Solomon Basin

The 19,963-acre Solomon Basin Inventoried Roadless Area occupies a high-elevation block on the Fremont River Ranger District of the Fishlake National Forest in central Utah, on the eastern edge of the Wasatch and Fish Lake plateaus where they break toward the canyons of Emery and Wayne counties. The unit's named landforms outline its character: the Limestone Cliffs on the northern rim, Geyser Peak rising above Foy Bench, the open ground of Solomon Basin itself, the cut of Deer Spring Draw, the high Windy Ridge, and the gentler Forsyth Valley. Water collects from the upper Solomon Creek headwaters (HUC12 140700020502) and from Temple Wash, gathering into Solomon Reservoir, Rock Lake, Deer Spring, Farrell Pond, and Floating Island Lake — a montane wetland complex unusual for this part of central Utah.

Forest communities track elevation and aspect from the canyon rim upward. On the lower fringes Colorado Plateau Pinyon-Juniper Woodland and Pinyon-Juniper Shrubland dominate, interfingered with Intermountain Mountain Sagebrush Steppe across drier benches. Antelope bitterbrush (Purshia tridentata) and Utah serviceberry (Amelanchier utahensis) fill the shrub layer with big sagebrush (Artemisia tridentata). Above the pinyon belt, Rocky Mountain Gambel Oak Shrubland and Intermountain Mountain Mahogany Woodland with curl-leaf mountain mahogany (Cercocarpus ledifolius) transition into Southern Rockies Ponderosa Pine Woodland on warm benches and Southern Rockies Mixed Conifer Forest on shaded slopes. Stands of Rocky Mountain Aspen Forest with quaking aspen (Populus tremuloides) and Douglas-fir (Pseudotsuga menziesii) cover the upper slopes, giving way to Rocky Mountain Dry Subalpine Spruce-Fir Forest and isolated stands of Great Basin Subalpine Bristlecone Pine Woodland on the exposed limestone ridges. Wyoming Indian-paintbrush (Castilleja linariifolia), scarlet skyrocket (Ipomopsis aggregata), and silvery lupine (Lupinus argenteus) flower in the openings.

Wildlife use cuts across these strata. Bighorn sheep (Ovis canadensis) work the Limestone Cliffs and the ridgelines above Solomon Basin. Mule deer (Odocoileus hemionus) move seasonally between the aspen-mixed conifer middle slopes and the lower pinyon-juniper winter range. Rocky Mountain cutthroat trout (Oncorhynchus virginalis) holds in the cooler reaches of Solomon Creek. Golden eagle (Aquila chrysaetos) and osprey (Pandion haliaetus) hunt the cliffs and lake margins. Lewis's woodpecker (Melanerpes lewis) and Grace's warbler (Setophaga graciae) breed in the ponderosa, while Clark's nutcracker (Nucifraga columbiana) caches bristlecone and limber pine seeds along the high rim — a relationship on which both bird and tree depend. Wright's fishhook cactus (Sclerocactus wrightiae), an IUCN Near Threatened species, occurs on the area's shale-derived soils. Portions of this area fall within the potential range of several federally listed species; see the Conservation section for details.

A traveler crossing the unit from Forsyth Valley climbs through sage and pinyon into aspen openings on Foy Bench. The air cools at the lake basins, where mink slips along the willow margins. Above, the spruce-fir closes in on the way to Windy Ridge, and the limestone cliffs of Geyser Peak open to long views east toward the San Rafael Swell.

The 19,963-acre Solomon Basin Inventoried Roadless Area sits on the Fremont River Ranger District of the Fishlake National Forest in central Utah, straddling parts of Emery, Sevier, and Wayne counties. Human use of this high plateau country runs back two thousand years.

The earliest traces of maize known in Utah date to about 100 B.C. in the Sevier Valley [2], the lowland directly below the area's western flank. Over the following millennium the Fremont culture took hold across central Utah: they built villages of pit houses with adobe structures to store food and cultivated corn, beans, and squash using irrigation techniques [3]. Archaeologists first identified the Fremont culture in 1928 near Torrey, Utah and named it after the Fremont River [2], the drainage that defines the southern edge of this ranger district. The villages, agricultural strategy, and unique artistic elements of the Fremont Culture fade from the archeological record between 1300 and 1500 C.E. [3]. The Pahvant Utes and Southern Paiute occupied the area when the first Euro-Americans arrived; travelers on the Old Spanish Trail and mountain man Jedediah S. Smith were among those who crossed the county before white settlement [4].

