The only state wildlife agency that publishes a viewing season for each individual site, which is how you learn that half of them are not winter sites at all.
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.
Susquehanna River, from Chickies Rock down to the state line
The state agency calls this a major area for nesting, migration and wintering, and gives it the only all seasons rating on its list. It names a string of public access points and overlooks along the river, including county park overlooks and a boat launch, and says eagles may be spotted from any of them.
Run by Pennsylvania Game Commission
Delaware River
The one site on the state list whose published best season is winter outright. A big undammed river through a gap in a ridge is a different mechanism from a tailwater: the current keeps it open, and the ridge gives the birds lift.
Run by Pennsylvania Game Commission
Raystown Lake, a Corps of Engineers reservoir
Listed by the state agency with a year round viewing season rather than a winter one, which is worth taking at face value: a deep Corps reservoir holds eagles all year and does not produce the dramatic midwinter pile up that a river tailwater does.
Run by Pennsylvania Game Commission names it; the lake is a US Army Corps of Engineers project
Viewing sites in Pennsylvania, 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 Pennsylvania is all seasons on the lower Susquehanna, which the agency describes as a major area for nesting, migration and wintering, according to Pennsylvania Game Commission. 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.
Pennsylvania does something no other state wildlife agency does, and it is quietly the most useful page in this whole inventory. For each of its ten named eagle viewing sites it publishes a field called best eagle viewing season, and fills it in for each. Two sites read year round. One reads winter. One reads late winter into spring. And two of them, including one of the best known parks in the state, read spring and summer and are therefore the wrong place to drive to in January. Almost every other state publishes a single seasonal sentence covering everywhere, which quietly implies that all its sites work in all its seasons. Pennsylvania publishes the variation, and the variation is the information.
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 Pennsylvania observation record from iNaturalist...
Checking the most recent winter upload for Pennsylvania...
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.