smoke stacks in Jurupa Valley

I live on Corte Castillo in Jurupa Valley. At the end of the street is a trail. The trail leads to 2 formations that look like smoke stacks. There is structure that resembles a large swimming pool. There is an old cell tower. Further on is a reservoir with small fish and water life. We are extremely curious about what was once there. We've asked long time residents and they have no answers. Please help inform us!

Floor Plans of the Mission Inn and Catacombs

Here are a set of plans from The Mission Inn in 1985. What matches to the Inn after the remodel, I do not know. Last time I was on the property was 1985. Going to go back there someday. Maybe this year if work allows.
I worked with Cal Poly, Pomona architecture students on the buildings of the Mission Inn.  I am even formally thanked in the acknowledgements, in the book they published on the Inn.

New Years Eve at the Gourmet Detective

New Year’s Eve Shows

New Year's Special -- $95 Per Person
If it's comedy, interaction, dinner, champagne and maybe even a little drama you want, then Gourmet Detective is just the place to spend New Year's Eve. We start the evening off innocently enough with dinner and a show, but once the murder has been solved party favors, music, and a champagne toast await as we ring in the new year.

The Avila Terrace Theater, 3663 Main Street, Riverside, 92501

Price Includes
Three course dinner, with your choice of 4 special entrees
The award winning show
Party favors