Reservoir · California · United States · CDEC
PROSSER CREEK RESERVOIR
47.6% full
Capacity
36.81 hm³
Volume stored
18 hm³
Coordinates
39.379°N, 120.137°W
Last updated
2026-10-07
Current fill
47.6%vs 7 days ago
-3.2%losing
vs 1 year ago
+1.2%year-over-year
7-day trend
↓falling
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: 2026-10-07.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 39.379, -120.137 · Open in Google Maps
About PROSSER CREEK RESERVOIR
As of October 7, 2026, PROSSER CREEK RESERVOIR is filled to 47.6% of its total capacity, holding roughly 18 hm³ of water out of a maximum 37 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 3.2 percentage points, and it is 1.2 points above its level on the same date a year earlier.
Across the readings we hold for PROSSER CREEK RESERVOIR — 1821 data points between October 10, 2021 and October 7, 2026 — the level has ranged from a low of 10.8% (January 24, 2025) to a high of 103.3% (July 12, 2023). On average the reservoir is fullest around July and at its lowest around February.
It is operated by CDEC primarily for multiple purposes. It lies within the California basin at 39.379°N, 120.137°W.
Key facts
- Current fill level
- 47.6%
- Water stored
- 18 hm³
- Total capacity
- 37 hm³
- 7-day change
- ▼ 3.2 pts
- Year-on-year
- ▲ 1.2 pts
- Primary use
- Multipurpose
- River basin
- California
- Operator
- CDEC
- Coordinates
- 39.379°N, 120.137°W
- Last updated
- October 7, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 7 Oct 2026 | 47.6% | 18 |
| 6 Oct 2026 | 48.0% | 18 |
| 5 Oct 2026 | 48.5% | 18 |
| 4 Oct 2026 | 48.9% | 18 |
| 3 Oct 2026 | 49.4% | 18 |
| 2 Oct 2026 | 49.9% | 18 |
| 1 Oct 2026 | 50.3% | 19 |
| 30 Sep 2026 | 50.8% | 19 |
| 29 Sep 2026 | 51.2% | 19 |
| 28 Sep 2026 | 51.7% | 19 |
| 27 Sep 2026 | 52.2% | 19 |
| 26 Sep 2026 | 52.6% | 19 |