The University of California Berkeley is the single highest ranked public university according to U.S. News and is one of the highest ranked schools in the entire country, public or private. This is the ultimate "Public Ivy" and serves not only as the flagship for California's state university system, but is the defacto flagship public university of the United States.
U.S. News Ranking: #1
In State 30 Year Net ROI: $1.18 Million
Out of State 30 Year Net ROI: $1.09 Million