(template stolen from Crow Time comic)
That's neat! We just have a sign on the river, and people guess when the ice will start moving. More precisely, when the sign will pass under the bridge. A dummy would definitely be more fun, but some teenagers would probably steal or break it... or someone would mistake it for someone drowning in the spring as it travels towards the sea. Maybe it's better to just stick to the sign.
Gandalf said he wasn't interested, so Saruman locked him in the attic. "He'll learn to love me eventually."