I don't think that's accurate. The remaining dams have ladders, but the lowermost dams had no (or inadequate) ladders, hence the total absence of salmon from the upper Klamath.

> Although the Bureau of Reclamation’s Link River Dam and PacifiCorp’s Keno Dam currently have fish ladders that will pass anadromous fish, none of PacifiCorp’s Four Facilities (i.e., Iron Gate, Copco 1, Copco 2, and J.C Boyle dams and associated structures) were constructed with adequate fish ladders and, as a result, anadromous fish have been blocked from accessing the upper reaches of the Klamath Basin for close to a century.

N.B. Keno and Link River are _not_ being removed.

https://www.fisheries.noaa.gov/west-coast/habitat-conservati...