The tortuously slow pace and increasingly expensive price to replace the Interstate 5 bridge across the Columbia River have some Oregon and Washington lawmakers growing uneasy and frustrated. Project planners had estimated the price tag for replacing the bridge would range from $5 billion to $7.5 billion, with a likely figure of around $6 billion. Meeting last Monday for the first time in 10 months, several didn’t hide their pique as they pressed the administrator of the Interstate Bridge Replacement Program for answers. Supporters of the project predict fewer crashes, faster commutes and more transit options when the new bridge is done. A final environmental review for the project was supposed to conclude this year, Oregon state Sen. Khanh Phạm, D-Portland, told the committee.