Status:
March 2026
Segment A includes 12 miles of 42-inch diameter welded steel pipeline through Thornton and Adams County. Segment A is 78% complete at the end of 2025. Project will be complete in the second quarter of 2026.
Click on the image to the right to see the water pipeline route in Segment A.
(Phase 1) Pipeline status along Quebec St. between 120th Ave to 168th Ave.:
- Construction:
- 5.5 miles of pipe has been installed.
- Pipeline tie in work is active north and south of the E-470 tunnel.
- Pipeline work is ongoing north/south of Todd Creek.
- Pipeline work is ongoing south of Fossil Ridge Public Safety Center and in the Horizon Tributary.
- Ongoing restoration of easements to pre-existing conditions.
(Phase 2) Pipeline status south and west of the intersection at E 120th Ave and Quebec St. to the Wes Brown Water Treatment plant near E 88th Ave and Colorado Blvd.:
- Construction:
- 4.5 miles of pipe has been installed.
- Ongoing pipe installation on both sides of the intersection of Riverdale Road and 112th Ave.
- Pipe installation activities along the south/west side of McKay Road between 104th Ave. and the McKay Tunnel.
- Pipe installation near the Wes Brown Treatment Plant entrance for the future connection and PRV vault.
- Tunneling operations at 88th Ave. west of the Platte River.
- Restoration activities between McKay Road and 112th Ave. and north of 112th Ave. on private property.
- Ongoing restoration of easements to pre-existing conditions.
View the City of Thornton’s current capital improvement projects map.
Please call the Thornton Water Project mainline at 720-977-6700 if you have any questions.
