Johnston Street Boat Ramp is located in Mosman Park on the Swan River, offering convenient access to the water alongside scenic river views.

The ramp provides a straightforward launch point for recreational boaters, though it comes with some practical limitations to keep in mind. Parking for vehicles and trailers is quite limited at this site, and there is no jetty available for mooring.

After launching, boats must be pulled up on the sand beside the ramp rather than tied to a dock. While the setting is attractive, boaters seeking more comprehensive facilities may want to consider other Swan River ramps in the metropolitan area.