Length: 3.50 miles
Loop Trail? No
Allowed Uses: Dogs - On leash
Pedestrian - Walking/Hiking/Running
Agency: USDA Forest Service
Entry Fee? No
Parking Fee? No
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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.
Latitude: 46.1069 Longitude: -122.21217
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
Width: 60 inches.
Primary Surface: Not Available
Secondary Surface: None
Average Grade: 0%
Elevation Low Point: Not Available
Elevation High Point: Not Available
Year Designated: 1986
Supporting Webpages and DocumentsWebsite: USDA Forest Service - trail 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.
Gifford Pinchot National Forest
Mount St. Helens NUM
42218 NE Yale Bridge Rd.
Amboy , WA 98601
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