Poison Lake
Poison Lake is a geothermal spring in Washington. Water at the source is recorded at 122°F (50°C), hot enough to scald.
122°F50°C recorded at the source
Facts
- Coordinates
- 48.9060, -119.4550 (Google Maps, OSM)
- Source temperature
- 122°F (50°C)
- Access
- Unknown
- Type
- Unknown
- Fee
- Not recorded
- Clothing optional
- Not recorded
- Nearest town
- Not recorded
- State
- Washington
- Data sources
- NOAA NCEI. See sources
Map
Larger marker is Poison Lake; smaller markers are other springs within 50 miles.
Quick answers
- How hot is Poison Lake?
- The hottest recorded reading at the source is 122°F (50°C). That is the outlet temperature, not a pool temperature; water cools as it flows away from the source. Water this hot can cause serious burns, so test any pool by hand first.
- Where is Poison Lake?
- Poison Lake is in Washington, at coordinates 48.9060, -119.4550.
- What other hot springs are near Poison Lake?
- The closest listed springs, in straight-line distance, are Hot Lake, 5 mi.
Before you go
- Temperatures are measured at the source and can be far hotter than any soaking pool. Test with a hand before stepping in.
- Access, fees, and road conditions change. Verify with the land manager or owner; "public" here reflects survey records, not a current right of entry.
- Water in natural springs is untreated. Keep your head above water and avoid soaking with open wounds. Some springs carry Naegleria fowleri risk.
- Pack out everything, including soap residue. Many springs have been closed because of trash and overcrowding.
Sources
Dataset last rebuilt October 11, 2026. Not yet checked on site by a person. Access, fee, clothing and closure details appear only when a source below states them. How this data is built.
Merged from
- NOAA NCEI Thermal Springs List (archived 2025): survey location and source temperature, public domain