More likely a spearhead than an arrowhead...
That's what I was thinking too. Also, if it were smaller, it would have been the head of an atlatl dart, rather than an arrow. Bows and arrows were much more recent technology.
Yeah. I'd hate to run afoul of the guy who could pull the string on a bow strong enough to shoot an arrow big enough to have a head that size.
Clovis points are spearpoints all. The bow was not used until sometime after those people.