Mormon settlement of the Sevier Valley began in early 1864 when ten men settled in the Richfield area and several other towns were founded in the next few years [4]. Violent confrontations with the Ute Indians during the Black Hawk War (1865–68) forced the abandonment of all the Sevier settlements in April 1867, and attempts to resettle did not succeed until 1870 [4]. The Denver and Rio Grande Railroad reached Salina in 1891 and Richfield in 1896, improving the marketing of Sevier County agricultural products [4]. On March 11, 1889, the Fish Lake Water Agreement transferred Paiute rights to the Fremont Irrigation Company in exchange for 9 horses, 500 pounds of flour, 1 good beef steer, and 1 suit of clothes, along with reserved fishing rights at the outlet forever [1].

Federal forest protection followed soon after. The Fish Lake Forest Reserve of 67,840 acres was established on February 10, 1899, by President William McKinley to protect the Fish Lake and Fremont River watersheds — the first unit of what would eventually become the Fishlake National Forest [1]. President Theodore Roosevelt added the Fillmore Forest Reserve of 399,600 acres on May 2, 1906, and the Glenwood Forest Reserve of 173,896 acres on February 6, 1907 [1]. On March 4, 1907, an act of Congress changed the name of National Reserves to National Forests, and on July 1, 1908, the Glenwood and Fishlake forests were combined to form the Fishlake National Forest [1]. Solomon Basin's 19,963 acres are today protected under the 2001 Roadless Area Conservation Rule.

Vital Resources Protected

• Headwater and Wetland Integrity — The roadless condition preserves the Solomon Creek headwaters (HUC12 140700020502) and Temple Wash, along with an unusual montane lake complex — Solomon Reservoir, Rock Lake, Deer Spring, Farrell Pond, and Floating Island Lake — clustered within a single 19,963-acre block. This mosaic of small lentic and lotic habitats is rare on the Wasatch and Fish Lake plateaus, where most water bodies have been modified for irrigation or reservoir storage. Unbroken cover protects the cold-water inflows and the riparian Streamside Woodlands that buffer them.

• Pinyon-Juniper and Sagebrush Mosaic — Colorado Plateau Pinyon-Juniper Woodland covers 41% of the unit and Intermountain Mountain Sagebrush Steppe an additional 14%. Both systems have lost extensive area across the Intermountain West to cheatgrass (Bromus tectorum) conversion and altered fire frequency. The roadless condition keeps the Solomon Basin mosaic intact at landscape scale, preserving habitat for pinyon jay (Gymnorhinus cyanocephalus, under federal review), declining sagebrush birds, and the Last Chance townsendia (Townsendia aprica) and Wright's fishhook cactus (Sclerocactus wrightiae) that occupy shale-derived soils within the larger system.

• Cliff and Subalpine Habitat for Specialist Species — The Limestone Cliffs and the bristlecone-pine ridges above Solomon Basin provide habitat for bighorn sheep (Ovis canadensis) lambing and escape terrain, for Mexican spotted owl roost canyons, and for Clark's nutcracker cache sites in the Great Basin Subalpine Bristlecone Pine Woodland that anchors the highest ground. The roadless condition keeps these narrow-band habitats free of road-edge disturbance, recreational pressure on cliff approaches, and white-pine blister rust spore introduction along disturbed corridors.

Potential Effects of Road Construction

• Direct Damage to Endemic Cactus Sites — Cut and fill construction in the Solomon Basin area would directly destroy individual plants of Wright's fishhook cactus, San Rafael cactus (Pediocactus despainii), Winkler's pincushion cactus (Pediocactus winkleri), and Last Chance townsendia, all federally listed and concentrated on the shale soils that the road prism would cut into. Once removed, these populations recover only over decades of in-situ recruitment from neighboring plants — the road becomes a permanent population gap.

• Pinyon-Juniper Fragmentation and Pinyon Jay Decline — A road network through the area would fragment the contiguous pinyon-juniper canopy that the pinyon jay depends on for caching pinyon seeds. Pinyon jays have declined across the West where this habitat has been fractured or converted, and edge effects from roads also accelerate the encroachment of cheatgrass into the sagebrush understory. The result is a feedback in which roads carry the invasive grass deeper into the system, while pinyon jay flocks lose the connected canopy patches they need.

• Disturbance to Cliff and Wetland Species — Roads built to access the basin's interior would carry vehicle noise and motorized recreation pressure to the Limestone Cliffs that bighorn sheep use for lambing and escape, and to the lake margins where Clark's grebe (Aechmophorus clarkii) and other waterbirds nest. Bighorn responses to roads include reduced lamb survival and altered escape-terrain use; lake-margin disturbance reduces nesting success directly. Both effects compound the existing climate and grazing stressors documented for the species in NatureServe assessments.

