Reservoir · California · United States · CDEC
Trinity Lake
77.2% full
Capacity
3,019.13 hm³
Volume stored
2330 hm³
Coordinates
40.801°N, 122.762°W
Last updated
2026-08-03
Current fill
77.2%vs 7 days ago
-0.9%losing
vs 1 year ago
-7.4%year-over-year
7-day trend
→stable
Data source: CDEC — California Dept of Water Resources — 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: 2026-08-03.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 40.801, -122.762 · Open in Google Maps
About Trinity Lake
As of August 3, 2026, Trinity Lake is filled to 77.2% of its total capacity, holding roughly 2,330 hm³ of water out of a maximum 3,019 hm³. At this level the reservoir is within its normal operating range.
Over the most recent week on record the fill level has held broadly steady (-0.9 pts), and it is 7.4 points below its level on the same date a year earlier.
Across the readings we hold for Trinity Lake — 1822 data points between August 5, 2021 and August 3, 2026 — the level has ranged from a low of 21.3% (December 19, 2022) to a high of 92.8% (June 3, 2025). On average the reservoir is fullest around June and at its lowest around November.
It is operated by CDEC primarily for multiple purposes. It lies within the California basin at 40.801°N, 122.762°W.
Key facts
- Current fill level
- 77.2%
- Water stored
- 2,330 hm³
- Total capacity
- 3,019 hm³
- 7-day change
- ▼ 0.9 pts
- Year-on-year
- ▼ 7.4 pts
- Primary use
- Multipurpose
- River basin
- California
- Operator
- CDEC
- Coordinates
- 40.801°N, 122.762°W
- Last updated
- August 3, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 3 Aug 2026 | 77.2% | 2,330 |
| 2 Aug 2026 | 77.3% | 2,334 |
| 1 Aug 2026 | 77.4% | 2,337 |
| 31 Jul 2026 | 77.6% | 2,341 |
| 30 Jul 2026 | 77.6% | 2,344 |
| 29 Jul 2026 | 77.7% | 2,347 |
| 28 Jul 2026 | 77.9% | 2,352 |
| 27 Jul 2026 | 78.1% | 2,358 |
| 26 Jul 2026 | 78.3% | 2,364 |
| 25 Jul 2026 | 78.5% | 2,370 |
| 24 Jul 2026 | 78.5% | 2,371 |
| 23 Jul 2026 | 78.6% | 2,372 |
Frequently asked questions
What is the current water level of Trinity Lake?
As of August 3, 2026, Trinity Lake is at 77.2% of its capacity, holding approximately 2,330 hm³ of water, according to CDEC (CA DWR) data.
Is Trinity Lake reservoir full?
No. As of August 3, 2026, Trinity Lake is within its normal operating range at 77.2% of its capacity, so it is not full.
Is the water level at Trinity Lake rising or falling?
The level at Trinity Lake has been broadly stable over the latest week on record (-0.9 points).
How much water can Trinity Lake hold?
Trinity Lake has a total capacity of 3,019 hm³.
Where is Trinity Lake reservoir located?
Trinity Lake is located in California, United States, within the California basin (coordinates 40.801°N, 122.762°W).
What is Trinity Lake used for?
Trinity Lake is used primarily for multiple purposes, and is managed by CDEC.