The 100th birthday of the Historic Columbia River Highway was marked with ceremonies on Tuesday at Vista House and Multnomah Falls.  Kristen Stallman of the Oregon Department of Transportation says the route showed how roadbuilding could be done with nature and scenic beauty in mind.  The two-lane highway is now divided into different segments, some of which are accessible only by foot and bicycle.  Only 10 miles of the highway still need to be completed for the entire 73-mile stretch to be totally reconnected.  Two additional miles of the State Trail, between Lindsey and Starvation Creeks, will open this September, and three more miles between Wyeth and Lindsey Creek will open in 2018.  32 to 35 million dollars in funding still needs to be raised to finish the final five miles.