Ray (webmaster) on 3/4/2020 5:38:39 AM:
Here's the MO State Parks web page with restroom info:
https://mostateparks.com/advisory/83486/some-modern-restrooms-winterized-katy-trail-state-park
Looks like the scheduled opening date is April 1.
Note that, as per the above web page, most of the restrooms use "vault toilets" or portable (i.e. Johhny on the spot) which are open year-round.
Only a handful are the "modern" ones that have to be closed for the winter: St Charles, Hartsburg, Rocheport. Plus 5 more are listed as simply "closed": New Franklin, Pilot Grove, Sedalia, Green Ridge, Calhoun