"Found coming out of a small hill. Water alternates between either side, going down each step."
A: "I believe this is the Lyon Creek – Cedar Way Stormwater Detention Dam. I contacted an engineer with the city because I was so curious about whether it was a fish ladder or not. They just got back to me and confirmed it is a fish ladder. They also sent an operation manual that includes some history and descriptions, very interesting."
"They're oil absorbing pads and since oil floats on water the tube is there to stop the oil from flowing while letting the water pass under it"
I had to visit reddit to look it up... I feel dirty.