Reservoir · Oregon · United States · BOR RISE
Phillips Lake and Mason Dam
5.3% full
Capacity
96.83 hm³
Volume stored
5 hm³
Coordinates
44.672°N, 118.000°W
Last updated
2026-08-12
Current fill
5.3%vs 7 days ago
-2.6%losing
vs 1 year ago
-41.1%year-over-year
7-day trend
↓falling
Data source: BOR RISE — US Bureau of Reclamation — 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: 2026-08-12.
Catchment Weather
Past 30 days + 14-day forecast · Open-Meteo
Satellite imagery: Esri, Maxar, Earthstar Geographics. Map: Esri, HERE, Garmin, © OpenStreetMap contributors. 44.672, -118.000 · Open in Google Maps
About Phillips Lake and Mason Dam
As of August 12, 2026, Phillips Lake and Mason Dam is filled to 5.3% of its total capacity, holding roughly 5 hm³ of water out of a maximum 97 hm³. At this level the reservoir is critically low.
Over the most recent week on record the fill level has fallen by 2.6 percentage points, and it is 41.1 points below its level on the same date a year earlier.
Across the readings we hold for Phillips Lake and Mason Dam — 2080 data points between August 15, 2021 and August 12, 2026 — the level has ranged from a low of 0.0% (December 8, 2021) to a high of 77.3% (June 8, 2025). On average the reservoir is fullest around June and at its lowest around December.
It is operated by BOR primarily for multiple purposes. It lies within the Oregon basin at 44.672°N, 118.000°W.
Key facts
- Current fill level
- 5.3%
- Water stored
- 5 hm³
- Total capacity
- 97 hm³
- 7-day change
- ▼ 2.6 pts
- Year-on-year
- ▼ 41.1 pts
- Primary use
- Multipurpose
- River basin
- Oregon
- Operator
- BOR
- Coordinates
- 44.672°N, 118.000°W
- Last updated
- August 12, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 12 Aug 2026 | 5.3% | 5 |
| 11 Aug 2026 | 5.6% | 5 |
| 10 Aug 2026 | 5.9% | 6 |
| 9 Aug 2026 | 6.3% | 6 |
| 8 Aug 2026 | 6.7% | 7 |
| 7 Aug 2026 | 7.1% | 7 |
| 6 Aug 2026 | 7.5% | 7 |
| 5 Aug 2026 | 7.9% | 8 |
| 4 Aug 2026 | 8.3% | 8 |
| 3 Aug 2026 | 8.6% | 8 |
| 2 Aug 2026 | 9.0% | 9 |
| 1 Aug 2026 | 9.4% | 9 |
Frequently asked questions
What is the current water level of Phillips Lake and Mason Dam?
As of August 12, 2026, Phillips Lake and Mason Dam is at 5.3% of its capacity, holding approximately 5 hm³ of water, according to BOR RISE (US Bureau of Reclamation) data.
Is Phillips Lake and Mason Dam reservoir full?
No. As of August 12, 2026, Phillips Lake and Mason Dam is critically low at 5.3% of its capacity, so it is not full.
Is the water level at Phillips Lake and Mason Dam rising or falling?
The level at Phillips Lake and Mason Dam is falling — it dropped 2.6 percentage points over the latest week on record.
How much water can Phillips Lake and Mason Dam hold?
Phillips Lake and Mason Dam has a total capacity of 97 hm³.
Where is Phillips Lake and Mason Dam reservoir located?
Phillips Lake and Mason Dam is located in Oregon, United States, within the Oregon basin (coordinates 44.672°N, 118.000°W).
What is Phillips Lake and Mason Dam used for?
Phillips Lake and Mason Dam is used primarily for multiple purposes, and is managed by BOR.