Crossword puzzle clue "river in houseboy"

River in "houseboy"?

___ River (after translation, "Crooked River River")

Skunk River city established to serve the Cedar Rapids and Missouri River Railroad

River whose name is Celtic for "river"

Costar of "Red River" and "The Siege at Red River"

Central German river that you should obviously know because it's a tributary of the one, the only Fulda River!!!

___ River (northwest California river, doubtful if it has any)

River whose name means "river"