Could not find a single mention of the Klamath River at the Sempervirens site nor an individual whose bio relates to the Klamath River. Maybe there is mention somewhere I did not look at the site. There are other groups, Tribes, and agencies that focus on the Klamath.
Not slamming the Sempervirens Fund, good and historic organization but nothing to do with Klamath River.
Live on the Klamath River. Has always been my home.
I posted a thread about the Klamath dam removal last month in the Environment and Energy Forum.
The largest US dam-removal effort to date has begun
https://www.democraticunderground.com/1127171833
Made a post in the thread that includes a trip by dugout from Somes Bar (Siskiyou-Humboldt County where the Salmon River joins the Klamath)
Here is a rare treat about the Klamath River and how appeared 100 years ago.
California's Redwood Wonderland - Humboldt County; Thornbury, Sunset Press 1923
The entire book is some kind of wonderful. Two of the later chapters describe a trip by dugout canoe from Somes Bar (mouth of Salmon River where Humboldt County meets Siskiyou County to where the Klamath meets the Pacific Ocean at Requa in 1921. The road from the coast reached Orleans in 1921. Chapter XXIV (page 148) Down the Klamath and Chapter XXV (page 156) From Martin's Ferry to Requa (Martin's Ferry is the is the intersection with Bald Hills Road (still partially unpaved) that is the back entrance to Redwood National Park and traverses Lady Bird Johnson Grove prior to joining 101.
What is described is country that after less than 75 years of miners and other settlers and the impact of their activities, most that occurred when the area was only accessed by mule, horse, or foot. Thornbury drove to Orleans and went by trail to Somes Bar. The dams being removed are father up the Klamath in Siskiyou County and Oregon.
Here is the link to a pdf (page 149): https://archive.org/details/californiasredwo00thor/page/148/mode/2up