A third source, neither the ministry census nor OpenStreetMap: what the town itself publishes. It is the only one that says where a facility came from, who built it and what it cost.
Mésanger's pumptrack was requested by the town's youth council and set by the lake alongside other open-air equipment, including a teqball table. The town describes it as free to use and open to all ages.1
It cost 105,348.01 euros excl. tax, funded by a 34,004-euro fonds de concours, a 21,038-euro grant under the Plan 5000 local sports-facilities scheme, and 50,306.01 euros from the town's own budget. The Pays d'Ancenis Cyclisme club runs supervised slots there on Saturday mornings.1