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Phillips Lake and Mason water level

Reservoir, Oregon, United States

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Right now

Very low for mid-October

Surface elevation

3,983.22ft Down 0.58 ft over the last 7 days

Water stored
481 acre‑ft
4,000 4,025

History

History
3,9804,0004,0204,040ftOct 12Oct 13Oct 14Oct 15Oct 163,9804,0004,0204,040ftOct 12Oct 14Oct 16
3,9804,0004,0204,040ftSep 19Sep 25Oct 2Oct 9Oct 163,9804,0004,0204,040ftSep 19Oct 2Oct 16
4,0004,0254,050ftOct 2025Jan 2026Apr 2026Jul 2026Oct 20264,0004,0254,050ftOct 2025Apr 2026Oct 2026
3,9754,0004,0254,050ftOct 2016Apr 2019Oct 2021Apr 2024Oct 20263,9754,0004,0254,050ftOct 2016Oct 2021Oct 2026
4,0004,050ftJanMarMayJulSepNov20264,0004,050ftJanAprJulOct2026

202120222023202420252026

Surface elevation Normal range (10–90 %)

What this means

At 3,983.22 ft, Phillips Lake and Mason is far below normal for mid-October.

That puts it 34.32 ft below the median of 4,017.54 ft for mid-October, based on 36 years of readings. A year ago it stood at 4,021.12 ft (−37.90 ft).

The level is falling, down 0.58 ft over the past week. With the water still dropping, the shoreline keeps moving out. Over the past 30 days it has moved between 3,983.22 ft and 3,985.41 ft.

Many reservoirs are drawn down through summer and fall; most of the refill comes later, with winter rain or spring snowmelt.

Compared with 36 years of daily readings for this time of year. How to read levels

Key numbers

Median for this date
4,017.54 ft34.32 ft below the median for this date
Normal for this date
3,989.56 ft – 4,041.33 ft8 years in 10 fall in this range (36 years of records)
Same day last year
4,021.12 ft−37.90 ft
Lowest and highest in 30 days
3,983.22 ft – 3,985.41 ft
Lowest and highest in 12 months
3,983.22 ft – 4,036.43 ft

Swimming and boating at Phillips Lake and Mason

Low water changes a lake fast for boaters. Some ramps get shorter or close, docks may be moved, and rocks and sandbars that are usually well under the surface come within reach of a prop.

If you swim, pick a spot with an easy way out, and remember that drop-offs move as the level changes.

Weather at the gauge

No rain in the last 3 days.

17 Sat 72° 45° – Wind 9 mph
18 Sun 67° 39° – Wind 7 mph
19 Mon 68° 47° – Wind 13 mph
20 Tue 64° 46° 0.00 in Wind 5 mph
21 Wed 59° 47° 0.15 in Wind 7 mph
22 Thu 58° 41° – Wind 6 mph
23 Fri 60° 37° – Wind 9 mph

Forecast: Open-Meteo

Sunrise 07:12 AM Sunset 06:04 PM Daylight 10 hr, 52 min First quarter 45%

Map

Nearby gauges

Gauge Level Compared with normal 24 hours Distance
Unity ReservoirReservoir 3,786.18 ft Normal 15 mi
Thief Valley ReservoirReservoir 3,096.44 ft Very low 26 mi
John Day River at Blue Mountain Hot Springs near Prairie CityRiver gauge, John Day River 23.7 cfs Very low ±0 36 mi
Mf John Day River above Camp Creek, near GalenaRiver gauge, Mf John Day River 15.5 cfs Very low ±0 39 mi
East Fork Wallowa River near JosephRiver gauge, East Fork Wallowa River 9.6 cfs High −0.5 cfs 57 mi

Questions and answers

How does Phillips Lake and Mason compare with last year?

It is 37.90 ft lower than on the same day last year, when the reading was 4,021.12 ft.

What is a normal level for Phillips Lake and Mason in mid-October?

The median for mid-October is 4,017.54 ft. In 8 years out of 10 the reading falls between 3,989.56 ft and 4,041.33 ft, based on 36 years of records.

Is Phillips Lake and Mason really 3,983.22 ft deep?

No. 3,983.22 ft is the height of the water surface above sea level (or the agency's vertical datum), not the depth of the water.

What is the water level of Phillips Lake and Mason today?

On Oct 16, 2026, the surface elevation was 3,983.22 ft. Down 0.58 ft over the last 7 days.

Is Phillips Lake and Mason rising or falling?

Down 0.58 ft over the last 7 days.

Is the level of Phillips Lake and Mason normal?

Very low for mid-October. Compared with 36 years of daily readings for this time of year.

How often is this data updated?

The U.S. Bureau of Reclamation publishes a new reading once a day. This page refreshes within minutes of each update.

For specialists

Station codes, datum, parameters, data quality and downloads
Operator
U.S. Bureau of Reclamation
Station code
usbr:7195 (Agency page)
Coordinates
44.67167, -118.00000 (WGS84)
Update interval
once a day
Licence
Public domain. Data: U.S. Bureau of Reclamation (RISE), provisional data subject to revision

Published series

ParameterLast valueTime (UTC)Quality
Surface elevation 3,983.22 ft 2026-10-16 07:00 Provisional
Water stored 481 acre‑ft 2026-10-16 07:00 Provisional

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How to cite

U.S. Bureau of Reclamation: Phillips Lake and Mason (usbr:7195). Accessed October 18, 2026 via Nivelmap, https://nivelmap.com/en/united-states/oregon/phillips-lake-and-mason

How we check values

Each reading is stored as published. We hold back values that jump faster than physically plausible and show the measurement time with every value.