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North St. Vrain Pipeline Relocation

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Project Status Update

Week of May 4, 2020

The contractor will be working in the road on Friday, May 8, to prepare for the final 2-inch asphalt overlay.

The 2-inch asphalt overlay on Apple Valley Road is scheduled for May 11-13. Final striping is anticipated to be completed by May 15.

Final work zone cleanup and project completion is anticipated by the end of May.

Use caution within the construction zone. Residents living within the construction zone will have access to their driveways during construction. Flaggers will help owners access their properties.


Crews replacing water pipeline in trench

In spring 2019, the City of Longmont and Town of Lyons began relocating their existing water lines from the North St. Vrain Creek corridor to Apple Valley Road. This relocation was mostly complete in fall/winter 2019, with the exception of asphalt overlay and lane striping.

Both pipelines are used to provide drinking water to Lyons and residents along Apple Valley Road.

The relocations reduced the risk of damage and loss of water service from future natural disasters, including floods.

Longmont and Lyons coordinated the water line relocations to minimize impacts to residents in Apple Valley.

Goals and Improvements

Lyons relocated a 12-inch water line; Longmont relocated a 24-inch water line.

The water lines were relocated to provide greater protection from natural disasters and allow better access to the pipelines for future operations and maintenance. Previously, the pipelines were within the floodplain or floodway of the North St. Vrain Creek and ran along or cross the creek.

The new pipeline locations were installed within the Apple Valley Road right-of-way with the majority of the pipelines situated outside of the floodplain. The image shows the location of the Longmont water line. The Lyons water line will begin at Apple Valley Road and Antelope Road and end at Apple Valley Road and US 36.

Click on the map below to view a PDF of the relocation project.

North St Vrain Pipeline Relocation Map


The two water line projects began construction in June 2019 and continued throughout most of 2019. Final asphalt overlay and lane striping took place in spring 2020.

View the letter mailed to residents about the North St. Vrain Pipeline construction (PDF).


Both pipelines were affected by the 2013 Flood and received federal funding for their relocations.


City of Longmont Project Manager: Larry Wyeno 

Town of Lyons Recovery Lead: Tracy Sanders

Questions or comments about this project may be submitted via or by contacting the PWNR Customer Service Center at 303-651-8416.

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