County supervisors last week approved plans to reconfigure a 120-foot box culvert set in Woodacre Creek that runs under Railroad Avenue, hoping to ease passage for juvenile coho salmon and steelhead trout seeking the sea. Last year, the county secured a $235,000 grant from the California Department of Fish and Wildlife to outfit the culvert, which has strangled water flows in sections of the creek and washed out sediment since its construction around 50 years…