Reservoir · Nevada · United States · USGS NWIS
Topaz Lake
54.4% full
Capacity
73.52 hm³
Volume stored
40 hm³
Coordinates
38.693°N, 119.520°W
Last updated
2026-08-12
Current fill
54.4%vs 7 days ago
-5.3%losing
vs 1 year ago
-0.2%year-over-year
7-day trend
↓falling
Data source: USGS National Water Information System (NWIS) — 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: 2026-08-12.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 38.693, -119.520 · Open in Google Maps
About Topaz Lake
As of August 12, 2026, Topaz Lake is filled to 54.4% of its total capacity, holding roughly 40 hm³ of water out of a maximum 74 hm³. At this level the reservoir is within its normal operating range.
Over the most recent week on record the fill level has fallen by 5.3 percentage points, and it sits close to where it was a year earlier.
Across the readings we hold for Topaz Lake — 1460 data points between August 14, 2022 and August 12, 2026 — the level has ranged from a low of 15.1% (May 11, 2023) to a high of 99.6% (March 24, 2024). On average the reservoir is fullest around June and at its lowest around October.
It is operated by USGS primarily for multiple purposes. It lies within the Nevada basin at 38.693°N, 119.520°W.
Key facts
- Current fill level
- 54.4%
- Water stored
- 40 hm³
- Total capacity
- 74 hm³
- 7-day change
- ▼ 5.3 pts
- Year-on-year
- ▼ 0.2 pts
- Primary use
- Multipurpose
- River basin
- Nevada
- Operator
- USGS
- Coordinates
- 38.693°N, 119.520°W
- Last updated
- August 12, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 12 Aug 2026 | 54.4% | 40 |
| 11 Aug 2026 | 54.9% | 40 |
| 10 Aug 2026 | 55.7% | 41 |
| 9 Aug 2026 | 56.6% | 42 |
| 8 Aug 2026 | 57.3% | 42 |
| 7 Aug 2026 | 58.1% | 43 |
| 6 Aug 2026 | 58.9% | 43 |
| 5 Aug 2026 | 59.7% | 44 |
| 4 Aug 2026 | 60.5% | 45 |
| 3 Aug 2026 | 61.3% | 45 |
| 2 Aug 2026 | 62.2% | 46 |
| 1 Aug 2026 | 63.0% | 46 |
Frequently asked questions
What is the current water level of Topaz Lake?
As of August 12, 2026, Topaz Lake is at 54.4% of its capacity, holding approximately 40 hm³ of water, according to USGS NWIS data.
Is Topaz Lake reservoir full?
No. As of August 12, 2026, Topaz Lake is within its normal operating range at 54.4% of its capacity, so it is not full.
Is the water level at Topaz Lake rising or falling?
The level at Topaz Lake is falling — it dropped 5.3 percentage points over the latest week on record.
How much water can Topaz Lake hold?
Topaz Lake has a total capacity of 74 hm³.
Where is Topaz Lake reservoir located?
Topaz Lake is located in Nevada, United States, within the Nevada basin (coordinates 38.693°N, 119.520°W).
What is Topaz Lake used for?
Topaz Lake is used primarily for multiple purposes, and is managed by USGS.