The Cowlitz people were separated into the Upper ( or Taidnapam ) and Lower ( or Mountain ) Cowlitz tribes respectively .
Cowlitz tribes were members of the Sahaptin and Salish language families .
The Cowlitz people were separated into the Upper ( or Taidnapam ) and Lower ( or Mountain ) Cowlitz tribes , who were members of the Sahaptin and Salish language families , respectively .