Trail 239 down APE CAVE. lava tube is lower longest. Between Swift Creek Reservoir & S tip of Mt St Helens Park. St Rd 503 & Nat Forest Rd Closest town is Cougar, WA. Upper Cave is more challenging, but it has a skylite, and is not a dead end.
National Geographic photographer Reid Blackburn’s car after the eruption of Mount St. Helens, May The lava would have been about when it reached him. In all, the eruption equaled Hiroshima-sized atomic bombs.