Green River Soda Spring

Lewis County, Washington · Near Morton
46.3780°N, 122.2650°W · 1,644 ft
86°F 50°F air · Good soaking weather 1,644 ft Roadside Camping nearby (13.7 mi)
Aerial view of the ground around Green River Soda Spring LiDAR bare-earth view of the same ground around Green River Soda Spring
Aerial LiDAR bare earth

Drag the handle to compare the two views. The orange dot marks the spring, in a frame about three quarters of a mile wide.

Green River Soda Spring is a mineral spring in Lewis County, Washington, a dozen miles or so from Morton. The name says soda spring, the old term for naturally carbonated water. No chemistry sits in the record to confirm it. What is on file is a temperature in the high eighties, warm to the touch and too cool for a real hot soak, and a location a stone's throw from pavement. Ownership and access are blank.

Location

This one is close to the road, a little over a hundred feet by the record, though the road itself goes unnamed in the record. Low elevation for the Cascade foothills. Wet country, with seventy-five inches of rain a year and a similar figure for snow, so the cold months bring real accumulation even this low down.

Winter is the season the record prefers. Iron Creek Campground, close to fourteen miles off, is the camping option on record. The water is only warm, so there is no burn risk, and there is also no mention of a pool, a fee, an owner, or permission to visit. Treat it as a dot on the map until you can confirm what is there.

Terrain

Aircraft with laser scanners measured this ground to within inches. The scan strips out trees and buildings, leaving the bare shape of the land around Green River Soda Spring.

Setting
Hillside
The spring sits on a steep slope that climbs to the north.
Highest ground nearby
516 ft above the spring
Within a quarter mile, to the north
Cross-section through the spring

A slice through the ground from north to south, about 0.6 miles end to end.

Elevation data: USGS 3D Elevation Program. Aerial imagery: USGS The National Map. Public domain.

Heat Below
95 milliwatts per square meter of heat flow

That's about 1½ times the US average of 65. It's higher than at 40% of the springs on this site.

Heat flow measures the warmth working its way up through the ground from deep inside the earth. Where it runs high, rain and snowmelt that seep down through cracks in the rock come back up hot.

Heat flow estimate: Stanford Thermal Earth Model (Aljubran & Horne, 2024), CC BY 4.0.

Monthly Climate
37°
Jan
36°
Feb
40°
Mar
45°
Apr
52°
May
57°
Jun
63°
Jul
65°
Aug
59°
Sep
50°
Oct
41°
Nov
36°
Dec
Annual Precip: 74.8 in Annual Snow: 74.5 in
Best Time to Visit
February Air 36°F · Water 86°F · +50° contrast
December Air 36°F · Water 86°F · +50° contrast
January Air 37°F · Water 86°F · +49° contrast
February offers 29°F more contrast than August
Current Conditions
50°F
E 0.0 mph 100% Good soaking weather
Tuesday 56° Low 47° Mostly Cloudy 11% precip
Spring is +30° warmer
Wednesday 67° Low 47° Sunny
Spring is +19° warmer
Thursday 69° Low 52° Sunny
Spring is +17° warmer
Friday 67° Low 52° Sunny
Spring is +19° warmer
Saturday 69° Low 52° Mostly Sunny
Spring is +17° warmer
Where to Stay

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Nearby Camping
Iron Creek Campground 13.7 mi away

Overview Iron Creek Campground sits near the confluence of Iron Creek and the Cispus River. This large campground winds through a forest of old-growth Douglas firs, cedars and hemlock. Lush vegetation and ample space between sites offers excellent privacy. Recreation Iron Creek provides great fishing for cutthroat trout, whitefish and rainbow trout. Visitors can stroll along the .3-mile Iron Creek Old Growth Trail and weave through the forest and along the Cispus River, or continue on a long...

Fee Extra Vehicle Fee $8.00
Reservable Yes
Reserve on Recreation.gov →
Temperature
86°F
Warm Hot Boiling
Water Temp 86°F (30°C)
Avg Air Temp 49°F
Above Ambient +38°F
Mild soaking conditions September
Access
Road Access Roadside
Distance to Road 137 ft
Frequently Asked Questions
What is the water temperature at Green River Soda Spring?
Green River Soda Spring has a water temperature of 86°F (30°C). This is a warm thermal spring.
Where is Green River Soda Spring located?
Green River Soda Spring is located in Lewis County, Washington at 1,644 feet elevation, near Morton. Coordinates: 46.3780°N, 122.2650°W.
How do I get to Green River Soda Spring?
Green River Soda Spring has Roadside road access (137 ft from the road).
Can I camp near Green River Soda Spring?
Yes, Iron Creek Campground is located nearby (13.7 miles away). Extra Vehicle Fee $8.00.
Sources: Wikipedia