Redhead said his own sister, a 32-year-old mother of four, killed herself earlier this month.
When there is one death by suicide in a community, it can often cause a "domino effect" in which more people attempt it, the chief said.
"We are concerned about that."
Crisis teams from Manitoba Keewatinowi Okimakanak, which represents northern First Nations, and Keewatin Tribal Council were heading to the community.
The chief called for immediate help from the federal government, including mental-health support specifically for children and teens.
Manitoba Health Minister Heather Stefanson said she would look into the state of emergency.
Redhead said a 12-year-old child committed suicide in 2019, the year he first took office. A lot of programs were brought in following the death, he said, but pressures have mounted with the COVID-19 pandemic.