Latest News


October 4, 2019

SWSP II Construction Update

Project Manager Stephanie Cecil provides an SWSP II construction update. 


August 27, 2019

Updated Construction Notice

Construction of the Southern Water Supply Project II will have the following impacts from Sept. 9 through Dec. 2019.

General impacts: Heavy construction activity and noise Sept. 9 through Dec. 2019
*Recommend dogs on-leash in Coot Lake area for safety*

Park impacts: Partial Tom Watson parking lot closure Oct./Nov. 2019

Access impacts: Heavy construction activity on west side of Tom Watson Park and 63rd St. pedestrian crossing Oct./Nov. 2019

IBM Connector Trail: Closure west of 63rd St. Sept./Oct. 2019.

Aug./Sept. 2019: Fencing, surveying and general preparation

Sept. 2019 - Jan. 2020: Major pipeline construction and restoration

Feb. 2020: Anticipated project completion.

2019-8-21 Coot lake sign_draft


July 2, 2019

Lagerman Trail Closure

Due to construction of the SWSP II project a section of trail at the Lagerman Agricultural Preserve will be closed. The section that will be closed is located on the eastern part of the trail, along 75th Street between the James Ditch and Pike Road. The closure dates are approximately July 15 through early September. 



May 3, 2019

St. Vrain Road Closure

Beginning Thursday, May 9, St. Vrain Road will be closed just West of the Boulder County Offices, and will not reopen until Tuesday morning, May 14. During this time the only traffic permitted on St. Vrain Rd will be homeowners along St. Vrain Rd and Boulder County employees.

There will be a detour plan along North 75th St and Airport Rd to route traffic that would normally uses St. Vrain Rd as a throughway. Garney, the City of Longmont, and Boulder County understand that this is an inconvenience to your normal day-to-day activities. We appreciate your patience and cooperation through this closure will minimize impacts in the future.

If there are any questions or concerns about the closure, contact Ethan Louis at (814)528-3089.

(Click image for larger size)


February 7, 2019

Major Milestone Completed for the SWSP II Project

Tunnel2Precision Boring Technology, a sub-contractor to Garney Construction, has completed all of the trenchless crossing installations for the SWSPII project. Over 1,000 linear feet of 42-inch and 48-inch diameter steel casing pipe was installed underground at 13 critical road and railroad crossings throughout the length of the 21-mile project. A process known as hand-tunneling was utilized to install the casing pipe without interrupting traffic or closing down roadways. The team began working on these crossings in August 2018 and completed the work in February 2019.



November 29, 2018

Construction Begins on Original SWSP Pipeline 25 Years Ago this Month

Placement of pipeline in trenchIt was 25 years ago this month that construction began on the Southern Water Supply Project pipeline from Carter Lake to Broomfield. The project was initiated when the City of Broomfield needed a new water supply source due to potential contamination in the city's Great Western Reservoir. Other communities had increasing demands and water quality standards, requiring a dedicated water delivery pipeline. The original Southern Water Supply Pipeline met Broomfield's needs and also provided other communities with a year-round water supply. In addition, sharing a single pipeline was less costly than if each participant had built its own project.

Construction of the pipeline began in 1993 and was completed in 1999. Due to project participants' increasing water demands, particularly during the higher-demand summer months, the West Longmont Pump Station was added in 2003 to increase the capacity of the pipeline. Two years later an additional pump station at Broomfield followed to further increase the capability to deliver water during the high-demand months.


October 26, 2018

October Construction Activities

Project Engineer Stephanie Cecil talks about October construction activities. 


October 17, 2018

Construction to Impact Boulder County Roads

Interactive Map SnippetBeginning on Oct. 20 and going through Oct. 28, expect delays on Northern Boulder County Roads – N.73rd/N.75th will be closed due to construction of the Southern Water Supply Project II Pipeline. The project will require travel delays on Boulder County Roads including: N.75th Street, N.73rd Street, N. 63rd Street, Hygiene Road and Niwot Road. N. 75th Street will be closed from 7 a.m., Oct. 20 to 7 p.m. Oct. 28, 2018.


September 18, 2018

Aug. 23, 2018 Construction Activities

Northern Water Construction Manager Mike Fiscus talks about construction activities on Aug. 23.    


August 29, 2018

Construction Commences on New Water Supply Pipeline

layed pipeWork has begun on a new pipeline project to bring reliable water supplies to four water providers in Boulder and Larimer counties. Called the Southern Water Supply Project II, the pipeline will bring additional Colorado-Big Thompson Project and Windy Gap Project water to the city of Boulder, town of Berthoud, Left Hand Water District and the Longs Peak Water District. 

The $44 million project includes more than 20 miles of steel pipe that will provide improved water quality, increased delivery reliability and during some portions of the year will act as the primary source of raw water for the participants in the project.

Read more


August 15, 2018

Construction Begins on SWSP II

Stripping TopsoilConstruction activities are underway for the Southern Water Supply Project II pipeline that will deliver water from Carter Lake to the City of Boulder, Town of Berthoud, Left Hand Water District and Longs Peak Water District. Current construction activities include surveying, pre-construction photo/video documentation and stripping topsoil. The bore contract began mobilizing with work being on Boulder County right-of-ways. The pipeline will arrive the week of Aug. 20.


August 3, 2018

SWSP II Interactive Map Launched

SWSP 2 Interactive Map
The interactive map provides an overview of the pipeline alignment as well as the anticipated schedule for pipe laying activities and road/trail impacts. Pre-construction work may take place prior to pipe laying activities in some areas.


July 24, 2018

SWSP II Website Launched

Installed pipeline in field
Northern Water has launched a new website in its continued efforts of keeping the public well-informed about the Southern Water Supply Project II.

The new project website at provides a wide array of details about the project, such as maps, documents, timelines, information about the participants and much more. 

Construction is slated to begin August 1, 2018. This website will provide the public with the latest construction information.


May 21, 2018

Northwest Pipe Company Awarded the SWSP II Contract

Pipeline installation into trench

VANCOUVER, WA – 5/21/18 – Northwest Pipe Company (Nasdaq: NWPX), an industry leader of engineered welded steel pipe products for the water transmission market, was selected by Garney Construction of Kansas City, Missouri to provide a combined total of 108,400 feet of 36 and 32inch diameter steel water pipe for the Southern Water Supply Project Phase II located in Northern Colorado. Manufacturing is scheduled to begin early next month ahead of deliveries starting in July 2018. The project is anticipated to be substantially complete by the end of January 2020.

“We are very pleased to be working with Garney Construction Company to help provide vital water infrastructure to the Northern Colorado Water Conservancy District,” said Scott Montross, President and CEO of Northwest Pipe Company.

About Northwest Pipe Company
Northwest Pipe Company is the largest manufacturer of engineered steel pipe water systems in North America. The Company’s manufacturing facilities are strategically positioned to meet North America’s growing needs for water and wastewater infrastructure. The Company serves a wide range of markets and its solution-based products are a good fit for applications including: water transmission, plant piping, tunnels and river crossings. The Company is headquartered in Vancouver, Washington and has manufacturing facilities across the United States.

Robin Gantt, Chief Financial Officer, 360-397-6325