American West Steamboat Company
Sternwheeler cruises along the Columbia, Willamette, and Snake rivers.
www.columbiarivercruise.com/   reviews

Maid of the Mist
offers steamboat tours of Niagara Falls.
www.maidofthemist.com/   reviews

Mobile Steamboat Company
Offers riverboat cruises in an authentic sternwheeler.
www.mobilesteamboat.com/   reviews