Reservoir · Nevada · United States · USGS NWIS
Topaz Lake
33.1% full
Capacity
73.52 hm³
Volume stored
24 hm³
Coordinates
38.693°N, 119.520°W
Last updated
2026-09-30
Current fill
33.1%vs 7 days ago
-2.5%losing
vs 1 year ago
-1.1%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: 2026-09-30.
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 September 30, 2026, Topaz Lake is filled to 33.1% of its total capacity, holding roughly 24 hm³ of water out of a maximum 74 hm³. At this level the reservoir is low.
Over the most recent week on record the fill level has fallen by 2.5 percentage points, and it is 1.1 points below its level on the same date a year earlier.
Across the readings we hold for Topaz Lake — 1461 data points between October 1, 2022 and September 30, 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
- 33.1%
- Water stored
- 24 hm³
- Total capacity
- 74 hm³
- 7-day change
- ▼ 2.5 pts
- Year-on-year
- ▼ 1.1 pts
- Primary use
- Multipurpose
- River basin
- Nevada
- Operator
- USGS
- Coordinates
- 38.693°N, 119.520°W
- Last updated
- September 30, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 30 Sep 2026 | 33.1% | 24 |
| 29 Sep 2026 | 33.4% | 25 |
| 28 Sep 2026 | 33.7% | 25 |
| 27 Sep 2026 | 34.0% | 25 |
| 26 Sep 2026 | 34.4% | 25 |
| 25 Sep 2026 | 34.8% | 26 |
| 24 Sep 2026 | 35.2% | 26 |
| 23 Sep 2026 | 35.6% | 26 |
| 22 Sep 2026 | 35.9% | 26 |
| 21 Sep 2026 | 36.3% | 27 |
| 20 Sep 2026 | 36.6% | 27 |
| 19 Sep 2026 | 37.0% | 27 |