Wisconsin Walloon is a heritage dialect of a threatened language in the langue d'oïl family that originated in southern Belgium and expanded to northeastern Wisconsin, USA in the mid-1850s. Walloon-speaking immigrants formed an isolated agricultural community, passing on and using the language for the next two generations until English became the dominant functional language. Although younger generations today have not learned the language, there remain enough Walloon speakers as well as Belgian descendants interested in their linguistic heritage to have generated community support for a Walloon documentation and conservation project. In this paper, we report on the results of over three years of collaboration between university researchers, students, and community members to document, study, and promote the language for the benefit of both scholars and community. We provide a description of the language, collaborative documentation efforts, and the development of community resources, including a phonetically-accessible Walloon orthography. We conclude with an outlook on future work with an eye toward increased community-led efforts.