The trail is definitely tough, but doable. And because it is "closed to the public" there are three fences/gates that you need to navigate through. It took us 3 1/2 hours to go both ways. And coming down is challenging too, as it is steep. The views at the top are worth the effort though, with great views to the west out to Pt. Loma, south to Otay Lakes and mountains to the east.
The fact they have closed the trail to the public, is a shame. Here is the official reason given by the U.S. Fish and Wildlife Service http://bit.ly/2gP2zWF
Considering the adjoining Sweetwater River Trail has figured out a way to accommodate hikers, I would think the we could figure out a way to do it here too. And after all, it was our tax dollars that allowed this land to be acquired in the first place.
This is right by my home. There were at least a dozen people out there at 6pm. Doesn't say closed out there. I went alone but I recommend a partner. Some areas were hard but not terrible. I'm not young or in perfect shape. It was a great work out. Don't expect to be clean when you're done!
Mabel P. on Sweetwater Trail
Very fun ride!