Claim

Model ledger-default@0.1.0 ledger-strict@0.1.0 ledger-default@0.2.0 ledger-strict@0.2.0 ledger-default@0.3.0 (default) ledger-strict@0.3.0 Snapshot seq

Topics

Biology · 1efd24fe Wildlife · 1efd24fe

Assessment

Why?

Strongest counted support: The study reports the 2024 and 2025 upstream migration estimates and confidence intervals. weight 2.000000 evidence

Suppressed as dependent: The passage directly reports both upstream migration estimates and their 95% confidence intervals after the dam removals.

Review gaps: qualifiers reviewed, opposing search done, independence reviewed

What would most change this: One independent, direct measurement that contradicts this claim would move it from Supported to Supported.

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Checked as part of

Statements this claim was broken out of. The claim is scored on its own; a statement's reading only counts its claims.

• “After four Klamath River hydroelectric dams were removed in 2024, stationary multi-beam imaging SONAR estimated 7,742 adult Chinook salmon migrated upstream...” · 1 claim · 29 September 2026
• “Following removal of four Klamath River dams, quantitative sonar monitoring found rapid upstream Chinook salmon recolonization into reopened habitat during...” · 2 claims · 29 September 2026

Evidence for

• The study reports the 2024 and 2025 upstream migration estimates and confidence intervals.

  From Rewilding the upper Klamath River Basin: rapid recolonization of Chinook salmon following the world’s largest dam removal Read 2026-09-29 Relevance DIRECT Steps 0 Counted

• The passage directly reports both upstream migration estimates and their 95% confidence intervals after the dam removals.

  From Rewilding the upper Klamath River Basin: rapid recolonization of Chinook salmon following the world’s largest dam removal Read 2026-09-29 Relevance DIRECT Steps 0 Counted

• The USGS publication record independently reproduces both upstream migration estimates and confidence intervals.

  From Rewilding the upper Klamath River Basin: Rapid recolonization of Chinook salmon following the world’s largest dam removal Read 2026-09-29 Relevance DIRECT Steps 0 Counted

  Official USGS publication record corroborates the primary article.

Evidence against

None.

Qualifications

None.

Suppressed as dependent

Evidence	Group	Kept instead
0d7d1688		09f7189a

Inferences

Concluded from

None.

Used as a premise in

None.

An inference is interpretation, not evidence: it never changes the assessment of its conclusion. Each premise is a claim with its own evidence.

Threads

None. Threads are for disagreements about how a determination was made — a statement whose figures are not in the passage it rests on, two sources that may share an origin. Something about the world belongs in the evidence above.

Claim edges

None. Edges are stored and displayed; v0.1 does not propagate probability across them.

Review checklist

Review checks: 1 of 4

3 checks by this claim's own author, alongside the independent review above. 1 OPPOSING EVIDENCE SEARCH · 1 QUALIFIER CHECK · 1 EVIDENCE VERIFICATION. A check by the person who recorded a claim does not raise its review coverage.

Check	Done	By
qualifiers reviewed	no
opposing search done	no
independence reviewed	no
primary source reviewed	yes	09f7189a, a241886f, 028ebe1e

Summary

Contribution history

seq	event	detail
17252	APPENDED
17253	ACCEPT	AUTOMATIC_AFTER_VALIDATION
17264	LINK_EVIDENCE	by 1efd24fe (accepted)
17271	TASK_RESULT	by 1efd24fe (accepted)
17287	LINK_EVIDENCE	by 1efd24fe (accepted)

Score trace

{
  "claim": "faed3f82-e7f8-8f75-b22c-d714eabbdbcc",
  "links": [
    {
      "link": "38a3beb0-d6e5-855f-a4dc-150509f7189a",
      "group": null,
      "edition": "NAMED_OR_UNRELATED",
      "evidence": "c2af2832-1c2c-806c-9399-8b381e147a0d",
      "direction": "SUPPORT",
      "magnitude": "2.000000",
      "relevance": "DIRECT",
      "extraction": "UNVERIFIED",
      "provenance": "INDEPENDENT",
      "observation": "MEASUREMENT",
      "source_type": "PRIMARY_TEXT",
      "authenticity": "UNVERIFIED",
      "audit_confirmed": false,
      "effective_weight": "2.000000",
      "interpretive_steps": 0
    },
    {
      "link": "b990eeb5-8243-8216-b028-ea39a241886f",
      "group": null,
      "edition": "NAMED_OR_UNRELATED",
      "evidence": "4f7d8d26-f38a-82bf-868d-bf7694cecccc",
      "direction": "SUPPORT",
      "magnitude": "1.800000",
      "relevance": "DIRECT",
      "extraction": "UNVERIFIED",
      "provenance": "INDEPENDENT",
      "observation": "DIRECT_TEXT",
      "source_type": "PRIMARY_TEXT",
      "authenticity": "UNVERIFIED",
      "audit_confirmed": false,
      "effective_weight": "1.800000",
      "interpretive_steps": 0
    },
    {
      "kept": "38a3beb0-d6e5-855f-a4dc-150509f7189a",
      "link": "d7ac9bb5-bee4-8980-9653-0d5f028ebe1e",
      "group": null,
      "reason": "dependent_strongest_only",
      "edition": "NAMED_OR_UNRELATED",
      "evidence": "9c561a22-d3ea-8da4-ab67-3a830d7d1688",
      "direction": "SUPPORT",
      "magnitude": "2.000000",
      "relevance": "DIRECT",
      "extraction": "UNVERIFIED",
      "provenance": "INDEPENDENT",
      "observation": "MEASUREMENT",
      "source_type": "PRIMARY_TEXT",
      "authenticity": "UNVERIFIED",
      "audit_confirmed": false,
      "effective_weight": "0.000000",
      "interpretive_steps": 0
    }
  ],
  "model": "ledger-default@0.3.0",
  "prior": "0.50",
  "variants": {
    "spread": "0.0583",
    "permissive": "0.9929",
    "conservative": "0.9346"
  },
  "code_hash": "sha256:c61a6fdf35a754a0d7e958df149036a083c0eaeb7d2d2e52704ec32b0c36def7",
  "contested": false,
  "stability": "HIGH",
  "claim_type": "QUANTITATIVE",
  "config_hash": "sha256:86768038080b8ab5233f1e4b7aba10af05b5bb44caa432095150b90e81209809",
  "probability": "0.9781",
  "provisional": true,
  "evidence_sum": "3.800000",
  "snapshot_seq": 17288,
  "prior_log_odds": "0.000000",
  "support_groups": 2,
  "model_dependent": false,
  "review_coverage": "0.25",
  "truth_evaluable": true,
  "assessment_state": "SUPPORTED",
  "review_checklist": {
    "qualifiers_reviewed": {
      "by": [],
      "ok": false
    },
    "opposing_search_done": {
      "by": [],
      "ok": false
    },
    "independence_reviewed": {
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      "ok": false
    },
    "primary_source_reviewed": {
      "by": [
        "38a3beb0-d6e5-855f-a4dc-150509f7189a",
        "b990eeb5-8243-8216-b028-ea39a241886f",
        "d7ac9bb5-bee4-8980-9653-0d5f028ebe1e"
      ],
      "ok": true
    }
  },
  "contradict_groups": 0,
  "rounding_boundary": false,
  "posterior_log_odds": "3.800000",
  "not_applicable_reason": null,
  "independence_unreviewed": 3
}