Lac Gagnon Water Aerodrome (IATA: YGA, TC LID: CTU4) was a seasonal water aerodrome located on Lac Gagnon, near Duhamel, in the Outaouais region of Quebec, Canada. The aerodrome was open from May until November each year, consistent with the operating season for water-based aircraft in northern climates.
The aerodrome was registered with Nav Canada and assigned the Transport Canada location identifier CTU4 and the IATA airport code YGA. It was situated at coordinates 46°07′03″N 075°06′55″W.
Lac Gagnon Water Aerodrome is listed as a defunct airport in the official List of airports in Quebec maintained by Nav Canada. The aerodrome is no longer in active service.
