Rivers are not fed by steam.
Snake River
The river that feeds into Hoover Dam is the Colorado river.
tributary
The Little Tallahatchie River feeds Sardis Lake in MS.
Nile River
River Drava
Spree and Saale
bob river
The Colorado River feeds Lake Mead.
It's a smaller river that feeds into that river.
The Jordon River.
It is called a tributary.