To help keep Highway 37 open despite heavy storms and rising tides, planners are assessing a wide range of options from elevating the road to rerouting it. But zeroing in on the right redesign may be trickier than anticipated. New research shows that, with sea level rise, protections for this troubled North Bay road can worsen flooding and economic damages as far away as the South Bay. The good news is that this work can also identify Highway 37 redesigns that avoid these catastrophic impacts.