Schatz Demonstration Tree Farm Road Improvement Project (Lake or Streambed Alteration Agreement No. EPIMS-HUM-58743-R1C)

The Schatz Demonstration Tree Farm Road Improvement Project, governed by Lake or Streambed Alteration Agreement No. EPIMS-HUM-58743-R1C, involves upgrading four culvert encroachments within the Mad River watershed in Humboldt County, California. Located approximately 13 miles southeast of Arcata, the project is being carried out by Sara Hanna of Cal Poly Humboldt and approved by the California Department of Fish and Wildlife. The scope of work includes the excavation and removal of existing 18 inch diameter culverts and their replacement with new culverts of at least 24 inches in diameter. Additional requirements include backfilling, compaction of fill, and the application of rock armoring at inlets and outlets to minimize erosion, with specific rock slope protection required for Crossing-1. The project is classified under NAICS code 237310 and is designated as a Class 2 Categorical Exemption per California Code of Regulations Title 14, Section 15302, as it replaces existing structures on the same site without anticipated significant adverse environmental impacts. Performance is centered in Section 32, T5N, R3E, Humboldt Base and Meridian, within the Maple Creek USGS quadrangle at Assessor Parcel Number 313-141-020. Jonathan Hollis, an Environmental Scientist with the California Department of Fish and Wildlife, serves as the primary point of contact for the project, which was signed on July 29, 2026.