Reservoir · Utah · United States · BOR RISE
Lost Lake
59.9% full
Capacity
1.42 hm³
Volume stored
1 hm³
Vs month average
104% of normal
Coordinates
40.674°N, 110.941°W
Last updated
2026-10-13
Current fill
59.9%vs 7 days ago
+2.9%gaining
vs 1 year ago
+12.0%year-over-year
7-day trend
↑rising
Drought context
Storage vs October average
104%of normal
59.9% full on 2026-10-13, against an average of 57.6% for October across 6 years of readings (+2.3 points).
Drought Monitor at this site · 13 October 2026
D1moderate drought
The ground at Lost Lake'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: 2026-10-13.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 40.674, -110.941 · Open in Google Maps
About Lost Lake
As of October 13, 2026, Lost Lake is filled to 59.9% of its total capacity, holding roughly 1 hm³ of water out of a maximum 1 hm³. At this level the reservoir is within its normal operating range.
Over the most recent week on record the fill level has risen by 2.9 percentage points, and it is 12.0 points above its level on the same date a year earlier.
Across the readings we hold for Lost Lake — 1824 data points between October 16, 2021 and October 13, 2026 — the level has ranged from a low of 46.5% (April 30, 2023) to a high of 102.8% (June 5, 2024). On average the reservoir is fullest around June and at its lowest around October.
It is operated by BOR primarily for multiple purposes. It lies within the Utah basin at 40.674°N, 110.941°W.
Key facts
- Current fill level
- 59.9%
- Water stored
- 1 hm³
- Total capacity
- 1 hm³
- 7-day change
- ▲ 2.9 pts
- Year-on-year
- ▲ 12.0 pts
- Primary use
- Multipurpose
- River basin
- Utah
- Operator
- BOR
- Coordinates
- 40.674°N, 110.941°W
- Last updated
- October 13, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 13 Oct 2026 | 59.9% | 1 |
| 12 Oct 2026 | 59.2% | 1 |
| 11 Oct 2026 | 57.7% | 1 |
| 10 Oct 2026 | 57.0% | 1 |
| 9 Oct 2026 | 57.0% | 1 |
| 8 Oct 2026 | 57.0% | 1 |
| 7 Oct 2026 | 57.0% | 1 |
| 6 Oct 2026 | 57.0% | 1 |
| 5 Oct 2026 | 57.7% | 1 |
| 4 Oct 2026 | 57.7% | 1 |
| 3 Oct 2026 | 57.7% | 1 |
| 2 Oct 2026 | 57.7% | 1 |