Green River (North Fork Toutle River tributary)

The Green River is the largest tributary of the North Fork Toutle River in the U.S. state of Washington. Situated near Mount St. Helens in the Cascade Range in the southern part of the state, it flows generally west through Mount St. Helens National Volcanic Monument and industrial timberlands for 37.4 miles (60.2 km). The river drains more than 130 square miles (340 km²) in parts of three Washington counties: Skamania, Lewis, and Cowlitz.

Green River
Location
Country	United States
State	Washington
Counties	Lewis, Skamania, Cowlitz
Physical characteristics
Source	Near Spirit Lake
• location	Gifford Pinchot National Forest, Lewis County
• coordinates	46°18′02″N 122°05′33″W
• elevation	4,765 ft (1,452 m)
Mouth	North Fork Toutle River
• location	Toutle, Cowlitz County
• coordinates	46°22′22″N 122°34′57″W
• elevation	741 ft (226 m)
Length	37.4 mi (60.2 km)
Basin size	131 sq mi (340 km2)
Discharge
• location	near Kid Valley
• average	479 cu ft/s (13.6 m3/s)
• minimum	34.2 cu ft/s (0.97 m3/s)
• maximum	14,500 cu ft/s (410 m3/s)

As with most other parts of the Toutle River and Cowlitz River systems, the upper part of the Green River was heavily affected by the 1980 eruption of Mount St. Helens.

Course

It rises from snowmelt on the opposite side of a ridge from Spirit Lake, in the Gifford Pinchot National Forest in Skamania County. The river initially flows north, but turns northwest after the confluence with Grizzly Creek. Turning west, it crosses into Lewis County, then back south into Skamania, and almost immediately afterwards flows into Cowlitz County. Shultz Creek enters from the left then Devils Creek from the right. The river empties into the North Fork Toutle River near the unincorporated community of Toutle.