Cooper River Trail #1311

The trail begins at the Salmon La Sac Trailhead and travels along the river to Forest Road 4616 near Cooper Lake.

Setting: River valley, old-growth forest.

Though generally a gentle grade, this trail has many up and downhill stretches as it runs through the oldgrowth forest along the river. This trail is a good day hike especially with road access at either end.

At a Glance

Operational Hours: May - October
Fees: $5/vehicle/day or Northwest Forest Pass, or Federal Interagency Recreation Pass required at Salmon La Sac trailhead.
Usage: Medium
Best Season: Summer
Busiest Season: Summer
Restrictions: Motorized use prohibited.
Closest Towns: Cle Elum, Roslyn
Restroom: Yes

General Information


From Cle Elum and/or Roslyn, take State Highway 903 north to Salmon La Sac, then turn left on Forest Road 4316 and take spur Road 111 to the Salmon La Sac Trailhead. This is also the trailhead for Waptus River Trail 1310 and Polallie Ridge Trail 1309.


Parking, toilets, hitch rails, and stock ramps at the Salmon La Sac trailhead.


Mountain Biking

This trail has many short ups and downs but is generally rideable.  A loop can be formed with the Cooper River Road, FS Road 46 to FS Road 4616, by riding upstream on the road and downstream on the trail.

Difficulty Level: Intermediate

Day Hiking

View big trees and a tumbling river along this easy trail.

Difficulty Level: Easy


Mostly a dayhike, this trail can be combined with Pete Lake Trail #1323, Waptus Pass #1329, and either Waptus River #1310 or Polallie Ridge #1309 for a multiday loop.

Difficulty Level: Easy

Horse Riding

A good easy dayride for newer riders with camping available at nearby Cayuse Horsecamp. 

Difficulty Level: Easy

Related Information

Recreation Areas

Recreation Activities


  Area/Length : 
3.9 miles

  Elevation : 
2500 feet. - 2800 feet.