JUST PUBLISHED: GRIZZLY BEARS AND US HWY 93N ON THE FLATHEAD INDIAN RESERVATION, MONTANA
Adams, P.J., M.P. Huijser & S.C. Getty. 2023. An assessment of existing and potential future mitigation measures related to grizzly bears along US Highway 93, Flathead Indian Reservation, Montana, USA. Confederated Salish and Kootenai Tribes, Pablo, Montana, USA.
The purpose of this report is to provide recommendations for mitigation measures along US Highway93 North on the Flathead Indian Reservation. The measures are aimed at:1.Reducing direct road mortality for grizzly bears, and 2. Allowing for connectivity for grizzly bears between the areas on both sides of the highway. The recommendations are for: 1. The 11.6 mile-long (18.7 km) road section between mile reference post 36.8 and 48.4 (from just south of “Post Creek”, north of St. Ignatius until just north of Ronan) which has not been reconstructed yet (as of January 2023), and 2.The other road sections that have already been reconstructed and (partially) mitigated, but where adaptive management may increase the effectiveness of the mitigation measures for grizzly bears.The recommendations are based on a literature review, as well as existing data on roadkilled grizzly bears, the use of existing wildlife crossing structures by grizzly bears, road crossing locations of GPS collared grizzly bears, traffic volume, and economics associated with collisions and mitigation measures.