In British Columbia, survey work was overseen by Walter Moberly, a former Colony of British Columbia land official and cabinet member, and involved steamboat support vessels on the Arrow Lakes and Columbia River, and on Kootenay Lake, Shuswap Lake, Seton Lake and others. The survey entailed the first detailed mapping of much of southern British Columbia, including remote areas such as the Coast Mountains icefields and a range of potential pass and route combinations, including new discoveries - the most notable and crucial of which was Rogers Pass through the Selkirk Mountains, but also less famously but no less crucially Eagle Pass through the Monashees.