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PORTLAND — Seven years after the start of planning, the height of a proposed Columbia River Crossing is still up in the air as planners face a permit deadline for the new Interstate 5 toll bridge between Portland and Vancouver. Engineers are redesigning the bridge to increase the clearance for ship and barge traffic.Changing the height affects other aspects of construction such as highway grades, size of onramps, and even flight plans for Vancouver’s Pearson Field. In addition, construction costs increase with the height of the bridge.Planners must settle on a height before the Jan. 30 deadline to file the permit application with the Coast Guard, The Oregonian reported Tuesday.In March, after $140 million had been spent during seven years of planning, the Coast Guard said the proposed 95-foot clearance was too low and would block some ships or loads carried on barges.The Coast Guard must approve the height of bridges on navigable waterways. Planners have been analyzing possible bridge clearances, calculating effects and costs at each increment. They’re narrowing in on a decision of 115 or 116 feet, the newspaper said.