and October 26, 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 is at 37.224°N, 107.917°W.
Key facts
- Current fill level
- 93.7% of total capacity
- Water stored
- 139.96 hm³
- Total capacity
- 149.34 hm³
- 7-day change
- ▲ 0.8 pp
- Year-on-year
- ▲ 0.5 pp
- Primary use
- Multipurpose
- Operator
- BOR
- Coordinates
- 37.224°N, 107.917°W
- Last updated
- October 26, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 26 Oct 2026 | 93.7% | 139.96 |
| 25 Oct 2026 | 93.7% | 139.96 |
| 24 Oct 2026 | 93.6% | 139.8 |
| 23 Oct 2026 | 93.5% | 139.58 |
| 22 Oct 2026 | 93.4% | 139.51 |
| 21 Oct 2026 | 93.0% | 138.94 |
| 20 Oct 2026 | 92.9% | 138.78 |
| 19 Oct 2026 | 92.9% | 138.8 |
| 18 Oct 2026 | 92.9% | 138.8 |
| 17 Oct 2026 | 93.0% | 138.83 |
| 16 Oct 2026 | 93.0% | 138.83 |
| 15 Oct 2026 | 93.0% | 138.83 |