21st Street Southeast in Rich Township, North Dakota

21st Street Southeast in Cass County is a single-lane, unpaved track. It runs in an east-west direction starting from 132nd Avenue Southeast and crosses 133rd Avenue Southeast, 134th Avenue Southeast, 135th Avenue Southeast, 137 Avenue Southeast, 137th Avenue Southeast, 139th Avenue Southeast, 140th Avenue Southeast, 141st Avenue Southeast, 142nd Avenue Southeast and 143rd Avenue Southeast. It connects Rich Township and Lake Township. 21st Street Southeast also exists in Erie Township, Gunkel Township, Gardner Township and Wiser Township.