2021 Construction

In-river construction will resume spring 2021. The work will primarily include capping in the main channel downstream of the Route 131 bridge to the Grasse River mouth and habitat reconstruction. There will also be habitat reconstruction and associated material placement along with additional work near Snug Harbor including backfilling and limited removal in coordination with the St. Lawrence Seaway Development Corporation. A narrated presentation and community mailer have been developed to provide more details about what’s planned 2021.

2020 Construction

The construction efforts for 2020 were completed in December. This includes completion of capping upstream of the Route 131 bridge, dredging at Snug Harbor, and initial habitat restoration and plantings. The 2020 efforts are summarized in the December project update.

The narrated presentation below provides an overview of the work completed in 2019, what was planned for 2020, and the measures taken during the 2020 project for protection of community health and safety.



Click to access a PDF of this presentation. This file includes the links to the resources and contacts mentioned in the presentation.

2019 Construction

The in-river portion of the U.S. Environmental Protection Agency (EPA) selected remedy for the lower Grasse River began in 2019. The overall goal of the project is to reduce polychlorinated biphenyl (PCB) levels in fish and other organisms in the river for the long-term protection of human health and the environment. The remedy was issued in EPA's 2013 Record of Decision, and includes:

  • Removal of targeted sediment from near shore areas of the river followed by the placement of clean backfill
  • Placement of an armored cap in the main channel of the river between the Alcoa Bridge and the Route 131 Bridge
  • Placement of a sand cap in the main channel of the river between the Route 131 Bridge and the confluence with the St. Lawrence River
  • Excavation of targeted floodplain soil and backfilling with clean soil
  • Habitat-related reconstruction work

Arconic selected J.F. Brennan as the contractor to implement the design plan. The construction efforts for 2019 included dredging in the near shore areas of the river, remediation of upland areas just upstream of the Alcoa bridge and the mouth of the Unnamed Tributary, backfilling and capping in the river, and reconstructing the near shore and floodplain areas. The 2019 efforts are summarized in the narrated video provided above.