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Tri‑County officials flag risks to salmon returns as dams are removed and surveys are imperfect
Summary
Supervisors discussed puzzling short‑term increases in adult returns versus uncertain juvenile out‑migrant survival during and after dam removals, questioned current fish‑count infrastructure and CDFW survey funding, and urged Tri‑County coordination on monitoring and habitat assumptions.
Tri‑County supervisors and participants discussed anadromous fish (salmon) population dynamics and monitoring challenges, focusing on how dam removals and altered landscapes could change both adult returns and juvenile survival.
A supervisor noted that local and tribal economies depend on salmon and that local regulators are often evaluated by returning spawner counts; the speaker said the region cannot directly control return numbers and stressed the need to "get the mother cows home" — i.e., get more spawners back to produce juveniles — to lessen future regulatory burdens.
Another participant urged caution about short recovery timeframes. "All the fish that we're seeing come back right now have been in the ocean the entire time," the speaker said, adding that those adults did not experience dam removal and that the critical metric is juvenile out‑migrant survival during the multi‑year adjustment period. The speaker raised a specific claim that CDFW earlier recorded a large mortality event (an asserted figure of about 850,000 fish attributed in the meeting to 'gas bubble disease') and said that if out‑migrant survival drops after initial rebounds, regulators and users will face difficult policy questions.
Speakers also warned that wildfire‑altered watersheds (one speaker cited Klamath National Forest wildfire acreage) are producing "flashy" flows, higher sediment loads and lower fall flows that delay returns and create large amounts of unoccupied habitat; adding habitat without returning fish may not be productive. Participants said local survey methods are imperfect — for example, removable weir counting systems must be taken out during high flows — and that local partners have sometimes filled gaps in counting when state funding or infrastructure fell short.
The group treated the item largely as informational and encouraged continued Tri‑County collaboration on monitoring data, detection technology and regional advocacy for accurate counting and for adaptive responses if juvenile survival demonstrates longer‑term declines.
