There are three major highway crossings of the Columbia River in the vicinity of the Tri-Cities, Washington, consisting of four distinct bridges. The US Army Corps of Engineers, The US Navy, and the National Oceanic and Atmospheric Administration required precise measurements of the height of these bridges above the water surface in the navigation channel. RSI provided these measurements using reflectorless total station technology, with redundant measurements taken from both sides of the river. The Columbia River is extremely wide in this area, meaning that the distances measured nearly reached the limits of the available technology, and the accuracies required left little room for error.

Conducting reflectorless survey of SR395 bridge