Trisha called to say that one eagle is now sitting very low in the nest and remained there over a two hour period of observation. This is very likely a sign that she is incubating. She may be hard to see, so visitors should take pains to see if she continues to sit low. This would be an earlier egg date than the past two years.
Tom Mitchell sent these photos of his from today, for posting.
You can barely see her peering out between the nest materials:
Photos courtesty of Tom Mitchell