These come out of the Oregon Fire Code Book. If this doesn’t fully answer your question, please contact our Fire Prevention Office through our website HERE.
Oregon Fire Code 508.5.4 (Obstruction)
Posts, fences, vehicles, growth, trash, storage and other materials or objects shall not be placed or kept near fire hydrants, fire department inlet connections or fire protection system control valves in a manner that would prevent such equipment or fire hydrants from being immediately discernible. The fire department shall not be deterred or hindered from gaining immediate access to fire protection equipment or fire hydrants.