Ape Cave Trail No. 239

photo: Ape Caves lava tube. Photo by Courtesy flickr.com.

Length: 3.50 miles
Loop Trail? No
Type: Backcountry
Agency: USDA Forest Service
Entry Fee? No
Parking Fee? No

Allowed Uses:

Dogs - On leash
Pedestrian - Walking/Hiking/Running

See more details.


Location: In the Gifford Pinchot NF, just N of Lava Tubes above the Swift Reservoir Dam. Access from I-5 on SR 503, Co. Rd. 17, and FS Rds. 90, 83, and 8303.
State(s): Washington
Counties: Skamania
Longitude: -122.21217
Latitude: 46.1069

Driving Directions

From Cougar travel east on SR5035 for 7 miles, turn north on FR83 for 2 miles, turn west on FR8303 1.5 miles to Ape Cave.


Receives 170,000 visitors annually. The longest intact lava tube in continental US, with interpretative signs about formation, unique features and fragile life within a lava tube. Two main exploration routes - lower trail w/ lava 'ball', upper=challenging

Additional Details

Width: 60 inches.
Primary Surface: Not Available
Secondary Surface: None
Elevation Low Point: Not Available
Elevation High Point: Not Available
Elevation Gain (cumulative): Not Available

Year Designated:

Supporting Webpages and Documents

Website: Trail #239 Ape Cave

Contact Information

For more information and current conditions, contact the trail manager (listed below). For questions, suggestions, and corrections to information listed on the website, contact American Trails.

Jim Nieland
Recreation Planner
Gifford Pinchot National Forest
Mount St. Helens NUM
42218 NE Yale Bridge Rd.
Amboy, WA 98601
(360) 247-3946




Ape Caves lava tube. Photo by Courtesy flickr.com.

Ape Caves lava tube. Photo by Courtesy flickr.com.


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