Na 1850, oke ọhịa redwood ochie kpuchiri ihe karịrị 2,000,000 acres (8,100 km2) nke ụsọ oké osimiri California. Akụkụ ugwu nke mpaghara ahụ, nke ndị Amerịka mbụ bi na ya, dọtara ọtụtụ ndị na-egwupụta osisi na ndị ọzọ ghọrọ ndị na-egwupụta ọla edo mgbe obere ọla edo na-eweta ha na mpaghara ahụ. Na mgbalị ha na-akụ akụ na ọla edo, ndị ikom a tụgharịrị na-egbu osisi ndị ahụ buru ibu maka mmepe na-aga n'ihu na San Francisco na ebe ndị ọzọ na West Coast. Mgbe ọtụtụ iri afọ nke ịcha osisi na-enweghị mgbochi, mgbalị siri ike maka nchekwa malitere. Site na 1920s ọrụ nke Save the Redwoods League, nke e hiwere na 1918 iji chekwaa osisi redwood ochie ndị fọdụrụnụ, rụpụtara na nguzobe nke Prairie Creek, Del Norte Coast, Jedediah Redwoods na Redwoods Smith State Parks.
2,000,000 acres