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Calpella Two Bridge Replacements

This project will replace the existing two bridges on State Route 20 (SR20) that span the Russian River and Eastside Road in Redwood Valley, Mendocino County (post miles 33.4 to 34.2).

The existing bridges will remain intact during construction to accommodate traffic. It was decided to construct one single bridge on an alignment slightly to the south allowing construction to take place with minimal impacts to the public.

Purpose and Need

The current Russian River Bridge was built in 1955 and is reaching the end of its service life. The Eastside Capella Overcrossing will also be replaced. The new bridge alignment will improve safety for motorists and bicyclists and will allow for better acceleration and deceleration lanes at the intersection of Route 20 and Road 144.

Project Timeline

  • Begin Construction: June 2022
  • End Construction: November 2025

Budget

  • Construction Capital: $28,701K
  • Right of Way Capital: $1,121K

Contact Information

Project Manager

Robert King (707) 296-5573

Public Information Officer (Media Inquires)

Manny Machado (707) 496-6879, TTY 711

Last reviewed: September 2024

Simulations of Proposed Designs

Simulation of proposed upgrades to Calpella Bridges on State Route 20 that span the Russian River and Eastside Road in Redwood Valley; Mendocino County (post miles 33.4 to 34.2).
Simulation of proposed upgrades to Calpella Bridges on State Route 20 that span the Russian River and Eastside Road in Redwood Valley; Mendocino County (post miles 33.4 to 34.2).
Simulation of proposed upgrades to Calpella Bridges on State Route 20 that span the Russian River and Eastside Road in Redwood Valley; Mendocino County (post miles 33.4 to 34.2).
Simulation of proposed upgrades to Calpella Bridges on State Route 20 that span the Russian River and Eastside Road in Redwood Valley; Mendocino County (post miles 33.4 to 34.2).

Construction Updates

2024
Intersection of two roads, Road 144 and State Route 20 in Mendocino County. Trees line the road on all sides. Bright white and yellow lane markers outline the two-lane highway and offramp and onramp to Road 144.

Road 144 opened in late September 2024 after being reconstructed to enhance acceleration and deceleration lanes

State Route 20 at calpella bridge under construction as of august 2024

The new Calpella Bridge in August 2024

State Route 20 at Road 144 is under construction east of Calpella Bridge.

Construction is almost complete on the new intersection that will connect Road 144 to Route 20

State Route 20 at Road 144 east of the calpella bridge which is under construction

The new intersection to the bridge will allow for improved acceleration and deceleration lanes

The new Calpella Bridge is visible alongside the old Calpella bridge under a blue sky with a county road running underneath.

The new Calpella Bridge alongside the old Calpella Bridge in May 2024

The new Calpella Bridge lined with orange delineators. The walls are stamped concrete with a wave pattern.

The new Calpella Bridge with stamped concrete walls in May 2024

2023

View from the bridge deck of Calpella Two Bridge Replacements Project. A cement crane is in the background with contractor crews working in the foreground.

Side view of the Calpella Two Bridges Replacement project with the bridge deck and column structure visible.
Construction is underway on the Calpella Two Bridge Replacement Project 

Social Media Updates

Follow District 1 on Facebook, Twitter and Instagram.

Click on the images below to view original posts. (External Site)

Screenshot of Facebook post from August 2, 2023 that reads "CALPELLA BRIDGE UPDATE: Motorists can expect some upcoming changes, as we continue to replace the two Calpella bridges across the Russian River and East Side Calpella Road in Redwood Valley, Mendocino County. Starting Monday, August 14, motorists traveling eastbound on Route 20 will be unable to use the left turn lane onto Road 144. And on the west end of the project, traffic will be routed onto a temporary alignment. These changes are expected to last until next spring and will allow for crews to connect the existing roadway to the new bridge. Myers and Sons Construction is the contractor for the $32.4 million improvement project with the assistance of $5.2 million from SB 1. Completion is expected in 2025." 

A thumbnail image of a District 1 Facebook post that reads

Screenshot of Facebook post about the Calpella Two Bridge Replacement Project.

Screenshot of Facebook post about the Calpella Two Bridges Replacement Project