Every winter, a significant number of bald eagles migrate to the lower Fraser Valley, creating the largest congregation of eagles worldwide. The annual spectacle takes place along the Harrison River, where migrating salmon attract eagles from as far as Alaska and Yukon. This seasonal feeding ground for the birds lasts from November to February when northern lakes and rivers freeze, forcing the eagles to head south to escape the harsh winter conditions.
According to bald eagle researcher David Hancock, an estimated 35,000 to 50,000 birds pass through the region each winter. With the salmon run currently at its peak, experts suggest that the conditions are ideal for the eagles. Ornithologist Rob Butler mentioned that during months when the rivers lack sufficient salmon, the eagles move to the coast along the Salish Sea to hunt ducks for the rest of the winter.
The Harrison River’s abundant salmon population makes it a preferred location for the eagle migration. Butler and Hancock both highlight the remarkable recovery of bald eagle populations since the mid-20th century when the species faced a decline due to the effects of the pesticide DDT. The eagles play a crucial role in maintaining the ecosystem of the Harrison River by scavenging salmon carcasses and regulating fish and duck populations.
Aside from their ecological importance, the eagles also attract tourists and birdwatchers to the area. The Harrison Eagle Festival has become a popular event for those interested in observing and photographing these majestic birds. Visitors, such as Dan Woodstra, express awe at the sight of the eagles in their natural habitat, describing it as a magical experience.
Experts predict that the eagles will stay in the region until February before embarking on their journey back north. The presence of these iconic birds not only enhances the local ecosystem but also boosts tourism, making the annual eagle congregation a significant event for both nature enthusiasts and the community.