The west side sidewalk is only 36″ in places while the rest of the sidewalk is 48″. The west side could be made usable with proper maintance. The lack of maintenance of the walkway, the un-trimmed shrubbery along the path, soil sliding on to the walkway, all contribute to a narrowed walkway, sometimes less than 18″, and containing loose material that is a trip and slip hazard for many of the sidewalk users.
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Good Guideline for Sidewalk Design
This article on Sidewalk Design Criteria has good information: http://epg.modot.org/index.php/642.1_Sidewalk_Design_Criteria