By 29 October 2026, California fish counting stations had recorded fall-run Chinook salmon in several Klamath River tributaries. The Klamath Irrigation District reproduced the preliminary counts from a California Department of Fish and Wildlife in-season update dated 30 October. Its annual water record also describes Chinook observations at two Oregon fish ladders beginning in September. The records help show where fish were moving in the third autumn following the 2024 removal of four lower Klamath dams. They do not yet give the final size of the 2026 run.
Where the October figures come from
The district's public water update attributes its figures to the California department's adult counting facilities. It lists 3,560 adult fall Chinook at the Shasta River station, 692 at Scott River, 83 at Shovel Creek, 16 at Jenny Creek and 13 at Bogus Creek through 29 October. The start dates differed across stations. Shasta began on 31 August in that table, while Jenny Creek began on 30 September. The district notes that the counts do not include fish spawning downstream of the stations. The values describe passages at particular monitoring points during particular periods. They should not be presented as the whole basin's escapement or used to rank the overall productivity of those waters.
In Oregon, the district says state monitoring recorded Chinook ascending the Keno and Link River dam ladders starting on 22 September, with a Chinook also recorded on the Spencer Creek video system. The district describes these as the first fall-run adults observed at those ladders since removal of the lower dams. The ladders are at structures that remain. The finding is evidence of fish reaching particular points, not evidence that all upstream structures are gone or that the fish subsequently spawned. The observations matter because they narrow the question from whether movement is possible in general to which routes fish are demonstrably using.
The study that provides a baseline
In August 2026, a U.S. Geological Survey publication described a separate analysis of adult Chinook salmon, *Oncorhynchus tshawytscha*, moving into reopened habitat in 2024 and 2025. Researchers used stationary imaging sonar to estimate upstream passage during those first two migratory seasons. They estimated about 7,742 adult Chinook in 2024 and 13,310 in 2025 at the study reach. The study describes the four 2024 removals as reconnecting more than 640 kilometres of habitat available to migratory fish. That geographic measure describes the opportunity created by reconnecting the river. It does not say that every kilometre offered equally suitable spawning or rearing water.
Those older estimates are useful context for the new counts, but the methods and areas differ. The imaging study estimated passage into reopened reaches over two seasons. The October table reports interim observations at individual tributary stations. Adding figures across the two records would mix years, locations and approaches. Comparing them directly could make a difference in timing or coverage look like a change in the total population. The useful conclusion they share is that adult fish are observed at several points in the connected system. Stronger comparisons will need matched places, time windows and methods.
From passage to spawning and survival
An adult Chinook counted at a station has passed one point in its migration. It may continue upstream, spend time in the area or enter a tributary. To understand what the passage means for the next generation, biologists also look for spawning, estimate the number of fish that reached spawning areas and study the young fish later leaving those waters. The U.S. Fish and Wildlife Service describes annual mainstem spawning surveys with the Karuk and Yurok Tribes, generally running from early October through December. Those records bring a different view of the run from fixed stations, and collaboration with the tribes is part of the actual monitoring work.
Conditions after spawning can limit the benefit of adult access. Eggs need suitable gravel and water movement. Juveniles encounter different flow, temperature and disease conditions as they move downstream. U.S. Geological Survey research describes juvenile monitoring through tags and other techniques alongside state capture and recapture work. It can test whether patterns in timing or survival change after removal. A large adult passage count alone says little about how many juveniles survived a warm period or reached the ocean. Conversely, a strong juvenile count in one tributary does not describe every other part of the basin.
These distinctions are important in a river with complex water operations and a long history of contested decisions. The irrigation district's publication gives a local water manager's view and makes the preliminary status of the California counts clear. The federal studies and tribal monitoring partnership supply complementary evidence about fish movement and survival. Each source can answer a different question. Using a district update as a pointer to current station observations does not make its broader water management account an independent test of the cause of the salmon results.
What anglers can follow next
The immediate milestone is the close of monitoring for this fall run, followed by a final accounting that says how each station was operated, what was missed and where spawning was observed. A useful season report should distinguish counts from estimates and explain changes in timing or equipment. A station that starts later than in a previous year can miss early fish. An early strong number can also slow later in the season. These are reasons to follow the final report rather than treating a late-October snapshot as an annual total.
Why the reference counts have ranges
The USGS research gives estimated ranges of 7,702–7,778 fish for the 2024 total and 12,876–13,733 for 2025. Those ranges go with the estimates at the study site. An imaging sonar records targets moving through its sampled water, and the analysis uses observations and classification to estimate passage. A wider range is a reminder to keep that uncertainty attached when comparing years. It is also a reason to retain the method beside any number quoted in a future update.
Tributary stations offer a different view. To compare a late-October report across years, the reader would want the same station and cutoff date and information on days the equipment operated. The report that counts through October 29 gives a clear cutoff for the named stations. Comparing it with a completed season, or comparing a longer-running station with one that opened later, changes the amount of migration included in the window. Adult counts and the first observations at a ladder are also different types of evidence.
Later reports from spawning and juvenile surveys can add a check downstream of passage in the life cycle. Locations of nests tell researchers where adults spawned. Juvenile sampling gives evidence of production and movement under that season's water conditions. Connecting those observations over time is how the teams can learn whether newly reached habitat contributes to subsequent generations.
Fish distribution is also different from fishing opportunity. A passage observation near an Oregon ladder or at a California station does not tell an angler whether a reach is open or which retention rules apply there. Readers should check the current agency rules for the relevant water before a trip. The station numbers are valuable for following a returning fish population and understanding what changed after reconnection. They are not a location recommendation for fishing near monitoring equipment.
In the longer term, researchers can compare multiple seasons of adult passage and juvenile output under different flow and temperature conditions. That comparison will show which reopened reaches function as productive habitat and which still need attention. It can also separate a repeated pattern from the effects of one year. The late-October records are one new piece of that evidence. They give a clearer picture of passage at named locations while leaving the final run size, spawning distribution and juvenile survival open.