NCC have temporarily closed a short section of the Lime Kilns Blue Loop at the southern part between 18BA and 18BB. See the linked NCC trail closure website. https://ncc-ccn.gc.ca/closures/partial-closure-of-the-lime-kiln-trail-in-the-greenbelt-until-further-notice#:~:text=There%20will%20be%20a%20partial,closure%20of%20the%20trail%20segment.There is no indication of when this section of trail will open at this time.