Reservoir · Colorado · United States · BOR RISE
Shadow Mountain Lake
Shadow Mountain Lake and Dam
92.1% full
Capacity
22.66 hm³
Volume stored
21 hm³
Coordinates
40.207°N, 105.842°W
Last updated
2026-09-09
Current fill
92.1%vs 7 days ago
+0.7%gaining
vs 1 year ago
+1.1%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: 2026-09-09.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 40.207, -105.842 · Open in Google Maps
About Shadow Mountain Lake
As of September 9, 2026, Shadow Mountain Lake is filled to 92.1% of its total capacity, holding roughly 21 hm³ of water out of a maximum 23 hm³. At this level the reservoir is high.
Over the most recent week on record the fill level has held broadly steady (+0.7 pts), and it is 1.1 points above its level on the same date a year earlier.
Across the readings we hold for Shadow Mountain Lake — 1950 data points between September 12, 2021 and September 9, 2026 — the level has ranged from a low of 89.1% (June 12, 2022) to a high of 93.6% (May 26, 2026). On average the reservoir is fullest around January and at its lowest around June.
It is operated by BOR primarily for multiple purposes. It lies within the Colorado basin at 40.207°N, 105.842°W.
Key facts
- Current fill level
- 92.1%
- Water stored
- 21 hm³
- Total capacity
- 23 hm³
- 7-day change
- ▲ 0.7 pts
- Year-on-year
- ▲ 1.1 pts
- Primary use
- Multipurpose
- River basin
- Colorado
- Operator
- BOR
- Coordinates
- 40.207°N, 105.842°W
- Last updated
- September 9, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 9 Sep 2026 | 92.1% | 21 |
| 8 Sep 2026 | 91.8% | 21 |
| 7 Sep 2026 | 91.4% | 21 |
| 6 Sep 2026 | 91.1% | 21 |
| 5 Sep 2026 | 91.1% | 21 |
| 4 Sep 2026 | 91.2% | 21 |
| 3 Sep 2026 | 91.8% | 21 |
| 2 Sep 2026 | 91.4% | 21 |
| 1 Sep 2026 | 91.6% | 21 |
| 31 Aug 2026 | 92.2% | 21 |
| 30 Aug 2026 | 92.3% | 21 |
| 29 Aug 2026 | 92.2% | 21 |