Elevation Gain
400.00 ft (121.92 m)
Trail type
11.00 mi (17.70 km)
Warming hut
Please respect the outdoors by practicing Leave No Trace. Learn more about how to apply the principles of Leave No Trace on your next outdoor adventure here.

Although this snowshoe and cross-country ski route's name suggests otherwise, the Cooper River Trail showcases the surrounding mossy, old-growth fir forests more than rivers. Provided you stay on course, the trail rolls gently along an occasionally steep valley wall and dips into small gulches. Taking your time to stay on the path really pays off, and it can greatly increase the likelihood that you will spot some of the abundant wildlife in the area.

The route departs from a winter turn-around area at the end of SR 903 N, which is also the entrance to the Salmon La Sac Sno-Park, a popular area among snowmobilers.  The initial 1.5 miles to the official Cooper Lake Trailhead is a well-signed, fairly flat trek along the edges of private property. Start by passing the Forest Service Station, then continue across a bridge over the Cle Elum River to the head of the Cooper River Valley. After traveling a short distance up the trail, you will pass high above the river and get a brief view of Red Mountain standing tall across the mouth of the valley. Wide trees and steep slopes form the scenery for the next 2.5 miles before the trail provides more level footing by dropping down near the river bank. The Cooper River headwaters soon become evident where Forest Road 4616 crosses a bridge over the Cooper Lake outlet. 

If you have the time, travel the extra 0.1 mile up the road to the Lake Shore Trail. Although snowmobiles can often be heard about the hills in the lake area, the north shore boasts perfect picnic accommodations and picturesque scenery toward Cooper Pass to the west.   

Note: Always check weather and avalanche conditions before traveling in the backcountry in the winter.

Recommended Gear

Before you head out on your next Mount Hood adventure, make sure you have the right gear! 

Here's a list of our go-to snowshoeing essentials to get you started:

Snowshoes: MSR Lightning Ascent Snowshoe

Cushioned, Made in USA, Ultralight, 98.8 oz

Men's • $299.95 • MSR | Amazon | Backcountry | REI

Women's • $299.95 • MSR | Amazon | Backcountry | REI

Jacket/Shell: Arc'teryx Zeta AR Jacket

Waterproof, Adjustable Drawcord Hem, Pit Zips, GORE-TEX

Men's • $431-475 • Arc'teryx | Amazon | Backcountry

Women's • $475 • Arc'teryx | Amazon | Backcountry

Pack: Mammut Nirvana Pro Pack 

35L, Carry-On Size, Hip Belt, Ice Axe / Pole Loops, Hydration Compatible

Standard Fit • $189.95-199.95 • Mammut | Amazon | Backcountry

Small Fit • $199.95 • Mammut | Amazon

Insulating Layer: Moosejaw Dequindre Down Jacket

Water-resistant, Insulated, Adjustable Drawcord Hem

Men's and Women's • $179

Poles: Black Diamond Traverse Pole 

Aluminum, Adjustable with Lever Lock System, 21 oz.

$79.95 • Black Diamond | Amazon | Backcountry | REI

Gloves: The North Face GORE-TEX Gloves

Waterproof, Adjustable, Insulated, GORE-TEX

Men's • $99.95-181.63 • The North Face | Amazon | Backcountry

Women's • $99.95-100.00 • The North Face | Backcountry

Boots: Vasque Snowblime UltraDry Boot

Waterproof, Cushioned, Insulated

Men's • $149.99 • Vasque | Amazon | Backcountry

Women's • $149.99 • Vasque | Amazon | Backcountry

Gaiters: Outdoor Research Verglas Gaiter 

Waterproof, Breathable, Lightweight, Abrasion-resistant

Men's • $41.32-65 • Outdoor Research | Amazon | Backcountry | REI

Women's • $49.95-65 • Outdoor Research | Amazon | Backcountry | REI

Logistics + Planning

Preferable season(s)




Parking Pass

NW Forest Pass


Old-growth forest. Scenic rivers. Frozen lake.


Noisy snowmobile recreation areas nearby.

Pets allowed


Trailhead Elevation

2,413.00 ft (735.48 m)


Big vistas
Old-growth forest
Cross-country skiing

Typically multi-day


Groomed trail



Nearby Adventures

Alpine Lakes Wilderness, Washington
Alpine Lakes Wilderness, Washington
Okanogan-Wenatchee National Forest

Nearby Lodging + Camping

Alpine Lakes Wilderness, Washington
Alpine Lakes Wilderness, Washington
Alpine Lakes Wilderness, Washington


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