State Route 49 American Canyon Roundabout

Project Description:

This safety improvement project is located within the City of Auburn on State Route 49 (SR-49), from 0.13 miles south of Lincoln Way and Borland Avenue at post mile (PM) 2.22 to their intersection with SR-49 at PM 2.35. The project proposes to realign two reversing curves to increase curve radii and improve sight distance. Additionally, the project consists of replacing the signalized intersection with a roundabout to improve traffic flow and safety.

Project Map:

Map showing the location of the State Route 49 American Canyon Roundabout project in Auburn, south of the Interstate 80 separation. The project is realigning two curves along a quarter-mile segment and replacing a traffic signal at Lincoln Way/Borland Avenue with a roundabout. map of route 49 map of 031h240 perspective view

Purpose and Need:

The purpose of the project is to reduce the potential number of collisions by realigning two reversing curves to obtain larger curve radii and improve sight distance. The issues addressed by a realignment are 1) the need to reduce the potential for sideswipe, head-on and various other collisions involving loss of control in the reversing curves and 2) the need to eliminate problems associated with trailers off-tracking on narrow shoulders in tight-radius curves.


This project was funded by the 2020 State Highway Operation and Protection Program (SHOPP) under the Safety Improvement Program.

Cost Estimate:

Support Cost: $3,800,000
Capital Cost: $6,050,000
Total Project Cost: $9,850,000


Project Approval & Environmental Document Spring 2019
Design Completed Summer 2021
Advertise Project Fall 2021
Begin Construction Summer 2022 Complete Construction Spring 2024

News / Events:

Press Releases:

10.19.22 Caltrans Beginning Safety Project on State Route 49 in Auburn

10.19.2023 Phase 2 Begins on American Canyon Roundabout in Auburn

11.01.2023 Borland Avenue Closed Along State Route 49 in Auburn

11.29.2023 American Canyon Roundabout Project Delayed Along State Route 49 in Auburn

03.26.2024 Traffic Delays Expected Along State Route 49 in Auburn

Project Contacts:

Mohan Bonala, Project Manager, (530)788-3259;

Jeremy Linder, Public Information Officer, (530) 701-5209;