Unit 10Z, Alaska

Northern half is the Tanana Flats lowland — a vast boreal taiga wetland mosaic of black spruce bogs, willow-sedge meadows, shallow lakes, and birch-aspen stands at 350–1,000 ft elevation; snowpack typically stays below 32 inches allowing good winter access. Southern half transitions abruptly into the northern foothills and front ranges of the Alaska Range, rising to 14,000 ft. A patchwork of post-fire successional forest (approximately 700,000 acres burned 2001–2013) has improved moose forage across a large portion of the flats. Rivers include the Nenana (west boundary), Tanana (north), and Delta (east), all heavily glacially silted.

Unit 20A is one of Interior Alaska's more accessible remote units. The Parks Highway (AK-3) forms the western boundary corridor through Nenana; the Richardson Highway skirts the southeastern edge near Delta Junction. The Rex Trail ATV route penetrates from the Parks Highway into the heart of the Tanana Flats and is the primary non-aircraft route into the interior country. Multiple remote airstrips are scattered throughout (Gold King, Yanert, and others) and are heavily used by guides and local bush pilots. The Nenana and Tanana rivers provide boat and airboat access to flats country. Floatplane access from Fairbanks (~30 min) opens backcountry efficiently. Fort Wainwright military reservation occupies a substantial block of the northern flats — Army impact areas are permanently closed to hunting; call (907) 361-9686 for current boundaries. Wood River and Yanert Controlled Use Areas prohibit motorized vehicles (except aircraft) Aug 1–Oct 31. Delta Controlled Use Area prohibits motorized land vehicles for hunting Aug 5–25. Public land is approximately 90–95% of the unit (State of Alaska, BLM, Tanana Valley State Forest, and Denali National Park foothills). Interior Alaska generally lacks federal subsistence priority zones in this unit outside Native allotments; the Fairbanks Nonsubsistence Area (FNSA) applies to portions of the unit.

Classic Interior Alaska boreal forest (taiga): black spruce bogs, white spruce-birch uplands, willow-alder riparian corridors, sedge-grass meadows, shallow tundra ponds, and muskeg on the northern flats. Recent large fires (2001–2013) regenerated high-quality willow/aspen shrub moose browse across roughly 700,000 acres. Southern unit grades into subalpine shrub tundra, alder krummholz, and exposed alpine tundra on upper Alaska Range ridges and peaks. Climate is classic Interior continental: summers reach 80°F, winters −40°F.

Moose are year-round residents at moderate-to-high densities (2.0–2.5/sq mi), concentrated on the Tanana Flats willow-spruce lowlands; bulls move to foothills in summer and return to flats in fall rut. The Delta caribou herd (DCH, ~3,000 animals) makes seasonal movements across a 5,125 sq mi range primarily within 20A, mixing with Nelchina herd animals in Unit 13 during some fall surveys; herd peaked at nearly 11,000 in 1989, declined to ~3,000 by 2001, and has been managed via limited drawing permits since 1996. Dall sheep number ~1,800 animals in the Alaska Range foothills and mountains of the southern unit. Black bears estimated 500–700 animals on the Tanana Flats. Grizzly bears are present throughout. Wolves are managed under a former intensive management predator control program (now expired — control was halted because moose are at high density and nutritional condition was poor due to overbrowsing).

Subsistence: Unit 20A outside the FNSA carries a customary-and-traditional-use finding for moose; ADF&G target is 50–75 moose as the subsistence-priority amount. The FNSA (Fairbanks area) is a designated nonsubsistence area where all hunters follow sport regulations. Nonresident moose hunters must complete the Nonresident Moose Hunter Orientation course before hunting. Nonresidents must be accompanied by a licensed guide for grizzly/brown bear and Dall sheep. Army impact areas are permanently closed — call (907) 361-9686 for boundary info; unexploded ordnance may be present in portions of 20A. Caribou DC827 is residents-only (R) with up to 25% allocation to nonresidents as of RY21; nonresidents (N) have a separate drawing permit DC828. The Fortymile/White Mountains caribou hunts (RC860, RC867) apply to other 20-series units but NOT 20A (Delta herd only). 2% annual draw odds for DC827 caribou permit make this one of Alaska's most oversubscribed caribou tags. Moose are Intensive Management-designated; antlerless hunts have been used in recent years to stabilize an over-objective population. Bison (Unit 20D, not 20A) are in adjacent Bison Range. Muzzleloader season DM766 runs Nov 1–Dec 15 for bulls in 20A.