Unit 45, Colorado

GMU 45 occupies steep, densely forested mountain terrain stretching from the Eagle River valley floor (roughly 7,500–8,500 ft) up through the Sawatch Range to the Continental Divide and peaks above 14,000 ft (Mount of the Holy Cross at 14,005 ft is within the Holy Cross Wilderness in the western portion of the unit). The unit's boundaries run: north along the Eagle River from East Lake Creek to Dowd Junction, then I-70 from Dowd Junction to the Eagle River–Tenmile Creek Divide; east along that divide; south along the Continental Divide; and west along the divide separating the Chance Creek–North Fork Frying Pan–Cunningham Creek drainages from the Cross Creek–Homestake Creek drainages and East Lake Creek. High ridges and slopes above roughly 11,000 ft are largely treeless with rock fields and cliffs; the bulk of the unit is steep mid-elevation forested terrain. The southeastern section around Tennessee Pass is somewhat milder than the roadless western wilderness core.

GMU 45 is approximately 90% public land (~195,000 acres), almost entirely White River National Forest; the unit also contains a portion of San Isabel National Forest near its eastern boundary near Tennessee Pass. The Holy Cross Wilderness (122,797 acres, jointly managed by White River NF and Pike-San Isabel NF) covers a significant swath of the western unit. The relevant ranger district for hunting access information is the Holy Cross Ranger District, with an office in Minturn, CO. Primary highway access is US Highway 24, which runs north-south through the unit between Minturn (near Vail) and Tennessee Pass/Leadville. Key forest road access: Forest Road 703 (Homestake Road) departs US-24 south of Red Cliff and follows Homestake Creek southwest to Homestake Reservoir and Gold Park Campground — outfitters operate camps along this corridor. Forest Road 707 (Tigiwon Road) leaves US-24 near Minturn and climbs 8 miles to the Halfmoon Trailhead/campground on the north boundary of the Holy Cross Wilderness; the road is one lane, rough, with steep switchbacks, suitable for high-clearance vehicles. Shrine Pass Road provides access to the unit's northeastern edge from I-70 at Vail Pass (Exit 190). Within the Holy Cross Wilderness, motorized vehicles and bicycles are prohibited; over 25 trailheads provide foot and horse access. Most of the unit south and west of the major forest roads is effectively roadless backcountry requiring multi-mile pack-in. No significant private checkerboard is present given the high public land percentage, though some private land exists in the lower Eagle River corridor near Minturn and Red Cliff.

Vegetation transitions sharply with elevation. Lower drainages (roughly 7,500–9,000 ft) along the Eagle River, Homestake Creek, and their tributaries support sagebrush parks, riparian willow and cottonwood, and some pinyon-juniper. Mid-elevation slopes (9,000–11,500 ft) — which constitute the bulk of the unit — are dominated by dense spruce-fir on north-facing aspects, with aspen stands and mixed aspen-fir in transition zones; south-facing slopes carry oakbrush and patches of Douglas-fir. Above roughly 11,500 ft the unit transitions through sub-alpine meadows and willow carrs to alpine tundra and rocky terrain near the Continental Divide. The Holy Cross Wilderness core in the western portion is characterized by broad creek valleys with beaver ponds and dark timber giving way to wide alpine basins.

Elk and mule deer are the primary game species. Elk occupy the unit throughout the year but concentrate above 11,000 ft in summer and early fall archery season, retreating to dark timber on north-facing slopes mid-day and feeding along timberline at dawn and dusk. As hunting pressure and winter weather intensify, elk move to lower-elevation drainages and adjacent units. Mule deer follow a similar pattern: they summer at high elevations within GMU 45 and migrate to lower-elevation winter range in Unit 44 (to the north and northwest) during late rifle and muzzleloader seasons; the southern high-elevation areas of 45 function as summer range, and the lower northern reaches serve as transitional fall range before the winter migration. Black bear are present throughout the unit and are attracted to the riparian corridors and berry patches in late summer and fall. Mountain lion inhabit the unit year-round, following deer and elk. The Holy Cross Wilderness core supports resident populations of all major mountain species.