In 1900, Quebec had an estimated 1,000 covered bridges. Relative to the rest of North America, Quebec was late in building covered bridges, with the busiest decade for construction being the 1930s. Initially, the designs were varied, but around 1905, the design was standardised to the "Town québécois", a variant on the lattice truss patented by Ithiel Town in 1820. The designer is unknown. About 500 of these were built in the first half of the 1900s. They were often built by local settlers using local materials, according to standard plans. The last agricultural colony was founded in 1948, and the last bridge was built by the Ministry of Colonisation in 1958 in Lebel-sur-Quévillon. There are now 82 covered bridges in Quebec, Transports Québec including the Félix-Gabriel-Marchand Bridge, the province's longest covered bridge. In Quebec covered bridges were sometimes known as "pont rouges" (red bridges) because of their typical colour.