World’s largest congregation of eagles begins in B.C.

The world’s largest congregation of bald eagles happens on the river in the little community of Harrison Mills

Along the Harrison River in B.C.’s Fraser Valley, thousands of eagles are gathering to gorge on salmon that have reached the spawning ground.

David Hancock, a biologist who has been studying eagles for about 65 years, says the world’s largest congregation of bald eagles happens on the river in the little community of Harrison Mills, about 100 kilometres east of Vancouver.

“Last Saturday morning I did a survey off the river and there were just over 7,000 eagles in the area,” he said in a recent interview. “This is the most we’ve ever had in November.”

About 35,000 eagles gather in the lower Fraser Valley between November and February, and some days about 2,000 to 3,000 raptors move in, Hancock said.

“It’s the biggest single accumulating area because the Harrison River is the single most productive river,” said Hancock. “It’s the only river in Canada called a salmon stronghold river.”

The Harrison River is a tributary of the Fraser River and runs about 18 kilometres in length.

READ MORE: Fraser Valley Bald Eagle Festival explodes in popularity, draws thousands to Mission, Harrison Mills

READ MORE: Record-breaking bald eagle numbers predicted in Harrison Mills this fall

As rivers in Yukon, Alaska and northern British Columbia ice up food supplies freeze too, which forces the eagles south.

“Our salmon are just beginning to die so the table is set down here,” said Hancock.

But there are other factors that contribute to the number of eagles that descend on the area.

“Sometimes the north doesn’t freeze up and the eagles don’t need to come,” he added. “Some years we don’t get as many salmon so the table isn’t as generously set.”

The eagles remain in the area until February although a few thousand may fly further south into Washington, Oregon and California as winter deepens.

Hancock said this year, the Harrison River does not have enough salmon.

“This was not a good year for spawning,” he said.

When the salmon carcasses are gone, he said the eagles feed on spawned herring and oolachin, a smelt.

In about four years the area might not see as many eagles because overharvesting means there won’t be as many salmon carcasses for them to feed on, he said.

Hancock said in the last two decades researchers have learned about the connection between the huge trees in forests in the area and spawned salmon. The carcasses of spawned salmon give nutrition to the soil, he added, which helps trees grow.

“Without those salmon there are no big forests,” Hancock said. “That’s the lesson we learned in the last 20 years of ecology.”

The Canadian Press

Like us on Facebook and follow us on Twitter.

Just Posted

What’s happening for Family Day in the Boundary

Activities in and around Grand Forks offer something for everyone.

Biologists discover another female calf in depleted South Purcell Mountain Caribou herd

Calf will be moved to Revelstoke maternity pens, then released

Petition on Second Street project presented to council

Over 1,000 signatures were gathered, but staff say council can’t do much about the project.

Man seriously hurt after police shooting near Nelson

Incident has been reported to provincial police watchdog

Mental health, BC Housing council’s picks for resolution issues

Grand Forks council aims to hold the province accountable to local government with draft resolutions

VIDEO: Canada’s flag turns 54 today

The maple leaf design by George Stanley made its first appearance Feb. 15, 1965

Judge rules Abbotsford home must be sold after son tries to evict mom

Mom to get back down payment and initial expenses

Trump officially declares national emergency to build border wall

President plans to siphon billions from federal military construction and counterdrug efforts

Snow turns to slush, rain as it warms up across B.C.’s south coast

Some areas are already covered by more than half a metre of snow following three separate storms

Father to be charged with first-degree murder in Amber Alert case

11-year-old Riya Rajkumar was found dead in her father’s home in Brampton, Ontario

Police track armed kidnapping across Thompson-Okanagan

RCMP allege it was a targeted crime believed to be linked to the drug trade

St. Paul’s Hospital replacement slated to open in Vancouver in 2026

Announced many times, but this time there’s money, Adrian Dix says

Fourteen ‘dream’ homes ordered evacuated as sinkholes open in Sechelt

Sinkholes throughout the subdivision have prompted the District of Sechelt to issue evacuation orders

Olympian Rhoda Wurtele visits Fernie; reveals secret to skiing at 97

Rhoda Wurtele and her identical twin sister Rhona represented Canada at the 1948 Olympics

Most Read