You can even do without that, but, if the intent is to get to the destination,
why go upslope when you can get there Downslope?
Although the last major eruption was in 1995-1996, a breach in the wall of Crater Lake in March 2007 caused a lahar which dispersed around 1.4 million cubic metres of mud,
rock and water Downslope via a river channel,
and in September 2007 there was a sudden hydrothermal(steam-driven) eruption.