Kaiparowits, West, Utah

The unit spans canyon country on and around the Kaiparowits Plateau, with elevation ranging from approximately 3,900 feet along the southern canyon drainages near the Utah-Arizona border and Lake Powell-adjacent washes, to roughly 7,500 feet on the higher plateau benches. Terrain is highly rugged, consisting of deep canyon systems (Paria River corridor, Hackberry Canyon, Cottonwood Canyon, Johnson Canyon drainages), sandstone and shale cliffs, steep-sloped escape terrain favored by bighorn sheep, and broad plateau benches. The unit is remote with limited road access and frequent road washouts after precipitation events.

The unit boundary is defined by US-89 and the Utah-Arizona state line on the south and southeast; the Cockscomb–House Rock Valley Road on the southwest; US-89 again linking to the Johnson Canyon Road on the north-western approach; the Skutumpah Road (dirt/gravel, high-clearance recommended) running northeast to Cottonwood Canyon Road; the Cottonwood Canyon Road (BLM, rough dirt, frequently impassable when wet) running north to SR-12; and the Smoky Mountain Road (BLM Road 300, rough two-track through the center of the plateau) forming the eastern boundary from SR-12 south to US-89. Most interior bighorn habitat is roadless. Primary access corridors include US-89 (paved) running along the southern edge through Kanab and toward Page/Big Water; Cottonwood Canyon Road providing north-south access through the heart of the western unit; and Johnson Canyon Road off US-89 near Kanab offering northern approach. Nearest services are in Kanab (~50 miles west) and Big Water (~30 miles east along US-89). The unit is 94.3% BLM-administered Grand Staircase-Escalante National Monument (489,244 acres of 518,681 total modeled bighorn habitat); Utah State Institutional Trust Lands 1.7% (9,008 acres), Private 1.6% (8,104 acres), NPS 1.2% (6,069 acres), National Forest 0.8%, Utah State Parks 0.3%, and UDWR <0.1%. No CWMUs identified within this unit boundary in UDWR documents reviewed.

The plateau benches are dominated by pinyon-juniper woodland, with open shrub/scrub communities (sagebrush, blackbrush, desert shrub) on lower benches and canyon rims. Riparian vegetation including serviceberry, snowberry, and cottonwood grows in wash bottoms along the Paria River, Hackberry Canyon, Cottonwood Canyon, and associated drainages. Higher elevations support limited ponderosa pine and juniper. Conifer encroachment on open hillsides has been identified as a habitat concern for bighorn sheep.

Desert bighorn sheep (Ovis canadensis nelsoni) are the primary managed game species. The population objective for the West sub-unit is 550 desert bighorn sheep, managed as part of the larger Kaiparowits WMU #26 alongside East and Escalante sub-units. Sheep primarily occupy canyon drainages, cliff faces, and rugged escape terrain throughout the unit; ground monitoring areas noted by UDWR include Coyote Creek, Paria River, Tibbets Canyon, Wiregrass Canyon, and Smoky Mountain. The 2018 aerial survey (most recent in the August 2019 management plan) estimated 437 sheep in the West sub-unit. The population has been augmented by transplants from Arizona, Nevada, and other Utah herds. Mountain lion (cougar) is present and identified as the primary predator of bighorn sheep; predator management is coordinated with USDA Wildlife Services. Mule deer occupy the unit in limited numbers. Disease surveillance (November 2014 live capture) confirmed the West sub-unit population is positive for Mycoplasma ovipneumoniae, an important pathogen in the bighorn sheep respiratory disease complex; no major die-offs have been documented as of the 2019 management plan. Subunit populations have extensive habitat connectivity and radio-collar data confirms sheep movement across all three Kaiparowits sub-units.