Planning commission denies Soda Bay greenhouse project, citing cultural and hydrologic concerns

The Lake County Planning Commission denied a proposed cannabis cultivation and processing project at 140 and 270 Soda Bay Road on March 26, concluding that the record did not support a finding that environmental impacts could be mitigated to less than significant.

Associate Planner Trish Turner summarized the project (PL-25-67 / UP21-40 / DR2306): about 43,200 square feet of mixed-light cultivation in greenhouses, a 6,000-square-foot processing/nonvolatile-manufacturing building, and a 2,400-square-foot distribution facility on roughly 44.31 acres in unincorporated Lakeport. Staff’s environmental analysis relied on biological and hydrological reports and concluded impacts could be mitigated with the measures in the draft mitigated negative declaration, including setbacks from waterways and pre-construction surveys.

Public commenters, tribal representatives and local land-trust officials urged caution. Lake County Land Trust speakers and several neighbors submitted videos and testimony showing Manning Creek overtopping its banks near the proposed cultivation area and argued that runoff from the site reaches conservation lands and Clear Lake. Several speakers noted that the most recent biological field survey relied on reconnaissance-level work from 2019 (with a 2024 revision that did not add new field surveys), and said that wildlife use and wet conditions have changed since the older surveys.

Commissioners and staff focused heavily on two technical topics:

- Cultural resources: The project’s cultural-resources work identified multiple isolated artifacts on and near the parcel and noted several mapped sensitive sites within a quarter mile. Commissioners and the cultural-resource consultant said the density of finds and proximity to mapped sites raised the possibility that the project area could represent a cultural-resource district, which could require substantial data recovery and more intensive tribal monitoring than currently scoped in the record. Staff noted that a tribal-monitoring condition was included in the recommended mitigation measures and that the applicant had agreed to coordination with Big Valley tribal representatives.

- Flooding and hydrology: Residents and trustees showed video of Manning Creek jumping its banks and stressed potential phosphorus and sediment transport into Clear Lake. Project consultants attributed some flooding to fallen trees forming temporary obstructions and said mitigation would require coordination with wildlife agencies and likely infrastructure investment; county building staff clarified flood-zone construction standards (e.g., flood vents, elevated utilities and equipment, elevation certificates for certain buildings).

After extended deliberation, a commissioner moved to find that impacts could not be mitigated to less than significant and to deny the mitigated negative declaration and permit; the motion passed on a 4–1 vote. Commissioners who favored denial cited insufficient, dated biological surveys in a sensitive area, unresolved questions about cumulative and site-specific hydrology, and the potential for significant cultural-resource impacts. The commission noted the applicant’s option to appeal to the Board of Supervisors within the seven-calendar-day statutory window.

Next steps: the applicant may appeal the decision to the Board of Supervisors; if no appeal is filed, the denial will stand and the applicant could revise the proposal, commission additional studies, and resubmit.