Canada
United States
Belgium
France
Ireland
Netherlands
United Kingdom
Austria
Czechia
Germany
Poland
Slovenia
Switzerland
Italy
Spain
Türkiye
Denmark
Finland
Norway
SwedenCastle Lake near Mount St. Helens water level
Lake, Castle Lake, Washington, United States
Right now
Latest reading
Surface elevation
History
What this means
The U.S. Geological Survey reports Castle Lake near Mount St. Helens at 2,577.71 ft. There is no published reference for this lake yet, so we can't say whether that is high or low for the season.
It has barely moved over the past 24 hours. The 30-day range is 2,577.69 ft – 2,577.72 ft.
The agency publishes no normal range for this gauge yet, so we show the trend only. How to read levels
Boating and fishing at Castle Lake near Mount St. Helens
Use the recent trend to judge conditions. A fast rise or fall shows up at docks and beaches within days.
Conditions at the shore change with the level, so check with the agency that runs the lake before a trip.
Weather at the gauge
No rain in the last 3 days.
Forecast: Open-Meteo
Map
Nearby gauges
| Gauge | Level | Compared with normal | 24 hours | Distance |
|---|---|---|---|---|
| Swift Reservoir 3.2 Mi East of Dam near CougarReservoir, Swift Reservoir 3.2 Mi East of Dam | 958.00 ft | Normal | −1.00 ft | 15 mi |
| Yale Reservoir near CougarReservoir, Yale Reservoir | 473.00 ft | Normal | ±0 | 16 mi |
| Cowlitz River near KosmosRiver gauge, Cowlitz River | 471 cfs | Very low | +44.0 cfs | 17 mi |
| Nf Toutle River below Srs near Kid ValleyRiver gauge, Nf Toutle River | 154 cfs | Very low | +14.0 cfs | 17 mi |
| Speelyai Creek near CougarRiver gauge, Speelyai Creek | 1.4 cfs | Very low | −0.1 cfs | 18 mi |
| Muddy River below Clear Creek near CougarRiver gauge, Muddy River | 13.76 ft | Very low | ±0 | 18 mi |
| Lewis River above Muddy River near CougarRiver gauge, Lewis River | 161 cfs | Very low | −3.0 cfs | 19 mi |
| Lake Merwin near ChelatchieLake, Lake Merwin | 229.00 ft | Very low | ±0 | 20 mi |
Questions and answers
Is Castle Lake near Mount St. Helens really 2,577.71 ft deep?
No. 2,577.71 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 Castle Lake near Mount St. Helens today?
On Oct 19, 2026, 12:45 PM PDT, the surface elevation was 2,577.71 ft. Steady over the last 24 hours.
Is Castle Lake near Mount St. Helens rising or falling?
Steady over the last 24 hours.
Is the level of Castle Lake near Mount St. Helens normal?
The agency publishes no normal range for this gauge yet, so we show the trend only.
How often is this data updated?
The U.S. Geological Survey publishes a new reading every 15 minutes. This page refreshes within minutes of each update.
Where does this data come from?
The values come directly from the U.S. Geological Survey, the official operator of this gauge, and are in the public domain. We do not estimate or model live values.
For specialists
Station codes, datum, parameters, data quality and downloads
- Operator
- U.S. Geological Survey
- Station code
usgs:14240446(Agency page)- Coordinates
46.25639, -122.27444(WGS84)- Vertical datum
- NGVD29
- Update interval
- every 15 minutes
- Licence
- Public domain. Data: U.S. Geological Survey (USGS), provisional data subject to revision
Published series
| Parameter | Last value | Time (UTC) | Quality |
|---|---|---|---|
| Surface elevation | 2,577.71 ft | 2026-10-19 19:45 | Provisional |
Download
Embed this gauge
Add a live card for this gauge to your website. It updates on its own and links back here.
How to cite
U.S. Geological Survey: Castle Lake near Mount St. Helens (usgs:14240446). Accessed October 19, 2026 via Nivelmap, https://nivelmap.com/en/united-states/washington/castle-lake-near-mount-st-helens
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.
Readings are provisional, can be delayed or wrong and are not a flood warning. Read the disclaimer