May Creek Bridge No. 559 is on May Creek Road, approximately 9 miles east of Gold Bar. High winter flows in May Creek caused scour damage around the piers and dropped the streambed approximately 5 feet. During late 2008 / early 2009 the county bridge maintenance crew repaired the south approach, north approach, south abutment, and southeast / southwest / northwest embankments.
On October 16, 2009 County Engineer Owen Carter granted a preauthorization for closure of May Creek Bridge in the event that the bridge needed to be closed in the future due to scour around the footings or bank erosion.
In March of 2011, Snohomish County's Road Maintenance crews stabilized the embankment, which had shown signs of advanced erosion. In the event of future flooding, the banks may continue to destabilize. If this happens, the county will immediately close May Creek Road at the bridge to prevent unsafe traveling conditions. A new bridge is scheduled for the future.