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North St. Vrain Pipeline Relocation

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Project Status Update

Week of November 18, 2019

The 24-inch pipeline relocation is complete.

The contractor will be cleaning up the edges of the road and providing stabilization for any disturbed areas in early December 2019.

The remaining portions of the project, including a 2-inch asphalt overlay and centerline striping, will be completed after temperatures are warm enough to place asphalt. This work is anticipated for spring 2020.


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 is expected to continue through fall/winter 2019.

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

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

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

Goals and Proposed Improvements

Lyons will relocate a 12-inch water line; Longmont will relocate a 24-inch water line.

The water lines will be relocated to provide greater protection from natural disasters and allow better access to the pipelines for future operations and maintenance. Currently, the existing pipelines are within the floodplain or floodway of the North St. Vrain Creek and run along or cross the creek. Pipeline access in most cases requires crossing private property.

The new pipeline locations will be 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 are scheduled to begin construction in June 2019 and continue throughout most of 2019.

During construction, most activity will occur within a 500-foot construction zone that will be closed to all traffic except emergency vehicles. At the end of each work day, the road will reopen to two-way traffic.

Work hours will initially be from 8:00 am to 7:00pm within Boulder County jurisdiction and 7:00 am to 7:00 pm in the Town of Lyons jurisdiction. The City of Longmont and Town of Lyons will coordinate the two projects whenever possible to minimize the impact to residents.

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


Both pipelines were affected by the 2013 Flood and will receive 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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