Reservoir · Utah · United States · BOR RISE
Lost Lake
90.1% full
Capacity
1.42 hm³
Volume stored
1 hm³
Coordinates
40.674°N, 110.941°W
Last updated
2026-07-27
Current fill
90.1%vs 7 days ago
-1.4%losing
vs 1 year ago
-10.6%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: 2026-07-27.
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 July 27, 2026, Lost Lake is filled to 90.1% of its total capacity, holding roughly 1 hm³ of water out of a maximum 1 hm³. At this level the reservoir is high.
Over the most recent week on record the fill level has held broadly steady (-1.4 pts), and it is 10.6 points below its level on the same date a year earlier.
Across the readings we hold for Lost Lake — 1823 data points between July 31, 2021 and July 27, 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
- 90.1%
- Water stored
- 1 hm³
- Total capacity
- 1 hm³
- 7-day change
- ▼ 1.4 pts
- Year-on-year
- ▼ 10.6 pts
- Primary use
- Multipurpose
- River basin
- Utah
- Operator
- BOR
- Coordinates
- 40.674°N, 110.941°W
- Last updated
- July 27, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 27 Jul 2026 | 90.1% | 1 |
| 26 Jul 2026 | 91.5% | 1 |
| 25 Jul 2026 | 91.5% | 1 |
| 24 Jul 2026 | 92.3% | 1 |
| 23 Jul 2026 | 93.0% | 1 |
| 22 Jul 2026 | 93.7% | 1 |
| 21 Jul 2026 | 93.7% | 1 |
| 20 Jul 2026 | 93.7% | 1 |
| 19 Jul 2026 | 94.4% | 1 |
| 18 Jul 2026 | 95.1% | 1 |
| 17 Jul 2026 | 93.7% | 1 |
| 16 Jul 2026 | 91.5% | 1 |
Frequently asked questions
What is the current water level of Lost Lake?
As of July 27, 2026, Lost Lake is at 90.1% of its capacity, holding approximately 1 hm³ of water, according to BOR RISE (US Bureau of Reclamation) data.
Is Lost Lake reservoir full?
No. As of July 27, 2026, Lost Lake is high at 90.1% of its capacity, so it is not full.
Is the water level at Lost Lake rising or falling?
The level at Lost Lake has been broadly stable over the latest week on record (-1.4 points).
How much water can Lost Lake hold?
Lost Lake has a total capacity of 1 hm³.
Where is Lost Lake reservoir located?
Lost Lake is located in Utah, United States, within the Utah basin (coordinates 40.674°N, 110.941°W).
What is Lost Lake used for?
Lost Lake is used primarily for multiple purposes, and is managed by BOR.