This hike on trails near Seneca Creek starts at the Schaeffer Farms Trailhead in Germantown, then proceeds down to the Black Rock Mill. From there, we will hike north on the Seneca Greenway Trail to Riffleford Road, then we will come back on the Seneca Ridge Trail. The trails are fairly flat with some moderate hills. Despite the very long distance, the total ascent will only be about 1200 feet, but the largest uphill section is at the end of…