Unit 17B, Alaska

Mountainous tundra and boreal transition zone. The northern reaches include the Mulchatna Mountains and Nushagak Hills with peaks exceeding 7,000 ft near Lake Clark on the eastern boundary. Mid-unit terrain is rolling upland tundra and spruce-birch forest. Lowlands along the Nushagak and Mulchatna river corridors feature dense willow, alder, and cottonwood riparian strips transitioning to open tundra. The Wood River drainage in the south contains lake systems and wetlands. Vegetation runs from alpine tundra on summits down through spruce-birch boreal forest to wetland/lake habitat in the south.

No road access. The unit is reached exclusively by floatplane (wheeled, float, or ski) or by riverboat via the Nushagak River system. The nearest hubs are Dillingham (~50–100 miles south) and King Salmon (~70 miles southeast). Charter air services operate from both communities. Motorized ground vehicles (ATVs, snowmachines during Aug 1–Nov 1) are prohibited for hunting big game under the Upper Mulchatna Controlled Use Area regulations. Boats are permitted on rivers year-round. Public lands include portions of Lake Clark National Park and Preserve on the eastern edge and Togiak National Wildlife Refuge in the western reaches; the bulk of the unit is state land. Public land percentage approximately 95%.

Three main habitat zones: (1) alpine tundra — dwarf shrub, sedge, and lichen above treeline (~2,000 ft+), primary caribou summer range; (2) boreal forest transition — white spruce, paper birch, alder, and cottonwood at mid-elevations and along river corridors, core moose habitat; (3) lowland wetland/lake complex — sedge meadows, willow flats, and lake-margin habitat throughout the Wood River and lower Nushagak drainages. Expanding willow growth driven by climatic warming has enhanced moose habitat quality since the 1990s.

The Mulchatna Caribou Herd (MCH) uses Unit 17B as its traditional calving ground (upper Mulchatna River, May–June). The herd, comprised of East-MCH and West-MCH subgroups plus the smaller Cape/Goodnews group, ranges widely across Units 9, 17, 18, and 19 throughout the year. As of 2025, herd population estimate is 16,276 (minimum count 13,475), up 30.1% since intensive management began in 2023. The herd peaked at ~190,000 in 1997 and declined 94% by 2019; it has been closed to all caribou hunting since 2021. A 2023 moose population survey found 3,600 moose in Unit 17B, above the management goal of 2,800–3,500. Brown and black bears are subject to active predator control in a 3,000-sq-mile zone within the unit targeting bear and wolf predation on MCH calves; 200+ bears removed in 2023–2024. Calf-to-cow ratio for West-MCH reached 54:100 in 2024, highest since 1999.

CARIBOU: MCH closed to ALL hunting (residents and nonresidents) since 2021 — no open season. Unit 17B is under an active Intensive Management Plan (IM Plan, revised 2022, amended July 2025) to recover the herd to the 30,000–80,000 population objective. Board of Game predator control program (bears + wolves) authorized through spring 2028. MOOSE: Nonresidents may hunt Unit 17B moose by Registration Permit (hunt RM587, Sept 5–15) — legal bulls must have 50-inch antlers or 4+ brow tines on at least one side; permits available in person in Dillingham July 8–Sept 4. Residents may hunt by Registration Permit RM583 (Aug 20–Sept 15, one bull) or Harvest Ticket (Sept 1–15, spike-fork/50-inch/3+ brow tines). Additional resident Registration Permit RM585 for antlered bulls may be announced. Nonresidents do NOT require a guide for moose in Unit 17 (not a brown bear unit requiring guides) but must complete Nonresident Moose Hunter Orientation course. NONRESIDENT CLOSED AREA for caribou: 2-mile corridors along Nushagak River (southern boundary to Chichitnok River), Mulchatna River (to mouth of Chilchitna), Nuyakuk River (to falls), Koktuli River (to Swan River mouth), and Stuyahok River (to North/South Fork confluence) — nonresidents may not take caribou in these corridors (currently moot as all caribou hunting closed). MOTORIZED VEHICLES: Upper Mulchatna Controlled Use Area covers all of Unit 17B — no motorized vehicles (except aircraft and boats) for hunting big game Aug 1–Nov 1. BROWN BEAR: Nonresidents must be accompanied by a licensed guide. Bag limit 2 bears per regulatory year, no closed season (B — residents and nonresidents). Federal regulations apply on Lake Clark NP&P and Togiak NWR lands.