South Fork Tolt Reservoir

Name: South Fork Tolt Reservoir (Washington) water level
Creator: U.S. Geological Survey

near Carnation, WA · Washington · USGS gauge

Water level · NGVD29

1,719.77FT

Gauge elevation · no % full published

7 days −2.72 ft30 days −8.36 ftvs last year −3.82 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, 60% chance of rain

Wind7 mph

Rain60%

Temp46°F

Level1,719.8 ft

TodayLight Rain Likely · 46°F
SE 7 mph · rain 60%

TonightChance Light Rain · 39°F
E 3 to 12 mph · rain 40%

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.

Field notes

South Fork Tolt Reservoir's latest daily level (Oct 25, 2026) is 1,719.77 (NGVD29) ft.

Over the past 7 days the lake has been falling (−2.72 ft), and it is −8.36 ft over 30 days.

Compared with a year ago (1,723.59 ft, same time of day), the lake is 3.82 ft lower.

Readings come from the USGS gauge “SOUTH FORK TOLT RESERVOIR NEAR CARNATION, WA”. Gauge elevations are not directly comparable between lakes because each uses its own datum.

Lake facts

Gauge / station	SOUTH FORK TOLT RESERVOIR NEAR CARNATION, WA
Elevation datum	ft (NGVD29)
Gauge location	47.6937, -121.6890

Nearby lakes

Spada Lake19 mi N1,400.16 ft−3.32 ft Sammamish Lake21 mi W25.94 ft−0.01 ft Howard A Hanson Reservoir29 mi S1,122.17 ft−7.31 ft Keechelus Lake30 mi SE2,432.74 ft−0.58 ft Kachess Lake37 mi SE2,213.55 ft−0.91 ft

Common questions

Is South Fork Tolt Reservoir rising or falling?

Over the last 7 days it changed −2.72 ft and over 30 days −8.36 ft.

How full is South Fork Tolt 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.