Earth Syst. Sci. Data, 12, 1835–1860, 2020 https://doi.org/10.5194/essd-12-1835-2020 © Author(s) 2020. This work is distributed under the Creative Commons Attribution 4.0 License. A Canadian River Ice Database from the National Hydrometric Program Archives Laurent de Rham1, Yonas Dibike1, Spyros Beltaos2, Daniel Peters1, Barrie Bonsal3, and Terry Prowse1 1Environment and Climate Change Canada, Watershed Hydrology and Ecology Research Division, 3800 Finnerty Rd., Victoria, BC, V8P 5C2, Canada 2Environment and Climate Change Canada, Watershed Hydrology and Ecology Research Division, 867 Lakeshore Rd., Burlington, ON, L7S 1A1, Canada 3Environment and Climate Change Canada, Watershed Hydrology and Ecology Research Division, 11 Innovation Blvd., Saskatoon, SK, S7N 3H5, Canada Correspondence: Laurent de Rham (
[email protected]) Received: 10 February 2020 – Discussion started: 31 March 2020 Revised: 22 June 2020 – Accepted: 25 June 2020 – Published: 24 August 2020 Abstract. River ice, like open-water conditions, is an integral component of the cold-climate hydrological cycle. The annual succession of river ice formation, growth, decay and clearance can include low flows and ice jams, as well as midwinter and spring break-up events. Reports and associated data of river ice occurrence are often limited to single locations or regional assessments, are season-specific, and use readily available data. Within Canada, the National Hydrometric Program (NHP) operates a network of gauging stations with water level as the primary measured variable to derive discharge. In the late 1990s, the Water Science and Technology Directorate of Environment and Climate Change Canada initiated a long-term effort to compile, archive and extract river- ice-related information from NHP hydrometric records.