Swift Reservoir

Name: Swift Reservoir (Washington) water level
Creator: U.S. Geological Survey

3.2 mi East Of Dam Near Cougar, WA · Washington · USGS gauge

Grey bar: recent range 952.9–968.0 ft.

Water level · NGVD29

952.00FT

Gauge elevation · no % full published

7 days −7.00 ft30 days −16.00 ftvs last year −10.00 ft

Reading for Oct 25, 2026, 18:00 UTC · page refreshed Oct 25, 21:16 UTC
Source: U.S. Geological Survey (Water Data for the Nation)

Worth going today?Today

Windy or wet – use caution

Light wind, 90% chance of rain

Wind5 mph

Rain90%

Temp48°F

Level952.0 ft

TodayRain · 48°F
ENE 5 mph · rain 90%

TonightRain · 43°F
NE 2 to 6 mph · rain 91%

NWS forecast for the gauge location. Good = wind ≤ 10 mph and rain ≤ 30%; storms are flagged. Not safety advice – check local conditions, closures and warnings.

Level history

Last 30 days of daily means.

Field notes

Swift Reservoir's latest daily level (Oct 25, 2026) is 952.00 (NGVD29) ft.

Over the past 7 days the lake has been falling (−7.00 ft), and it is −16.00 ft over 30 days.

Compared with a year ago (962.00 ft, same time of day), the lake is 10.00 ft lower.

Readings come from the USGS gauge “SWIFT RESERVOIR 3.2 MI EAST OF DAM NEAR COUGAR, WA”. Gauge elevations are not directly comparable between lakes because each uses its own datum.

Lake facts

Gauge / station	SWIFT RESERVOIR 3.2 MI EAST OF DAM NEAR COUGAR, WA
Elevation datum	ft (NGVD29)
Gauge location	46.0626, -122.1323

Nearby lakes

Yale Reservoir9 mi W471.00 ft−2.00 ft Lake Merwin14 mi SW230.00 ft+1.00 ft Spirit Lake West14 mi N3,441.98 ft−0.62 ft Spirit Lake15 mi N3,442.22 ft—Castle Lake15 mi NW2,577.71 ft±0.00 ft

Common questions

Is Swift Reservoir rising or falling?

Over the last 7 days it changed −7.00 ft and over 30 days −16.00 ft.

How full is Swift Reservoir?

USGS publishes the water surface elevation for this gauge but not a percent-full figure, so we don't show one rather than estimate it.

How often is this page updated?

The page is rebuilt automatically every day from USGS's published data. Values can be revised later by the source agency.

Where does the data come from?

The U.S. Geological Survey's Water Data API (api.waterdata.usgs.gov), which publishes readings from USGS and partner gauges. Forecasts come from the National Weather Service.

Latest instantaneous reading; 7-day, 30-day and year-ago changes compare readings at the same hour. USGS data are provisional and subject to revision. This page is not affiliated with or endorsed by the USGS. See data sources.