Reservoir · Utah · United States · BOR RISE
Moon Lake Reservoir
Moon Lake Reservoir and Dam
34.7% full
Capacity
61.06 hm³
Volume stored
21 hm³
Vs month average
115% of normal
Coordinates
40.574°N, 110.507°W
Last updated
2026-10-14
Current fill
34.7%vs 7 days ago
+8.3%gaining
vs 1 year ago
+20.4%year-over-year
7-day trend
↑rising
Drought context
Storage vs October average
115%of normal
34.7% full on 2026-10-14, against an average of 30.1% for October across 6 years of readings (+4.6 points).
Drought Monitor at this site · 13 October 2026
D1moderate drought
The ground at Moon Lake Reservoir's coordinates falls inside the D1 area of the weekly U.S. Drought Monitor map. That describes local conditions — rainfall, soil moisture, streamflow — not the reservoir's storage. Utah 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: 2026-10-14.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 40.574, -110.507 · Open in Google Maps
About Moon Lake Reservoir
As of October 14, 2026, Moon Lake Reservoir is filled to 34.7% of its total capacity, holding roughly 21 hm³ of water out of a maximum 61 hm³. At this level the reservoir is low.
Over the most recent week on record the fill level has risen by 8.3 percentage points, and it is 20.4 points above its level on the same date a year earlier.
Across the readings we hold for Moon Lake Reservoir — 1825 data points between October 16, 2021 and October 14, 2026 — the level has ranged from a low of 10.8% (September 15, 2025) to a high of 77.8% (June 19, 2023). On average the reservoir is fullest around June and at its lowest around September.
It is operated by BOR primarily for multiple purposes. It lies within the Utah basin at 40.574°N, 110.507°W.
Key facts
- Current fill level
- 34.7%
- Water stored
- 21 hm³
- Total capacity
- 61 hm³
- 7-day change
- ▲ 8.3 pts
- Year-on-year
- ▲ 20.4 pts
- Primary use
- Multipurpose
- River basin
- Utah
- Operator
- BOR
- Coordinates
- 40.574°N, 110.507°W
- Last updated
- October 14, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 14 Oct 2026 | 34.7% | 21 |
| 13 Oct 2026 | 33.3% | 20 |
| 12 Oct 2026 | 31.4% | 19 |
| 11 Oct 2026 | 28.9% | 18 |
| 10 Oct 2026 | 27.2% | 17 |
| 9 Oct 2026 | 26.9% | 16 |
| 8 Oct 2026 | 26.6% | 16 |
| 7 Oct 2026 | 26.4% | 16 |
| 6 Oct 2026 | 26.1% | 16 |
| 5 Oct 2026 | 25.9% | 16 |
| 4 Oct 2026 | 25.6% | 16 |
| 3 Oct 2026 | 25.4% | 16 |