The Sublette herd is the largest moose population in Wyoming, numbering approximately 1,800 individuals. This herd winters among the willow-dominated floodplains of the Green River Basin, primarily the eastern foothills of the Wyoming Range; some animals winter also in the Hoback Basin. As a partially migratory population, approximately half of the moose are resident, while migratory individuals travel short distances (14 miles on average, max 45 miles) primarily to tributaries of the Green and Hoback rivers. During spring, most migration routes originate on private ranchlands within the expansive willow bottoms of Beaver, Horse, Cottonwood, and Piney Creeks, as well as the aspen-conifer forests of the Hoback Basin. Migratory individuals typically travel upstream, within or near the same drainage that they spent the winter. During migration, moose encounter many fences, low-use county roads, and some must cross Highway 191 to reach their summer ranges. Migratory moose often arrive on summer ranges within the Bridger-Teton National Forest along the Wyoming Range front. Most summer ranges used by moose on the forest were withdrawn from oil and gas development due to the Wyoming Range Legacy Act passed by the U.S. Congress in 2009.
These data provide the location of migration routes for moose (Alces alces) in the Sublette herd in Wyoming. They were developed from Brownian bridge movement models using 91 migration sequences collected from a sample size of 41 animals comprising GPS locations collected every 2-8 hours.