Seattle Public Utilities' Project Surveyor Gavin Schrock inspects tilt sensor components on a Tolt Dam monitoring station. The delicate components will be enclosed in weatherproof housings. These sensors gather and correlate tilt-sensor data with receiver observations. If motion by a receiver is accompanied by tilting, this indicates the earthwork — not the entire dam — is moving. Photos: Seattle Public Utilities
This dome contains the antenna for a Continuously Operating Reference Station operating near Tolt Dam in the Seattle region. It is part of a permanent installation used to monitor dam movement.