Because of their small size and proximity to nutrient-rich, well-oxygenated, flowing waters, instrumentation devices such as gauging stations, transducers, and piezometers are susceptible to zebra mussel infestations. These measuring devices are installed along waterways to record surface water elevation, velocity, and flow. Infestation of the intake pipe between water source and measurement device leads to erroneous readings and incorrect conclusions regarding project conditions. The added weight of zebra mussels on gage well floats leads to inaccurate recordings.
Personnel should inspect gauging station intakes, stilling wells, and floats carefully at least once a year when water temperature is greater than 12 °C. The outer portion of the intake should be examined. If infestations are not observed on the outer portion of the intake, zebra mussels are unlikely to exist farther up the chamber or within the still well. These interior areas are not generally suitable for zebra mussels because they are usually stagnant and lack sufficient levels of dissolved oxygen. Zebra mussels can be removed with a wire brush, high pressure water, scrapers, or other physical means. Surfaces can be coated with antifoulants to control and prevent zebra mussel infestations. Doses of chlorine can effectively minimize infestations within the well and intake piping; however, coordination with local water quality regulators is necessary before use of chemicals.