About all of the Corps of Engineers of Kansas Dam/Spillways have a siren like this. Yes, I am aware it is used to notify people that water will rise fast, but I am unaware of the model. Wish I had a picture of the Hillsdale Lake siren on the spillway side. That thing last i remember was rusted as rusty could get!
http://maps.google.com/maps?ie=UTF8&oe= ... 0577042219
http://maps.google.com/maps?ie=UTF8&oe= ... 09398&z=17 Different lake, but much farther up. If you zoom in you can see it.