The Solomon Basin Inventoried Roadless Area covers 19,963 acres of high plateau country on the Fremont River Ranger District of the Fishlake National Forest in central Utah. Recreation here is dispersed and trail-based. There are no developed campgrounds inside the unit; access runs from the Riley Springs and Hogan Pass trailheads on the perimeter, and the Great Western Trail crosses the area on two long segments.

Trails and Trailheads The Solomon Basin segment of the Great Western Trail (GWT-M1, "Loa") runs 6.9 miles of native-surface tread across the upper basin, with the parallel GWT Alternate (GWT-C, "Tidwell Slopes") adding 5.6 miles through Forsyth Valley. Around these spine routes, a network of short connector trails — TR 2190 through TR 2197, the TR 2933 through TR 2939 series, and the Forsyth Driveway (#4144) — links specific drainages and water sources. Most connectors are under a mile; some are short enough to be functional pack-stock access spurs rather than destination routes. The Riley Springs Trailhead anchors the northern side of the area, with the Hogan Pass Trailhead providing access from the south.

Backcountry Camping No developed campgrounds exist inside the unit. Dispersed camping is permitted under Fishlake National Forest rules, with the standard setbacks from water sources and trails. Suitable camp benches sit on Foy Bench, in the open ground of Forsyth Valley, and on the high terraces above the basin lake complex. The Great Western Trail's long, gentle grades make multi-day backpack and pack-stock trips practical, and Solomon Reservoir, Rock Lake, Deer Spring, Farrell Pond, and Floating Island Lake provide reliable late-season water.

Fishing Rocky Mountain cutthroat trout (Oncorhynchus virginalis) hold in the cooler reaches of Solomon Creek. The lake complex inside the unit — Solomon Reservoir, Rock Lake, and Floating Island Lake — and nearby Mill Meadow Reservoir provide stillwater fishing under Utah Division of Wildlife Resources general statewide regulations. Fish Lake itself, immediately east of the unit, is one of central Utah's premier fisheries and the most active eBird hotspot in the vicinity. Anglers should expect walk-in or stock-in access to the inner lakes; check current Utah DWR rules before fishing.

Hunting Solomon Basin lies within Utah Division of Wildlife Resources hunt-unit boundaries that cover the Fish Lake plateau. The mosaic of pinyon-juniper, sagebrush, gambel oak, ponderosa pine, aspen, and mixed conifer supports the standard Fishlake big-game guild. Mule deer (Odocoileus hemionus) are the primary draw, with archery, muzzleloader, and rifle seasons set by Utah DWR. Bighorn sheep (Ovis canadensis) occupy the Limestone Cliffs and Geyser Peak escape terrain but are managed under tightly controlled permit hunts. Hunting access here is foot and horse only inside the unit — there are no motorized routes — so most success depends on packing in from Riley Springs or Hogan Pass.

Wildlife Watching and Birding The high mosaic of pinyon-juniper, sagebrush, aspen, and lake margins concentrates bird life through the summer breeding season. Four eBird hotspots cluster around the unit, with Fish Lake (153 species) and Mill Meadow Reservoir (112) the most productive. Inside the unit, the Solomon Reservoir and Floating Island Lake margins are productive for osprey (Pandion haliaetus), ring-necked duck (Aythya collaris), and northern yellow warbler (Setophaga aestiva). Aspen and ponderosa stands above the basin produce western tanager (Piranga ludoviciana), lazuli bunting (Passerina amoena), and black-headed grosbeak (Pheucticus melanocephalus). Bighorn sheep can be glassed along the Limestone Cliffs in summer.

Why Roadless Matters Here Every recreation use described above depends on the absence of internal roads. The Great Western Trail's value as a foot, stock, and bike route comes from its uninterrupted backcountry character; parallel roads would erase that. Cutthroat trout in Solomon Creek depend on the cold, sediment-free flow that an unroaded watershed delivers. Bighorn sheep on the Limestone Cliffs avoid road-adjacent terrain. The lake-margin birding at Solomon Reservoir and Floating Island Lake depends on the undisturbed shorelines that a roadless basin preserves. Construction of a single system road through Solomon Basin would shorten approaches, raise visitor numbers, and convert this 19,963-acre block from a foot-and-stock backcountry unit to one indistinguishable from the rest of the developed Fishlake.