The Dalles Riverfront Trail Committee presented City Councilors with a plan to complete the final section of the ten-mile long pedestrian and bicycle connection between the Columbia Gorge Discovery Center and The Dalles Dam, but it comes with a hefty price tag.  Committee chair Dan Durow says the plan involves either constructing a pedestrian bridge over Interstate 84 near Brewery Grade or attaching a cantilever addition to the existing bridge at that location, which puts the estimated cost of the section at $7,000,000.  The committee currently has $1,200,000 in Oregon Department of Transportation grant funds available, so Durow says trail construction would have to take place in stages, and fundraising and grant applications would be needed to generate the rest of the money.  Original plans to keep the entire trail on the north side of Interstate 84 were scuttled when the Yakama Nation raised cultural and fishing site access concerns.  City Councilors have to approve the plan, and will discuss it at their May 8 meeting.