Eureka-Arcata U.S. 101 Corridor Improvement

Caltrans has been making improvements to U.S. 101 between Eureka and Arcata. These safety and operational improvements include an undercrossing at Indianola Road, a northbound traffic signal at Airport Road, acceleration and deceleration lane improvements, the installation of cable median barrier, bridge and rail replacements at Jacoby Creek and Gannon Slough and tide gate replacements.

Indianola Undercrossing

This undercrossing project at Indianola Cutoff is intended to enhance safety. Caltrans does not anticipate significant traffic impacts for this project, but travelers are advised to remain alert and slow for the cone zone as traffic conditions can change quickly.

While subject to change with conditions, this project is currently estimated to be complete by the end of 2025.

A rendering of the Indianola Undercrossing. Simulated vehicles pass underneath a grey concrete overpass stamped with images of egrets flying and wind embellishments. A pair of simulated pedestrians run along a sidewalk bordering the undercrossing.  A rendering of the Indianola Undercrossing. Simulations show a grey concrete overpass stamped with images of egrets walking along a shore with grass and wind embellishments. A pair of simulated pedestrians walk along a sidewalk bordering the undercrossing.  Simulated lights illuminate the corners of the structure.

(Simulations of Indianola Undercrossing. Details subject to change.)

Indianola Undercrossing Groundbreaking Ceremony | June 2023

Indianola Undercrossing Project Update | February 2023

For more information, contact:

Project Manager:
Jeff Pimentel
(707) 834-9529, TTY 711

Public Information (Media Inquiries):
Myles Cochrane
(707) 498-4272, TTY711

Last reviewed: February 2023

Jacoby Creek Bridge Replacement Timelapse Video

Eureka-Arcata Corridor Comprehensive Adaptation and Implementation Plan - October 27, 2021 public meeting workshop

Social Media Updates

Follow District 1 on Facebook, Twitter and Instagram for the latest updates.
Click on the image to view the post. (External Site)

Screenshot of June 29 2022 Facebook post that readds "Heads up! Southbound U.S. 101 between Arcata and Eureka at the new Jacoby Creek Bridge is planned to be fully closed on the nights of Friday, July 22, and Saturday, July 23. The closure hours will be from 11 p.m. on Friday, July 22 to 5 a.m. on Saturday, July 23, and then from 8 p.m. on Saturday, July 23 to 6 a.m. on Sunday, July 24. Travelers should use Route 255 as an alternate during the closures. 5-minute delays on southbound 101 are also expected in the hours surrounding the closures. Crews will be working to complete the construction of the new Jacoby Creek Bridge. Travelers have been using a temporary detour bridge in the area as new bridge elements have been constructed adjacently. The closures are necessary to complete what is called the jack-and-slide method which will have crews moving the new bridge to its permanent location overnight. The old 1920s bridge reached the end of its useful life and had a lower deck height and surface area than the new bridge."


Screenshot of July 1 2021 Facebook post that reads "Changes are coming to U.S. 101 south of Arcata (Humboldt County) as the southbound Jacoby Creek Bridge detour opens to traffic on Tuesday, July 6. Watch the video below for more details on this bridge replacement project and a brief update on the Indianola undercrossing and half-signal project. #Hwy101 #Eureka #Arcata #Humboldt #EurekaArcataCorridor"


Screenshot of October 19 2021 Facebook post that reads "U.S. 101 EUREKA-ARCATA CORRIDOR UPDATE Project Manager Jeff Pimentel provides an update on the replacement of the Jacoby Creek Bridge, which will require two nighttime closures in the summer of 2022. Southbound motorists will be advised to use Route 255 for those two nights. Also, Jeff explains future construction of the Indianola Undercrossing on the ‘Corridor will not require any full closures. Stay tuned here for more updates on these projects."