Out-and-back route starting and ending at 23rd and P St. NW

• 3 miles:  turn around at the kiosk right at the exit to Conn. Ave.
  
  
• 4 miles:  turn around at the Nat'l Zoo Amazonia Exhibit.
  
  
• 6 miles:  turn right at Covered Bridge past the Nat'l Zoo. Turn around before the tunnel.
  
  
• 7 miles:  turn around at Pierce Mill Rd.
  
  
• 8 miles:  turn around at parking lot after Pierce Mill Rd.
  
  
• 9 miles:  turn around at the Stone Bridge.
  
  
• 11.5 miles:  turn around at the Ranger Station.
  
  
• 13 miles:  turn around at Sherrill Rd. (1st right after Ranger Station).
  
  
• 14 miles:  turn around at Picnic Area 10.
  
  
• 17 miles:  turn around at DC - MD line at barricade.