Gadzira shanduro yakaoma zvikuru yemutsara uyu Kambani yakavambwa muna 1889 seWashington Water Power Company.
Chokwadika, shanduro yakaoma kunzwisisa zvikuru yemutsara wacho ndeiyi "Kambani yakavambwa muna 1889 seWashington Water Power Company, kusvikira bhodhi revatungamiriri rabvumidza chinjo yezita kuAvista Corporation, inoshanda January 1, 1999".