Reservoir · California · United States · CDEC
Prosser Creek Reservoir
69.9% full
Capacity
36.81 hm³
Volume stored
26 hm³
Coordinates
39.379°N, 120.137°W
Last updated
2026-08-02
Current fill
69.9%vs 7 days ago
-2.4%losing
vs 1 year ago
-8.2%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: 2026-08-02.
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 August 2, 2026, Prosser Creek Reservoir is filled to 69.9% of its total capacity, holding roughly 26 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 2.4 percentage points, and it is 8.2 points below its level on the same date a year earlier.
Across the readings we hold for Prosser Creek Reservoir — 1822 data points between August 5, 2021 and August 2, 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
- 69.9%
- Water stored
- 26 hm³
- Total capacity
- 37 hm³
- 7-day change
- ▼ 2.4 pts
- Year-on-year
- ▼ 8.2 pts
- Primary use
- Multipurpose
- River basin
- California
- Operator
- CDEC
- Coordinates
- 39.379°N, 120.137°W
- Last updated
- August 2, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 2 Aug 2026 | 69.9% | 26 |
| 1 Aug 2026 | 70.2% | 26 |
| 31 Jul 2026 | 70.5% | 26 |
| 30 Jul 2026 | 70.8% | 26 |
| 29 Jul 2026 | 71.1% | 26 |
| 28 Jul 2026 | 71.4% | 26 |
| 27 Jul 2026 | 71.7% | 26 |
| 26 Jul 2026 | 72.3% | 27 |
| 25 Jul 2026 | 72.3% | 27 |
| 24 Jul 2026 | 79.3% | 29 |
| 23 Jul 2026 | 72.9% | 27 |
| 22 Jul 2026 | 73.4% | 27 |
Frequently asked questions
What is the current water level of Prosser Creek Reservoir?
As of August 2, 2026, Prosser Creek Reservoir is at 69.9% of its capacity, holding approximately 26 hm³ of water, according to CDEC (CA DWR) data.
Is Prosser Creek Reservoir reservoir full?
No. As of August 2, 2026, Prosser Creek Reservoir is within its normal operating range at 69.9% of its capacity, so it is not full.
Is the water level at Prosser Creek Reservoir rising or falling?
The level at Prosser Creek Reservoir is falling — it dropped 2.4 percentage points over the latest week on record.
How much water can Prosser Creek Reservoir hold?
Prosser Creek Reservoir has a total capacity of 37 hm³.
Where is Prosser Creek Reservoir reservoir located?
Prosser Creek Reservoir is located in California, United States, within the California basin (coordinates 39.379°N, 120.137°W).
What is Prosser Creek Reservoir used for?
Prosser Creek Reservoir is used primarily for multiple purposes, and is managed by CDEC.