Reservoir · California · United States · CDEC
TRINITY LAKE
70.1% full
Capacity
3,019.13 hm³
Volume stored
2117 hm³
Coordinates
40.801°N, 122.762°W
Last updated
2026-09-17
Current fill
70.1%vs 7 days ago
-1.0%losing
vs 1 year ago
-6.5%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: 2026-09-17.
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 September 17, 2026, TRINITY LAKE is filled to 70.1% of its total capacity, holding roughly 2,117 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 (-1.0 pts), and it is 6.5 points below its level on the same date a year earlier.
Across the readings we hold for TRINITY LAKE — 1822 data points between September 19, 2021 and September 17, 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
- 70.1%
- Water stored
- 2,117 hm³
- Total capacity
- 3,019 hm³
- 7-day change
- ▼ 1.0 pts
- Year-on-year
- ▼ 6.5 pts
- Primary use
- Multipurpose
- River basin
- California
- Operator
- CDEC
- Coordinates
- 40.801°N, 122.762°W
- Last updated
- September 17, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 17 Sep 2026 | 70.1% | 2,117 |
| 16 Sep 2026 | 70.3% | 2,121 |
| 15 Sep 2026 | 70.4% | 2,126 |
| 14 Sep 2026 | 70.5% | 2,130 |
| 13 Sep 2026 | 70.7% | 2,134 |
| 12 Sep 2026 | 70.8% | 2,138 |
| 11 Sep 2026 | 71.0% | 2,143 |
| 10 Sep 2026 | 71.1% | 2,147 |
| 9 Sep 2026 | 71.2% | 2,151 |
| 8 Sep 2026 | 71.4% | 2,154 |
| 7 Sep 2026 | 71.5% | 2,158 |
| 6 Sep 2026 | 71.6% | 2,162 |