The contribution to Portland for which he is most remembered today is the platting of his land claim in Northwest Portland, which stretched from Burnside Avenue north for 1 mile (1.6 km), between Northwest 23rd Avenue and the Willamette River. In laying out the streets, Couch named the east-west thoroughfares in alphabetical order as A Street, B Street, etc. The streets were later renamed, retaining the alphabetic ordering, with "C Street" renamed "Couch Street" in his honor. "F Street" was named in honor of his business partner Flanders. Couch Park in the district is also named for him. The park was formerly the estate of Cicero Hunt Lewis, who married Couch's daughter Clementine. The area has become known more recently as the Alphabet District.