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Big Dry Creek Sewer Improvements Project

Trail Detour in Place for 4th of July Celebration at City Park

Construction on the Big Dry Creek Sewer Improvement Project is ongoing, and the current trail detour near City Park will remain in place during the 4th of July Celebration at City Park. The map below shows the pedestrian detour route which is necesary for safety reasons during heavy construction. The route will be lined with signs to help guide patrons who walk to the fireworks show from nearby neighborhoods or parking lots. Two golf cart shuttles operated by City staff will be available to transport those who need assistance. 

What's Happening Now

This summer, work will take place in the open space behind W. 98th Pl., Upham Dr., and Teller Ct. in the area shown on the map below. The City’s contractor will improve the condition and lifespan of the existing sewer pipe by inserting a new pipe liner. This process is less costly and results in fewer impacts to the public compared to excavating and replacing the pipe. This work will begin in June or July and take several weeks to complete. Construction schedules and impacts could shift due to unforeseen circumstances. No impacts to water or sewer services are expected.  The sewer pipe being lined is just upstream from the sewer pipe that was lined near Teller Ct, in late 2020. There will be construction activity in and around the open space and trail including: truck traffic, pumps, vehicles, construction crews and above ground temporary sewer pipes. Measures will be taken to minimize noise. Crews will access the construction area using Teller Ct. and Wadsworth Blvd. You will see truck and equipment traffic in the area during work hours and trail detours will be necessary at times. Normal working hours will be 7 a.m. to 5 p.m., Monday through Friday. Hours may vary for special circumstances.












Meanwhile, the paved detour for trail users around the City Park pond area will remain in place until further notice. If you want to access Big Dry Creek Trail from City Park, it will be most convenient to park in the lot off W. 105th Ave. near Christopher Fields and cross through the Armed Forces Tribute Garden to connect to the trail. For the safety of trail users and construction workers, please follow all trail safety and detour signage.

Sewer construction is still on schedule to finish this year. Areas impacted by sewer construction will be restored with native plants after construction is complete.


Project Summary


The City of Westminster is investing $32 million to repair and replace sections of large sewer pipe throughout the northern portion of Westminster beginning in 2020. Although mostly out of sight, this network of underground pipes is critical to protecting public health and the environment 24 hours a day, seven days a week. 

The majority of the Big Dry Creek Interceptor Sewer was installed in the 1970’s and 1980’s.  Recent studies have indicated that sections of existing pipe need rehabilitation and additional sections of pipe are required to ensure adequate capacity for current and future wastewater flows.

Approximately half of this project involves lining existing pipes using cured-in-place pipe at various locations throughout Westminster. Cured-in-place pipe technology is a cost-effective and reliable alternative to excavating and replacing pipe which reduces both expense and disruption for residents and inconvenience for motorists and trail users. You will see construction vehicles and workers when the cured-in-place pipe is installed, but there will not be heavy construction or road closures.

The other half of this project involves excavating and installing a new section of pipe and excavating and replacing sections of existing pipe. Most of this work will take place in the open space near City Park between 110th Ave and Sheridan Blvd on the northern end and east of the Butterfly Pavilion just south of 104th Ave near Westminster Blvd on the southern end. This new pipe will add resiliency and redundancy to the sewer pipe that serves as the main "artery" carrying wastewater to the Big Dry Creek Wastewater Treatment Facility from the northern two-thirds of the city as far west as Standley Lake. This work will impact trails in the open space surrounding City Park. Trail detour instructions will be provided throughout construction.

When this construction is complete, areas disrupted by this work will be fully restored to original conditions. There will be some long-awaited improvements made to the park and trail system above and beyond current conditions!

Email Updates

Project Map

Zoom in using the '+' and "-" buttons on the top right. Click any of the colored lines or shapes to get more information. Open the map in a new window. 



Project Funding

This project is financed by a Clean Water State Revolving Fund low-interest loan. The Clean Water State Revolving Fund program is administered by the Colorado Water Resources and Power Development Authority with joint funding from the U.S. Environmental Protection Agency and the state of Colorado. Clean Water State Revolving Fund programs operate around the country to provide states and communities the resources necessary to maintain and improve the infrastructure that protects our valuable water resources nationwide.





Colorado Department of Public Health and the Environment Logo

Colorado Department of Local Affairs Logo

Colorado Water Resources and Power Development Authority Logo


Environmental Assessment

As part of the application process for the Clean Water State Revolving Fund low-interest loan, the city completed an Environmental Assessment for this project. 

Environmental Assessment and Project Needs Assessment

Project Timeline

Cured-in-place pipe lining began in fall 2020 and several project areas have been completed as of November 2021. Cured-in-place piping lining is expected to be completed by mid-2022.

New pipe installation near City Park began in 2021 and will continue through the end of 2022. Restoration of construction areas will take place in phases as construction is completed and will continue into 2023.

Following this sewer project, the city will be conducting streambank restoration and park improvement work in 2023 and beyond. Stay tuned for more information about these improvements.

These timelines are estimates and are subject to change pending weather and other delays.

Resident Notification

The City of Westminster understands that this construction impacts residents as well as users of our parks and open spaces, and greatly appreciates everyone’s patience. We will make every effort to ensure construction impacts and project updates are communicated early and often.  Sign up to receive project emails using the form above, or follow the city on Facebook, Twitter or Nextdoor for regular updates. Direct notification will be delivered by mail or door-to-door to residents and businesses most impacted by this project. 

Why is this project necessary?

If the sewer pipe in the street in front of your home fails, it's a bad day for you and maybe your neighbors. If the sewer pipe that serves as the main "artery" collecting wastewater from your neighborhood and many other neighborhoods fails, it would be a bad day for thousands of people. This project will create resiliency for the main "artery" sewer, so that if it fails, the new pipe can maintain service. This project will also rehabilitate the condition of aging pipes throughout the northern part of Westminster to ensure the reliable, high-quality service our residents expect.

This project was identified following a comprehensive study of the city's sewer system in 2015 and updated in 2018. This study assessed the condition of the existing sewer system, identified risks to maintaining reliable service and prioritized system needs to help the city invest ratepayer funds as efficiently as possible.


Please don't hesitate to reach out to the project team who can be reached by email at bigdrycreeksewer@cityofwestminster.usor by phone at 303-706-3005. Thank you for your patience while we invest in our community!