Does 'wildness' which has occurred in the Wilderness mean that it's time to portage around the log jam and keep on boating? Yes. If man intervened every time the Wilderness got a little too wild, then it wouldn't be Wilderness would it.
In 1964 our nation's leaders formally acknowledged the immediate and lasting benefits of wild places to the human spirit and fabric of our nation. That year, in a nearly unanimous vote, Congress enacted landmark legislation that permanently protected some of the most natural and undisturbed places in America. The Wilderness Act of 1964 established the National Wilderness Preservation System, the system of all America's wilderness areas, to "secure for the American people of present and future generations the benefits of an enduring resource of wilderness."
The United States was the first country in the world to define and designate wilderness areas through law. Subsequently, countries around the world have protected areas modeled after the Wilderness Act. Wilderness is part of our history and heritage and is passed as a legacy to future generations. Indispensable to the American past, the legacy that is wilderness will remain indispensable to the American future.
"...lands designated for preservation and protection in their natural condition..." Section 2(a)
"...an area where the earth and its community of life are untrammeled by man..." Section 2(c)
"...an area of undeveloped Federal land retaining its primeval character and influence, without permanent improvement or human habitation..." Section 2(c)
"...generally appears to have been affected primarily by the forces of nature, with the imprint of man's work substantially unnoticeable..." Section 2(c)
"...has outstanding opportunities for solitude or a primitive and unconfined type of recreation..." Section 2(c)