Re: Drive time to Johnston Ridge Observatory from I-5?
You'll want to leave about at least 5 hours total for a trip up there and back, as there are a few places most people want to stop and take photos.
The state operated interpretive center near Seaquest State Park is a pretty good place to stop as well, as it explains very well the area you are visiting.
You can do it in less time than this, but anyone I have met who has tried to do it in less winds up being disappointed with the results.
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