The largest gathering of bald eagles anywhere on earth, on a river that stays open all winter because warm groundwater seeps up through a gravel fan.
Every place below is one an agency itself describes for eagle viewing, with that agency named and linked. Where a federal agency wrote something worth reading, its words are reproduced exactly, because a US government work is in the public domain. Where a state agency or a company is the source, the fact is in our own words with the source named.
Chilkat River, between highway miles 18 and 21
Four main pullouts along a few miles of highway, inside a 48,000 acre state preserve created for the eagles. One of them has a boardwalk and viewing platform with a telescope, a latrine and parking, and the state park agency asks people to use the pullouts rather than stopping on the road.
Run by Alaska Department of Natural Resources, Division of Parks and Outdoor Recreation
Chilkat River flats, highway miles 18 to 24
The state wildlife agency describes pullouts with restrooms, a viewing platform, interpretive signs and spotting scopes on the flats. It also lists the best months as October through February, which is the earliest window of any state in this inventory.
Viewing sites in Alaska, with the Corps of Engineers locks and dams in the state drawn underneath. The coloured grid is where people have uploaded a verified bald eagle record to iNaturalist in December, January and February, brighter where more have been logged. It is a map of reports, not of birds: it thickens around car parks, boardwalks and towns because that is where observers stand, and it thins over roadless country whether or not eagles are there. It shows past reports rather than birds present today. Pins are public viewing sites an agency itself describes; grey dots are US Army Corps of Engineers locks and dams, drawn because open tailwater below a dam is the reason most of these sites exist.
The window for Alaska is more than 3,000 birds between mid October and January, which the parks agency calls late autumn and early winter, according to Alaska Department of Fish and Game. That is a pattern across past winters rather than a forecast: how well a given year matches it depends on whether the water upstream actually freezes. A mild winter keeps the river open everywhere, the birds stay spread out, and the concentration this page is about never forms.
Time of day is the more reliable lever in any case, and it is the one thing every agency agrees on. The federal management guidance describes when eagles feed, and it is not the middle of the day.
“Avoid recreational and commercial boating and fishing near critical eagle foraging areas during peak feeding times (usually early to mid-morning and late afternoon), except where eagles have demonstrated tolerance to such activity.”US Fish and Wildlife Service, National Bald Eagle Management Guidelines, May 2007. A US government work, in the public domain, quoted exactly.
Read that as a viewing instruction rather than a boating one. The birds come off the roost hungry, fish hard in the first hours of light, and then spend the middle of the day sitting in a tree digesting, which looks exactly like an empty river to somebody who arrived at eleven. Late afternoon gives you a second, shorter window as they feed again before going back to roost.
Alaska is on this list with a correction attached, because the obvious framing is wrong. The Chilkat gathering near Haines is the largest concentration of bald eagles anywhere in the world, and it is not a December to February story and has nothing to do with a dam. The state wildlife agency puts the 3,000 bird congregation between the middle of October and January, and the state parks agency calls the peak late autumn and early winter. The mechanism is beautiful and entirely natural: an alluvial fan of gravel below the confluence of three rivers stores summer meltwater and seeps it back out above freezing all winter, so a stretch of the Chilkat never ices over, and a late run of chum salmon arrives in exactly that stretch when everything else in the region has frozen. Anyone planning a Haines trip on a lower 48 January calendar will arrive after the best of it.
Below is a reading of a public platform rather than a survey. It counts the research grade bald eagle observations members of the public have uploaded to iNaturalist for this state, by calendar month, across every year the platform holds. It is a count of reports. It measures how many people were out with a camera as much as it measures birds, so the shape is worth reading and the absolute numbers are not.
Reading the Alaska observation record from iNaturalist...
Checking the most recent winter upload for Alaska...
A staffed event is the easiest possible introduction to this: somebody has already found the birds, set up a scope on them and can tell you what you are looking at. Most agencies publish the dates only weeks ahead, so what follows names the organiser and the recurrence, and the organiser’s page carries the current date.
Each November, during the largest gatherings
Guided naturalist trips into the preserve, wildlife exhibits and presentations, run by a nonprofit foundation rather than by an agency.
The state agency names the month but publishes no dates, and the festival is not an agency event. Read the agency description: The state wildlife agency describes a festival run by a nonprofit foundation in Haines
Inventory compiled 2026-09-04 from the agency pages linked above. Federal text is quoted exactly because a US government work is in the public domain; state agency, nonprofit and company material is restated in our own words with the source named and linked.