Wood Duck eggs aren't usually blue, but I'm not sure about grackles, etc. Most likely not a waterfowl...
What birds have you seen in that area before?
ZBirdNerd
Year List (since 5/21):
Total: 90
This Week: Eastern Meadowlark, Cockatiel Parakeet, Northern Mockingbird, Snow Goose, Northern Rough-Winged Swallow
Favorites: Red-Headed Woodpecker, Eastern Phoebe, Black-Crowned Night-Heron