A group of Brunswick-area residents wants to make it easier for fish to get up the Androscoggin River, but there’s a dam in the way. Federal regulators and dam owners are about a year into the five-year process of relicensing the 50-year-old hydroelectric dam that spans the Androscoggin River between Brunswick and Topsham. Local environmentalists say it’s a once-in-a-lifetime opportunity to evaluate and redesign passageways that have failed to allow fish migration. “(Fish are) trying, but they’re not getting above the dam,” Spies said. It contributes about 90,000 megawatt hours of hydroelectric power to the Central Maine Power grid annually.