Humboldt 101 Drainage South

This project will rehabilitate drainage systems at 38 locations along U.S. 101 in Humboldt County approximately from the Mendocino County line to Rio Dell. It is necessary to preserve the roadway and prevent potential damage from storm events by repairing failing and deteriorated drainage systems that have exceeded their design life.

Project Description

The project would replace culverts, downdrains, drainage inlets, headwalls, endwall, and retaining walls, as well as install rock slope protection and rock-lined ditches.

Timeline

The environmental phase of this project is currently underway with construction anticipated from fall 2024 to the end of 2026.

Traffic Impacts

Minimal

Documents

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•  Final Environmental Document:
  • Initial Study with Mitigated Negative Declaration and Final Section 4(f) de minimis Evaluation - April 2023 (PDF)

For more information, contact:

Julie Price, Environmental Coordinator

(707) 362-5431

Myles Cochrane, Public Information (Media inquiries)

(707) 498-4272

Last reviewed: April 2023