YOUNGSTOWN — With work starting on a $42.7 million project to keep wastewater from flowing into Lake Glacier, numerous Mill Creek Park roads, trails and facilities will be closed starting Monday for two years or more.

The closures are needed to safely complete the first two phases of the four-part project, said Charles Shasho, deputy director of public works.

The project is supposed to be finished no later than May 29, 2028, but Shasho said he expects it to be done in late 2027.

The work will close several streets in Mill Creek Park.

That includes:

● Tod Avenue from Irving Place to Weaver Road.

● Weaver Road from Fellows Riverside Gardens to Tod Avenue / Price Road.

●Price Road from Weaver Road to Milton Avenue.

● Calvary Run Drive from South Belle Vista Avenue to Price Road / West Glacier Drive.

● Milton Avenue from Calvary Run to Price roads.

● West Glacier Drive from Price Road to West Drive.

●West Drive from Birch Hill to Memorial Hill drives.

The only way to access Fellows Riverside Gardens will be from Mahoning Avenue.

Also closed are four trails: Calvary Run, Old Tree, One Way Drive and Slippery Rock.

In addition, the Slippery Rock Pavilion, the Lake Glacier Boathouse, Old Log Cabin, and picnic areas and parking lots by Lake Glacier will be closed. Fishing and paddle boats won’t be permitted on the lake during the construction project.

Marucci & Gaffney Excavating Co. of Youngstown is handling the two-phase project.

It includes eliminating four sewer overflow lines and replacing about 8,000 to 9,000 linear feet of sewer lines that range in size from 36 to 60 inches with a new 96-inch sewer line.

There will also be bridge work, river crossings, efforts to lower the lake and the relocation of utilities.

The work is part of a large wastewater improvement project being done in phases by the city as part of a 2014 federal consent decree.

The third and fourth phases of the park’s interceptor sewer project will be to Lake Cohasset and will eliminate 10 other sewer overflows.

The project is supposed to start in April 2028 and be finished by September 2032. When that occurs, roads, trails and facilities around Lake Cohasset will be closed during the duration of the project.

In addition to eliminating the sewer overflows at Mill Creek Park, the city made major improvements at its wastewater treatment plant.

It will also construct an 80-million-gallon-per-day wet weather facility. The city was initially supposed to build a facility that held 100 million gallons per day, but successfully negotiated with the federal government in court to reduce that amount.

The city plans to have all of the work done by Oct. 1, 2035.