District 100, Montana

Dominated by the Purcell Mountains, with elevation ranging from approximately 1,976 feet along the Kootenai River corridor to 7,705 feet on higher ridges. Topography is characterized by steep, moderately to heavily forested drainages; cross-country travel is difficult throughout most of the district. The Yaak River and numerous tributary drainages shape the watershed. Public land within the unit is described as having approximately 80% of the area at slopes of 24 degrees or less, but the combination of dense canopy and drainage structure limits mobility and visibility.

Primary vehicle access follows US Highway 2 along the southern edge of the district (Libby to Troy corridor) and Montana Highway 37 along the east shore of Lake Koocanusa (Libby Dam north to Rexford). The interior of the district is accessed via an extensive network of approximately 3,000 miles of Kootenai National Forest logging and Forest Service roads, though motorized travel is restricted to designated routes on the Kootenai National Forest. The district falls within two USFS ranger districts: the Three Rivers Ranger District (Troy Ranger Station, 12858 US Hwy 2, Troy, MT 59935; 406-295-4693) covers the western portions including the Yaak drainage, and the Rexford/Fortine Ranger District (Eureka Ranger Station, 949 US Hwy 93 N, Eureka, MT 59917; 406-296-2536) covers the northeastern edge near Lake Koocanusa. No designated Wilderness areas fall within HD 100's legal boundary. The Kootenai Falls WMA (open year-round) provides additional public hunting access along the Kootenai River. Private land blocks are present but limited given the 89.2% public land composition; corporate timberland adjacent to FS lands may present some access constraints. A Libby CWD Management Zone exists within the southern portion of HD 100 (and portions of HDs 103 and 104). Hunters taking white-tailed deer within this zone are required to use the 199-20 license and submit deer for mandatory CWD testing within 10 days of harvest.

Dense conifer forest prevails, with mixed communities of lodgepole pine, Engelmann spruce, subalpine fir, Douglas-fir, western larch, and western red cedar. The modified Pacific maritime climate produces higher precipitation than the rest of Montana, supporting thick understory growth that significantly reduces visibility and makes still-hunting the dominant technique. Riparian corridors along the Kootenai River and interior drainages support cottonwood, alder, and willow. Over 100 lakes are distributed across the Kootenai National Forest. The Kootenai Falls WMA (172 acres on the Kootenai River, approximately 7 miles northwest of Libby) provides riparian winter-range habitat within the district boundary and is open year-round.

Elk occupy approximately 85% of the unit during spring, summer, and fall; the population is described by FWP as small but stable relative to the Purcell EMU objectives. Elk rut typically initiates in the first week of September. Both white-tailed deer and mule deer inhabit the district, with whitetails concentrated in riparian and lower-elevation mixed forest zones. Moose are present in riparian areas and are a huntable species. Black bears are widespread across the forested landscape. Mountain lions are present throughout the Kootenai National Forest. Gray wolves are present and subject to hunting regulations. Grizzly bears occur in the region but are not a huntable species. Lower game densities combined with extremely dense forest cover make locating animals difficult; animals frequently reach maturity due to low hunting pressure, and record-class individuals have been documented from this district.

1. Elk B-license quota for HD 100 antlerless elk was not definitively sourced; the Region 1 2024 elk report confirms antlerless B-license opportunity exists in HD 100. The specific license code and quota number should be verified against the current season regulations booklet. 2. Reported harvest of 84 elk (2024) is an FWP Harvest Survey estimate from the annual elk report, not a verified count. 3. The 2026 season structure reverts antlerless archery elk to brow-tined bull only in general/muzzleloader seasons; the PTHFV elimination proposal for R1 (including HD 100) was pending final commission adoption at time of research. 4. White-tailed deer reported harvest for HD 100 specifically was not broken out from regional aggregates. 5. No Cabinet Mountains Wilderness falls within HD 100's legal boundary. 6. Grizzly bear is present but federally listed and not huntable. 7. Mountain lion and wolf season-specific dates and quotas for HD 100 were not confirmed from sources fetched. 8. The 199-20 Libby CWD zone B-license applies only to the Libby CWD Management Zone sub-area within HD 100, not the entire district. CWD first detected in Libby area in 2019. 9. A West Kootenai WMA Dec 2 to May 15 closure was referenced in the source draft but could not be verified from available FWP web sources and has been removed pending confirmation.