"Longfellow Creek". > Drainage & Sewer System. Seattle Public Utilities. n.d. Archived from the original on 2006-03-19. Retrieved 2006-04-21. Includes an overview and a sketch map.
"Longfellow Creek". > Drainage & Sewer System. Seattle Public Utilities. n.d. Archived from the original on 2006-03-19. Retrieved 2006-04-21. Includes an overview and a sketch map.