Jake,
Yes, the proposal is that it crosses at-grade across Clifton.
If indeed a 30 ft. flat section is needed for crossing at Clifton, it would require a ~3ft vertical regrading, which could could be spread out a long distance up the hill before the crossing.
If a 30 ft. flat section is needed for crossing at Clifton, it would require a ~2ft vertical regrading that could easily be accomodated with the pending demolition of the elementary, which could offer more space to work with.