City Infrastructure Projects

The following information highlights City infrastructure projects, which are primarily managed by the Public Works and Transportation departments. Below you will find highlighted major projects that have long-term, significant public impact.

View Major Projects Map

Crosstown Connector Project

Orange Maintenance Projects Street Sign

Beginning Fall 2025, the city will conduct a multi-phase water system maintenance project to replace valve components on the water transmission main that connects the Ten-Mile Water Treatment Plant to the City of Helena’s reservoirs. Phase 1 of the Crosstown Connector Valve Replacement Project will include work at 13 locations on the west side of Helena (please see the map attached to this notice). The project will require limiting the water supply from the Ten Mile Water Treatment Plant and supplementing with water from the Missouri River Treatment Plant until the construction is complete. Whenever the Missouri River plant is turned on, it is common that some residents experience slight discoloration or odor in their water. The changes should not be of concern and are typically resolved quickly.

The project has been planned to minimize disruptions to the public; however residents may encounter temporary street closures and traffic control measures, and some properties may require temporary water service to be piped in from elsewhere in the system. City staff and the contractor team will be in contact with any property owners impacted by the work.

The project will be completed in four phases: Phase 1 (tentatively scheduled for Fall 2025), Phase 2 & 3 (tentatively scheduled for Fall 2026), and Phase 4 (tentatively scheduled for Spring 2027). Construction will pause in the summer months due to increased water demands due to irrigations. The project is funded by the Drinking Water State Revolving Fund.

View the Crosstown Connector Project Map

Street and Trail Project Notices

Multi-Location Mobile Chip Seal Project – July 21-24

The City Streets team will perform chip seal asphalt repair in several areas around town next Tuesday through Friday, July 21-24.

Multi-Location Asphalt Milling Project – July 13-17

The City Streets team will close portions of California St., N. Lamborn St., S. Rodney St., N. Roberts St. and N. Hannaford St. for milling and paving next week, July 13-17 from 7 a.m. to 7 p.m.

Crack Seal Repair on Colonial Drive - July 13-14

On July 13-14, the City Streets team will perform crack and seal asphalt repair on Colonial Dr. from the entrance to Shodair Children's hospital to the edge of the City limits, just beyond Deerfield Ln. The work being completed is a mobile operation. There will be traffic control devices on-site to notify motorists to be aware of work ahead.

Dust Control on Clark, Harrison, Curtis, Ming and Others – July 10

The City Streets team will close the dirt portions of Clark St., S. Harrison St., Curtis St., Ming Pl., Adams St., Howie St., Monroe Ave., Hayes Ave. and Gold Ave. on July 10 for dust control application.

Knight St. Valley Gutter Removal – July 9

The City Streets team will close a portion of Knight St. between Cleveland St. and Allison St. on Thursday, July 9 from 7 a.m. to 5 p.m. to remove old valley gutter.

Dust Control on Rodney, Sparta, Division, and Clancy – July 8

The City Streets team will close the dirt portions of Davis St., Rodney St., Sparta St., Division St. and Clancy St. on July 8 for dust control application.

Crack Seal in Auto Mall and Mountain View Meadows Area - July 6-10

The City Streets team will perform crack and seal asphalt repair along streets in the area of the auto mall off Hwy 12 and in the Mountain View Meadows neighborhood next week, July 6-10. There will be traffic control devices on-site to notify motorists to be aware of work ahead. The work itself is completed by a mobile crew.

Tricia St. Lane Closure – June 25

The City Streets team will close the westbound lane of Tricia St. between Lola St. and Irene St. on Thursday, June 25 from 7 a.m. to 5 p.m.

Northwest Passage–Ambrose Connector Trail Construction

Construction will also begin on a new connector trail linking the Northwest Passage Trail and the Ambrose Trail in Mount Helena Natural Park. No impacts to users are anticipated during construction.

Oakes Street Park Trail Reroute

City Open Lands are working on construction of a reroute of the Oakes Street Park Trail. The existing trail will remain open until the new trail is complete, then the old trail will be decommissioned.

Major Projects (Active)

8th Ave. Main Replacement

The City of Helena has contracted with Northwest Landworks LLC to replace a water main along 8th Ave. between N. Hoback Street and Idaho Ave. Temporary water service may be required periodically for affected residents. This project is estimated to take two weeks to complete and will require the temporary closure of 8th Ave.

Lawrence Water & Sewer Main Replacement

The City of Helena has contracted with Northwest Landworks LLC to replace a water main along Lawrence St. between Monroe and Park Ave. and a sewer line on Lawrence between Dearborn and Benton Ave. Temporary water service may be required periodically for affected residents.

West Main/Eureka to Hale Connector

The project consists of replacing an existing water main between
the Eureka Well and the Hale water storage tank with a new 8”
water main between the well and the storage tank. A separate
dedicated 12” water main between the storage tank and the
distribution system on West Main Street. An additional 12” water
main will also connect from West Main to Reeder’s Village.