Reservoir · California · United States · CDEC
FOLSOM LAKE
44.9% full
Capacity
1,205.06 hm³
Volume stored
542 hm³
Coordinates
38.683°N, 121.183°W
Last updated
2026-09-17
Current fill
44.9%vs 7 days ago
-0.9%losing
vs 1 year ago
-1.8%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. 38.683, -121.183 · Open in Google Maps
About FOLSOM LAKE
As of September 17, 2026, FOLSOM LAKE is filled to 44.9% of its total capacity, holding roughly 542 hm³ of water out of a maximum 1,205 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 1.8 points below its level on the same date a year earlier.
Across the readings we hold for FOLSOM LAKE — 1825 data points between September 19, 2021 and September 17, 2026 — the level has ranged from a low of 21.9% (October 21, 2021) to a high of 98.2% (May 12, 2026). 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 38.683°N, 121.183°W.
Key facts
- Current fill level
- 44.9%
- Water stored
- 542 hm³
- Total capacity
- 1,205 hm³
- 7-day change
- ▼ 0.9 pts
- Year-on-year
- ▼ 1.8 pts
- Primary use
- Multipurpose
- River basin
- California
- Operator
- CDEC
- Coordinates
- 38.683°N, 121.183°W
- Last updated
- September 17, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 17 Sep 2026 | 44.9% | 542 |
| 16 Sep 2026 | 45.0% | 543 |
| 15 Sep 2026 | 45.2% | 545 |
| 14 Sep 2026 | 45.3% | 546 |
| 13 Sep 2026 | 45.5% | 548 |
| 12 Sep 2026 | 45.6% | 550 |
| 11 Sep 2026 | 45.7% | 551 |
| 10 Sep 2026 | 45.8% | 552 |
| 9 Sep 2026 | 46.0% | 554 |
| 8 Sep 2026 | 45.9% | 554 |
| 7 Sep 2026 | 46.1% | 556 |
| 6 Sep 2026 | 46.4% | 559 |