The Colville River cathodic protection (CP) system is unique in many ways. The cased pipelines are isolated from the CP system and are directionally drilled 85 feet (26 m) below the river surface. Both thawed soils under the active channel and frozen soils under the floodplain
and riverbanks characterize the crossing. These conditions make for differential thermal and soil resistivity states over time. The CP system is designed to protect the casings from external corrosion, and must function in a very dynamic and aggressive environment. Conventional reference electrodes were unsuitable for monitoring the CP system, and custom steel reference electrodes were installed. The 100 mV
Polarization criterion will be used to judge the performance to the CP system.
Key words: impressed current, steel anode, steel reference electrode, casing, arctic, remote monitoring, permafrost, cathodic protection, 100 mV polarization