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Improving dam safety at Little Long

Ontario Power Generation is making safety improvements to water control structures at the Adam Creek spillway, and other nearby dams on the Mattagami river.

Explore below to see another way OPG is working with community partners on efficient energy projects.

Controlling water levels

The Little Long Dam Safety Project will increase the discharge capacity at the existing eight-gate Adam Creek spillway structure located on the Little Long Reservoir in Northeastern Ontario. Located about 90 km north of Kapuskasing, the project will add four new sluice gates and make other reliability improvements.

A sluice gate works like a sliding barrier that dam operators use to control water levels and flow rates in rivers.

Improving safety, infrastructure and economies

The project will ensure extreme floodwater can safely bypass OPG’s four Lower Mattagami River stations (Little Long, Smoky Falls, Harmon and Kipling generating stations) in the event of large-scale flooding in the area. It also helps OPG comply with updated requirements established by the Province of Ontario.

“The majority of the project involves heavy civil construction and provides employment & contracting opportunities for Indigenous communities, residents of Kapuskasing and Smooth Rock Falls and surrounding area. Procurement & employment will be undertaken by the project’s contractor.

Construction activities for 2020 include: site preparation (e.g., tree clearing, camp setup, barge landing installation), and rock excavation below Adam Creek sluiceway structure.

The project will help protect the assets improved in 2016 through the $2.6 billion Lower Mattagami River Project, which added capacity to Little Long, Smoky Falls, Harmon & Kipling generating stations and established an important partnership with the Moose Cree First Nation.

Our generation on Lower Mattagami River

Latest update


In April of 2020, on-site work was paused to assist in slowing the spread of COVID-19, in line with public health recommendations. On-site work was restarted in early June, in conjunction with the improvement of the COVID-19 outlook across the province.

Protocols remain in place to allow staff to continue to mitigate COVID-19, with enhanced measures in place. These protocols are based on the contractor’s industry-leading safe-work procedures which include site access restrictions, enhanced hygiene protocols, physical distancing measures, an on-site nurse and additional security staff. These measures ensure that we can maintain a balance between ensuring the safety and well-being of project staff, and continuing to power the economy.

For more information, please contact Christopher Lledo.

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Report Highlights:
  • Construction progress
  • Indigenous employment & engagement
  • Kiewit's Safety Rodeo on site