The Canadian Arctic Archipelago hosts a cluster of ice caps and ice fields that amount to 14% of Earth’s total glaciated area. However, this body of ice is losing considerable mass from warmer seawater eroding its marine margins and intensified summer atmospheric forcing melting its surface, making it a significant contributor to global sea level rise to be considered alongside Greenland and Antarctica. Milne Fiord of Ellesmere Island is the last perennially ice-covered Canadia fjord that hosts an epishelf lake bordered by a detached glacier tongue and a relict ice shelf. This ice configuration is breaking up, with signs of total collapse and seasonal open water within the next decade. Here, we present in situ measurements of hydrographic physical and chemical properties, collected in 2024, distributed throughout the fjord from the glacier grounding line, in the epishelf lake, and offshore. These data provide first-hand measurements of freshwater sources and pathways in the ocean once it is discharged from the land ice remaining in the Canadia Arctic Archipelago.