The First Nations Leadership Council (FNLC) is demanding all levels of government declare a state of emergency as communities fear devastating consequences following the Big Bar landslide into the Fraser River north of Lilooet, B.C.
Calling it an urgent matter, council is also asking officials to remove any remaining obstructions at the site of the landslide within the next 60 days.
The call for action comes days after CBC reported federal scientists feared some Fraser River salmon populations could be wiped out completely following the slide.
"I think it requires more political will," said Terry Tegee, B.C. regional chief for the Assembly of First Nations. "We wanted to raise this issue to a high level, to not only the [Department of Fisheries and Oceans] DFO, but to the prime minister and also to high-level people within the provincial government."
The Big Bar landslide created a five-metre waterfall on the Fraser River north of Lillooet around October and November last year, making it impossible for migrating salmon to push through to their natal streams.
In an attempt to save this year's runs, more than 60,000 fish were captured, stored in tanks, and then lifted past the obstruction by helicopter over the summer. Others managed to swim past after water levels fell.
But despite those efforts, this year's returns are looking grim.
In its letter, the FNLC also wants to see a working group put in place that includes representatives from impacted First Nations.
The group would be in charge of monitoring the cleanup efforts, as well as creating contingency plans for those affected.
More calls for action
Last month, the Tsilhqot'in Nation declared a state of local emergency as a result of the slide.
In a letter sent to Jonathan Wilkinson, the minister of fisheries and oceans at the time, Chief Russell Myers Ross said the slide had resulted in a food security crisis for his communities.
Ross claimed the DFO had not conducted the work necessary to mitigate the slide before the next year's salmon runs.
Since the Tsilhqot'in Nation's letter was sent last month, Minister Bernadette Jordan has taken over the portfolio, which Tegee says gives council hope.
"We've let her know our high-priority issues," Tegee said after meeting with Bernadette. "She told us she would definitely follow up."
CBC News has reached out to the provincial and federal governments for comment.