Get ready for an out-and-back route along scenic riverside trails at the Snoqualmie Valley Half, which unfolds here in this small town — Carnation is just 1.1 square miles in size and home to just over 1,700 souls — framed by the foothills of the Cascade Mountains as well as the waters of the Snoqualmie and Tolt Rivers, which meet just to the southwest of the city limits.