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Heh! - I didn't realise that the hotspot trail could be traced that far away i.e. to the Cascades.
Even larger eruptions have occurred in the distant past. The Deccan Traps eruption, which was contemporary with the Cretaceous–Tertiary extinction event erupted approx 1000000 km3 of magma and the Siberian Traps eruption, which was coincident with the Permian extinction where an estimated 90% of all life on Earth was killed, erupted up to 4000000 km3 of magma.
My research leads me to believe that the next (4th) caldera cycle has already started- which is something I hope to see published in the not too distant future.