Ste-Marguerite Water Aerodrome

The closure was due to administrative and economic reasons, specifically the dissolution of its operating entity, the Aéro-Club Estérel Inc. When the flying club ceased to exist, there was no longer an organization to maintain the aerodrome's registration, facilities, and operational compliance with Transport Canada regulations. There is no evidence to suggest the closure was caused by a specific accident, military conversion, or environmental issue.

The site of the former aerodrome is Lac Masson itself. The location is no longer a registered or published aerodrome with Transport Canada, and the identifier CA-0573 is inactive. There are no longer any dedicated docks, fuel services, or ground facilities associated with the former aerodrome. The lake is used for public recreation, including boating, swimming, and fishing. While it is generally legal in Canada for a qualified pilot to land a private floatplane on a public body of water like Lac Masson (subject to local bylaws and safe operating practices), it is done without the support or official status of a registered aerodrome.

Ste-Marguerite Water Aerodrome was a registered seaplane base on Lac Masson, serving the popular Laurentian tourist region. Its primary operator was the Aéro-Club Estérel Inc., a local flying club. The aerodrome's operations were centered on general aviation and recreation, likely including:
- Floatplane flight training for student pilots and licensed pilots seeking a seaplane rating.
- Recreational flights for club members.
- Potentially offering local sightseeing tours to tourists visiting the Sainte-Marguerite-du-Lac-Masson and Estérel resort areas.
Its significance was local, supporting the vibrant aviation culture of the Laurentians, which has a long history with floatplane operations for accessing remote lakes and cottages.

There are currently no known public plans or active proposals to reopen a registered water aerodrome at this location. Re-establishing an official aerodrome would require a new proponent to invest in facilities and navigate the complete regulatory approval process with Transport Canada and the municipality of Sainte-Marguerite-du-Lac-Masson. Given that more than two decades have passed since its closure, the prospect of reopening is considered very low.