What a gorgeous day for hiking. And so few people for such a pretty day. What time of year? Some fresh snow but looks like it hasn’t accumulated enough to glissade - or maybe it’s out there but you’re avoiding it…October? From every academic source I can find detailing the 1980 eruption, the South side of the mountain - including where you’re hiking (assume that’s Monitor Ridge) - was essentially spared from the eruption. Some rock and ashfall, sure, but the only Lahar was a relatively small one that flowed down Swift Creek and into the reservoir , which is a half a mile to the East of where you are. But I could be wrong…