Plum Creek Parkway Widening

Project update

  1. Closures

    Starting Monday, June 8 through June 22, Gilbert Street will be closed from Plum Creek Parkway to Baldwin Park Road. As part of the project to widen Plum Creek Parkway, crews will be working on the installation of a new storm sewer pipe along Gilbert Street to accommodate additional storm sewer infrastructure on Plum Creek Parkway. Motorists will need to detour through Downtown Castle Rock or up to Ridge Road. 

    Single lane closures will continue intermittently on Plum Creek Parkway, east of the Gilbert intersection. Motorists can expect minor delays as a result of the single lane closures. Trucks will also be entering the roadway on eastbound Plum Creek Parkway, just east of the intersection throughout the week.

    Pedestrian access through the intersection of Plum Creek Parkway and South Gilbert Street is now closed. Pedestrians will be detoured around the intersection through Baldwin Park Road up to the South Gilbert Street pedestrian crossing north of Elm Avenue. 

    Water quality pond on northwest corner of intersection

    The improved roadway down the Plum Creek Parkway corridor will also increase the volume of stormwater runoff during rain events. In many cases, roadways work to help convey water into the stormwater system. In order to help with the water quality draining into Sellers Gulch, a pond has been added to the northwest corner of the intersection of Plum Creek Parkway and South Gilbert Street.

From Founders Village to Downtown, Plum Creek Parkway is a key roadway that connects motorists to neighborhoods around Town. As part of its Transportation Master Plan, the Town is investing in the widening of Plum Creek Parkway, east of Gilbert Street. 

Project overview

In fall 2019, underground utility work began along Plum Creek Parkway in preparation for improvements to the roadway. This spring, the project moves into roadway construction to widen the parkway between Gilbert and Eaton streets and add two roundabouts.

This project will improve traffic flow for Plum Creek Parkway, but in the meantime, motorists are advised to take alternate routes. During construction of the roundabout at the intersection of Plum Creek Parkway and Gilbert Street, traffic flow will be reduced to one lane in each direction, creating delays. The Town will maintain access into neighborhood streets throughout construction of the roundabout at Eaton. Work will begin on the roundabout at Eaton in April, with the south portion taking place first.

Additional improvements with this project include a guardrail along parts of westbound Plum Creek Parkway, a new sidewalk, bicycle lanes and flashing crosswalk beacons to improve pedestrian and driver safety. 


Phase 1A of the project began in November 2019 and will be complete in summer 2020. Phase 1B of the project began in April 2020 and will be complete by the end of the year. 


Phase 1B of the project will cost about $6.8 million and is being primarily funded by the Transportation Capital Fund, which receives revenue from development impact fees. The replacement of the existing pavement, which is just under $1 million, will be funded mostly by sales tax revenue from the Transportation Fund. 

Transportation Planning

These improvements were defined in the Town’s Transportation Master Plan. Reducing congestion in the area has been a priority for Town Council. Learn more about that plan and read the document at

Plum Creek Parkway Improvements