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ENVIRONMENTAL AND NATURAL RESOURCE DAMAGE LIABILITIES | 3 Months Ended
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Mar. 31, 2026
Environmental Remediation Obligations [Abstract] |
ENVIRONMENTAL AND NATURAL RESOURCE DAMAGE LIABILITIES | ENVIRONMENTAL AND NATURAL RESOURCE DAMAGE LIABILITIES We are subject to federal and state environmental laws that impose liability on current and former property owners for cleanup, restoration, and natural resource damages (“NRD”) generally on a strict-liability basis. For a description of the legal framework governing these obligations, see Note 13 — Environmental and Natural Resource Damage Liabilities in our 2025 Form 10-K. Changes in environmental and NRD liabilities from December 31, 2025 to March 31, 2026 are shown below:
| Port Gamble, WA | Other Sites | Total
Non-current portion at December 31, 2025 | $6,089 | — |  | $6,089
Plus: Current portion | 3,181 | — |  | 3,181
Total Balance at December 31, 2025 | 9,270 | — |  | 9,270
Liabilities assumed in the merger with PotlatchDeltic | — |  | 679 | 679 |
Expenditures charged to liabilities | (176) | (33) | (209)
Decrease to liabilities (a) | (181) | — |  | (181)
Total Balance at March 31, 2026 | 8,913 | 646 | 9,559
Less: Current portion | (5,439) | (218) | (5,657)
Non-current portion at March 31, 2026 | $3,474 | $428 | $3,902
(a)The decrease in liabilities resulted from revised environmental and NRD cost estimates recognized during the three months ended March 31, 2026. Port Gamble, Washington Upland mill site cleanup is complete, and NRD restoration is expected to conclude within the next year. The remaining liability primarily reflects estimated costs of completing the NRD restoration and long-term monitoring of the bay, mill site, and landfills, which is expected to continue for an additional 15 to 20 years. It is reasonably possible the recorded liability may increase as restoration progresses due to changes in scope, field conditions, or regulatory requirements. Monitoring obligations may also extend in duration or scope over the multi-decade monitoring period. We do not expect any loss in excess of amounts accrued to be material to our consolidated financial position or liquidity. See Note 11 — Commitments.

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