The first survey of odonate diversity at the newly established Glacial Ridge National Wildlife Refuge in northwestern Minnesota was conducted. All diversity data were used to construct a community species pool for the study site. At more than 9,700 hectares, Glacial Ridge is the largest prairie and wetland restoration in U.S. history. The study area is a mosaic of prairie wetland habitats which include wet and mesic grasslands, willow thickets, sedge meadow, and aspen woodlands. Prior to this study, odonates in northwest Minnesota were poorly surveyed and until now, few studies have utilized the species pool hypothesis to examine insect biogeography. The species pool hypothesis states that, all else being equal, habitats that are larger and older have higher speciation rates and therefore more species adapted to that habitat type. From May through September 2006, 30 odonate species were collected from Glacial Ridge. Regional Odonata locality data were also collected from U.S. and Canadian entomological collections and used to model a hypothetical regional species pool for the northern tall grass prairie eco-region. Important features of the modeled species pool are also presented.