Well, South Eugene is an anomaly.   It is way higher than other local high schools.   The overall 2015 high school graduation rate for the entire Eugene School District was only 74%   So other Eugene high schools did far worse. 

South Eugene is an affluent area.  The parents are rich, and tend to be more intelligent and educated themselves.   They tend to have more intact families where the kids have both a mother and a father living with them.  These parents are probably stressing the importance of an education to their kids too.   And they are probably getting their kids into more wholesome activities than playing video games or skateboarding.

The Springfield School District is an even less affluent area.   And its overall graduation rate was only 66%.   So a third of the students failed to graduate.

If parental involvement is key to the success of children in school, then one does have to wonder how much the schools themselves can do to improve things.