Interestingly enough, I also had Chaetura swifts (two of them) fly across highway 34 in eastern Morgan County yesterday afternoon. At the time I thought it was cool to see Chimney Swifts migrating, then after about a minute I remembered that, despite the warm weather, it was still mid-April. Unfortunately I didn't find any county roads going north to catch up with them, so I never got a better look at them.
Good Birding,
Andy Bankert
Fort Collins