Thursday's letters: City must take action on rogue bike trails

Re. “Unapproved mountain bike trails spark concerns,” Sept. 10
I was pleased to read this article drawing attention to a significant threat to the integrity of the river valley system: the extent and proliferation of unauthorized trails.
Almost all steep slopes and undulating terrain of the ravines and river valley have them. They cause erosion, compaction of soil, loss of vegetation and habitat for wildlife.
My observation is they are created by young, thrill-seeking males who enjoy