Unit 39

Major summits including Lucky Peak, Mount Maria, and Hawley Mountain provide key glassing vantages and navigation landmarks. The Boise Ridge, Banner Ridge, and Hungarian Ridge form major terrain divisions useful for route planning and orientation. Critical water sources include Cold Spring, Frenchman Spring, and Cottonwood Springs scattered throughout the drainage network.

Named creeks—Robbs, Porter, Slater, and Charcoal—mark valleys and provide both water and natural travel corridors. The Jim Creek watershed divide and South Fork Boise River divide form prominent topographic breaks hunters can key off when navigating the more complex terrain.

Terrain transitions dramatically from lower foothills near 2,500 feet to high alpine ridges exceeding 10,000 feet, with most of the unit clustering around mid-elevation zones. Lower elevations feature open sagebrush benches and scattered ponderosa pine, while mid-elevation slopes support mixed conifer forests of Douglas fir and lodgepole pine. Higher elevations transition to subalpine timber and alpine meadows near the major summits.

The moderate forest coverage across the unit creates varied habitat—open glassing country interspersed with timber where deer shelter and move. This elevation diversity compresses multiple habitat zones into a relatively compact geography.

Well over 3,400 miles of roads thread through the unit, providing fair to good access via Forest Service routes and Highway 20, which bisects the lower unit. This connected road system means relatively easy truck access to mid and high-elevation country, creating predictable hunter concentration along main corridors and trailheads. However, the steep terrain and elevation gain force most pressure into narrow bands—hunters often don't penetrate far from roads.

The complexity and steepness (7.9/10) of the surrounding country provides refuge for hunters willing to climb into less accessible ridges and side drainages away from obvious parking areas.

Unit 39 encompasses portions of Ada, Boise, and Elmore Counties, spanning the upper Boise River drainage and surrounding ridgelines. The unit begins near Interstate 84 near Boise and extends northeast across Anderson Ranch Dam Road, following major watershed divides that separate the Middle and South Forks of the Boise River from the Big Wood River drainage. The eastern boundary follows the Camas-Blaine County line along high ridge country, while the western edge traces back to Highway 21. This placement puts the unit directly behind the Boise metro area, making access straightforward despite the rugged terrain.

Water availability is limited, a critical consideration for this unit. Reliable springs scattered across mid to high elevations provide the most dependable sources—focus on Cold Spring, Frenchman Spring, and Cottonwood Springs as reference points. Major creeks including Robbs, Porter, Slater, and Charcoal run seasonally with better flow through spring and early summer but may diminish by late season.

The South Fork Boise River and Middle Fork drainages mark major geographic divides but sit in canyons difficult to access during most hunts. Secondary springs and seeps become increasingly important in drier months, making thorough reconnaissance essential before hunting.

Unit 39 is white-tailed deer country primarily, with deer using the moderate timber patches as cover while foraging in open meadows and sagebrush benches. Early season hunting focuses on higher-elevation draws and ridges where deer concentrate in cooler timber. Mid-season activity shifts toward mid-elevation transitions between forest and open country, particularly around the scattered summits and ridge systems.

Water sources become critical late season—glass and hunt within reasonable distance of springs, especially Frenchman Spring and Cottonwood Springs areas. The steep terrain means vertical hunting; glassing from ridge tops in morning light, then working into timbered drainages during day. Plan water strategy carefully given limited sources; pack extra capacity.