(Undated)  --  The latest ParkScore Index ranks Portland fifth in the country in relation to its park system.  According to the index, compiled by the Trust for Public Land, Portland earns four-and-a-half "park benches" on a scale of zero to five.  ParkScores are based on factors that include park access, park size, and facilities.  Minneapolis ranks first, followed by St. Paul, San Francisco, and Washington, DC.  Seattle is ranked 11th.