Those would be the jade tees. The diagrams are misleading, if you look at the actual course pics you can see the fairway starts beyond the jade tees, that box is behind the fairway up on a little rise that gives the ladies a straight shot towards the hazard. It may not be 250 but it's further than 200, there's some space between that box and the fairway. They don't maintain the area left of the tees like pics show, it's more overgrown than that now. You can see new construction along the fairway and that course has been there several years now. Just tee boxes in the middle of native grass and marshy stuff until you get to the silver tees, I'm sure due to conservation. That course is really fun to play, $19 twilight on Golf Now. Even from the gold tees it's pretty brutal. If you ever get out to Denver put that one on your list. It was once a private club that went public.
I wonder how many OB balls could be avoided by people playing the wrong tees? I hit OB balls somewhat often but nothing like the guys I see swinging out of their shoes from the tips. Even when they're not OB a lot of searching for errant balls takes up their time.