Big Lagoon Multiple Culverts (0P240)

The Big Lagoon Multiple Culverts project, managed by Caltrans District 1 in Eureka, involves the replacement of two failing drainage systems on Route 101 in Humboldt County at post miles 111.21 and 111.24. The primary objective is to maintain the highway and preserve the road fill prism by upgrading deteriorated infrastructure, specifically replacing existing 18-inch cross culverts and drainage inlets. Construction will utilize the cut and cover method, and the project scope explicitly excludes the installation of rock energy dissipators. Classified under NAICS code 237310, the project is designated as a Class 1 categorical exemption under California Code of Regulations, title 14, section 15304, as it consists of minor alterations to existing facilities. The work is constrained to ensure there is no removal of healthy, mature, scenic trees and no adverse impact on sensitive plant or wildlife species. The project was forecasted on September 9, 2025, with Coady Reynolds serving as the primary point of contact.