WA has a program called Running Start that allows for juniors and seniors to attend college instead of high school.

http://www.k12.wa.us/SecondaryEducation/CareerCollegeReadiness/RunningStart.aspx

There are also two programs at UW for early entrants.

https://depts.washington.edu/cscy/programs/

The Early Entrance Program seems like a good program that addresses some of the concerns raised here.