Reservoir · Oregon · United States · BOR RISE
Phillips Lake and Mason Dam (PHL)
11.1% full
Capacity
96.83 hm³
Volume stored
11 hm³
Coordinates
44.672°N, 118.000°W
Last updated
2026-07-28
Current fill
11.1%vs 7 days ago
-0.5%losing
vs 1 year ago
-19.4%year-over-year
7-day trend
→stable
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: 2026-07-28.
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 (PHL)
As of July 28, 2026, Phillips Lake and Mason Dam (PHL) is filled to 11.1% of its total capacity, holding roughly 11 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 held broadly steady (-0.5 pts), and it is 19.4 points below its level on the same date a year earlier.
Across the readings we hold for Phillips Lake and Mason Dam (PHL) — 2080 data points between July 31, 2021 and July 28, 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
- 11.1%
- Water stored
- 11 hm³
- Total capacity
- 97 hm³
- 7-day change
- ▼ 0.5 pts
- Year-on-year
- ▼ 19.4 pts
- Primary use
- Multipurpose
- River basin
- Oregon
- Operator
- BOR
- Coordinates
- 44.672°N, 118.000°W
- Last updated
- July 28, 2026
Recent readings
| Date | Fill level | Volume (hm³) |
|---|---|---|
| 28 Jul 2026 | 11.1% | 11 |
| 27 Jul 2026 | 11.6% | 11 |
| 26 Jul 2026 | 12.1% | 12 |
| 25 Jul 2026 | 12.6% | 12 |
| 24 Jul 2026 | 13.1% | 13 |
| 22 Jul 2026 | 14.0% | 14 |
| 21 Jul 2026 | 14.5% | 14 |
| 20 Jul 2026 | 14.9% | 14 |
| 19 Jul 2026 | 15.4% | 15 |
| 18 Jul 2026 | 15.9% | 15 |
| 17 Jul 2026 | 16.4% | 16 |
| 16 Jul 2026 | 16.9% | 16 |
Frequently asked questions
What is the current water level of Phillips Lake and Mason Dam (PHL)?
As of July 28, 2026, Phillips Lake and Mason Dam (PHL) is at 11.1% of its capacity, holding approximately 11 hm³ of water, according to BOR RISE (US Bureau of Reclamation) data.
Is Phillips Lake and Mason Dam (PHL) reservoir full?
No. As of July 28, 2026, Phillips Lake and Mason Dam (PHL) is critically low at 11.1% of its capacity, so it is not full.
Is the water level at Phillips Lake and Mason Dam (PHL) rising or falling?
The level at Phillips Lake and Mason Dam (PHL) has been broadly stable over the latest week on record (-0.5 points).
How much water can Phillips Lake and Mason Dam (PHL) hold?
Phillips Lake and Mason Dam (PHL) has a total capacity of 97 hm³.
Where is Phillips Lake and Mason Dam (PHL) reservoir located?
Phillips Lake and Mason Dam (PHL) is located in Oregon, United States, within the Oregon basin (coordinates 44.672°N, 118.000°W).
What is Phillips Lake and Mason Dam (PHL) used for?
Phillips Lake and Mason Dam (PHL) is used primarily for multiple purposes, and is managed by BOR.