Reservoir · California · United States · CDEC
PROSSER CREEK RESERVOIR
57.3% full
Capacity
36.81 hm³
Volume stored
21 hm³
Coordinates
39.379°N, 120.137°W
Last updated
2026-09-16
Current fill
57.3%vs 7 days ago
-1.9%losing
vs 1 year ago
+1.8%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: 2026-09-16.
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 September 16, 2026, PROSSER CREEK RESERVOIR is filled to 57.3% of its total capacity, holding roughly 21 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 1.9 percentage points, and it is 1.8 points above its level on the same date a year earlier.
Across the readings we hold for PROSSER CREEK RESERVOIR — 1822 data points between September 19, 2021 and September 16, 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
- 57.3%
- Water stored
- 21 hm³
- Total capacity
- 37 hm³
- 7-day change
- ▼ 1.9 pts
- Year-on-year
- ▲ 1.8 pts
- Primary use
- Multipurpose
- River basin
- California
- Operator
- CDEC
- Coordinates
- 39.379°N, 120.137°W
- Last updated
- September 16, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 16 Sep 2026 | 57.3% | 21 |
| 15 Sep 2026 | 57.6% | 21 |
| 14 Sep 2026 | 57.8% | 21 |
| 13 Sep 2026 | 58.1% | 21 |
| 12 Sep 2026 | 58.4% | 22 |
| 11 Sep 2026 | 58.7% | 22 |
| 10 Sep 2026 | 59.0% | 22 |
| 9 Sep 2026 | 59.2% | 22 |
| 8 Sep 2026 | 59.5% | 22 |
| 7 Sep 2026 | 59.7% | 22 |
| 6 Sep 2026 | 60.0% | 22 |
| 5 Sep 2026 | 60.3% | 22 |