Last updated: April 10, 2015
Every year the Arch turns out the lights for the migrating birds during the spring and fall migrations as the bright light at night throws off the passing birds and can interupt the natural flow of the semi annual migration.
On slow days at the top of the Arch I have often seen many flocks of geese, ducks,herons, egrets and UFOs as well as a steady stream of bald eagles... its always a thrill to be looking DOWN on a passing eagle!
So if your moving around downtown at night in late September ( in the spring too! ) and wondering where the Arch went - its lights out for the birds.