Sathiya Kannan, a Girl Scout from Reston, will be repairing one of the bridges on the Mount Vernon Trail in Alexandria on Saturday, March 25, as a Silver Award Project for scouting. Kannan, who goes to school in Herndon, is part of a team of National Park Service volunteers that day that will be working on the bridge from 10 a.m.-4 p.m. near the Belle-Haven parking lot. Additional volunteers are needed and park rangers will be on site to provide materials, tools and training. Light refreshments and water will be available. Teens can earn service hours, ages 10 and up. Email firstname.lastname@example.org for more information and to register.