Upper Rincon Roadless

Upper Rincon Roadless covers 2,991 acres on the northwest flank of the Rincon Mountains in the Coronado National Forest's Santa Catalina Ranger District, Pima County, Arizona. The terrain is arid basin country anchored by Italian Trap, Tanque Verde Canyon, and Bolt Canyon as they fall toward Tucson and the eastern edge of Saguaro National Park. The Upper Tanque Verde Wash headwaters drain west through the area, with Park Tank and Buckhorn Tank holding stock water on the upland benches.

Vegetation reflects a Sky Island-edge desert mosaic. On the lower exposures, Saguaro Cactus and Palo Verde Desert holds saguaro (Carnegiea gigantea), southwestern barrel cactus (Ferocactus wislizeni)—vulnerable on the IUCN Red List—ocotillo (Fouquieria splendens), and spoonflower (Dasylirion wheeleri). Mojave Creosote Desert, Upper Sonoran Desert Scrub, Chihuahuan Desert Mixed Scrub, and Chihuahuan Desert Cactus Scrub occupy the basin and lower bajada. Apache-Chihuahuan Desert Grassland and Chihuahuan-Sonoran Desert Swale Grassland open in swales. The mid-slopes carry Arizona Plateau Chaparral with Mexican manzanita (Arctostaphylos pungens), Sky Island Pinyon-Juniper Woodland, Sky Island Juniper Savanna, and Sky Island Oak Woodland with Emory's oak (Quercus emoryi), shrub live oak (Quercus turbinella), silver-leaf oak (Quercus hypoleucoides), and Arizona madrone (Arbutus arizonica). Along the perennial reaches of Tanque Verde Canyon and Bolt Canyon, Warm Desert Mountain Streamside Woodland holds Wright's sycamore (Platanus wrightii), Fremont cottonwood (Populus fremontii), narrowleaf willow (Salix exigua), netleaf hackberry (Celtis reticulata), and New Mexico locust (Robinia neomexicana).

Wildlife stacks across the elevation transition. In the upper oak woodland and canyon corridors, elegant trogon (Trogon elegans) and Mexican whip-poor-will (Antrostomus arizonae) hold during the breeding season; Arizona woodpecker (Dryobates arizonae), whiskered screech-owl (Megascops trichopsis), and red-faced warbler (Cardellina rubrifrons) work the oak-juniper canopy. Flammulated owl (Psiloscops flammeolus) calls from pine-oak edges. On the desert and chaparral slopes, varied bunting (Passerina versicolor), Scott's oriole (Icterus parisorum), and gray vireo (Vireo vicinior) nest in the saguaro and yucca; rufous-crowned sparrow (Aimophila ruficeps) and Woodhouse's scrub jay (Aphelocoma woodhouseii) hold on the chaparral edges. Sonora mud turtle (Kinosternon sonoriense), vulnerable on the IUCN Red List, uses the pools in Tanque Verde Canyon; ornate box turtle (Terrapene ornata), near threatened on the IUCN Red List, occurs in the grassland. Sonoran whipsnake (Masticophis bilineatus) and Arizona black rattlesnake (Crotalus cerberus) hunt the canyon walls; pronghorn (Antilocapra americana) ranges the open swales. Portions of this area fall within the potential range of several federally listed species; see the Conservation section for details.

Crossing the Italian Trap saddle toward Tanque Verde Canyon, a visitor moves through saguaro-palo verde slopes into chaparral and oak woodland, then drops into the canyon shade where Fremont cottonwood and sycamore close overhead. Elegant trogons call from the canyon walls in spring; pools form between volcanic boulders. Climbing toward the Bolt Canyon rim, the view opens across the basin toward Saguaro National Park's Rincon Mountain District to the west and the Santa Catalina Mountains to the north.

Upper Rincon Roadless is a 2,991-acre Inventoried Roadless Area within the Coronado National Forest in Pima County, Arizona. The area is managed within the Santa Catalina Ranger District and lies in the U.S. Forest Service's Southwestern Region, draining the Upper Tanque Verde Wash headwaters on the north and west flank of the Rincon Mountains. The area is protected under the 2001 Roadless Area Conservation Rule.

From 200 to 1450 A.D. people archaeologists call the Hohokam lived in villages near present-day Saguaro National Park, venturing into both the Rincon and Tucson Mountains to hunt and gather native foods to supplement their dry-farming crops of corn, beans, and squash [1]. The Sobaipuri people of the Tucson Basin and their Tohono O'odham neighbors to the west subsequently adopted a desert-adapted lifestyle, hunting deer and rabbits and harvesting cholla buds, prickly pears, and palo verde pods [1]. The Tohono O'odham trace their origins to the Hohokam, who settled along the Salt, Gila, and Santa Cruz rivers thousands of years ago [4]. Even after Arizona became a U.S. territory, Apaches often returned home over and around the high Rincon Mountains [1]. The Gadsden Purchase of 1853 divided O'odham land between the United States and Mexico [4].

The surrender of Apache leader Geronimo in 1886 marked the end of a troubled era in the Tucson Basin [3]. The residents of the former Mexican village, protected by the U.S. Army's Fort Lowell, began to move out to the valleys of Rincon and Tanque Verde Creeks—well-watered bookends to today's Saguaro National Park [3]. Sprawling ranches then began to form in the area, most famously La Cebedilla, the home of Emilio Carrillo, which was later owned by his son Rafael and still operates as the Tanque Verde Guest Ranch [3]. By 1880, the Campos, Van Alstine, Oury, and Carrillo families ran over 1,200 head of cattle on public rangelands that would become Saguaro National Park [1]. The railroad reached Tucson in 1880 [1].

Federal protection of the lands surrounding Upper Rincon Roadless began with the creation of the Santa Catalina Forest Reserve on July 2, 1902 [5]. On July 2, 1908, Executive Order 908 consolidated the Dragoon, Santa Catalina, and Santa Rita National Forests to establish the Coronado National Forest [2]. On October 23, 1953, 425,674 acres of the Crook National Forest were transferred to the Coronado [5]. In 1933, University of Arizona president Homer Shantz convinced President Hoover to set aside Saguaro National Monument in the Rincon Mountains [1]; the protected national-park lands now adjoin Upper Rincon Roadless along the western side of the range. Civilian Conservation Corps workers built recreation areas in and around the growing city of Tucson during the 1930s and 1940s [1]. The roadless designation under the 2001 Roadless Area Conservation Rule preserves the lower-elevation desert and chaparral approach to the upper Tanque Verde Wash drainage on Coronado National Forest lands.

Vital Resources Protected

• Tanque Verde Wash Headwater Protection: Upper Rincon Roadless' 2,991 acres include the Upper Tanque Verde Wash headwaters as they fall through Tanque Verde Canyon and Bolt Canyon toward Tucson and the Rincon Mountain District of Saguaro National Park. Keeping the canyon walls and Italian Trap saddle uncut allows precipitation to infiltrate the soil rather than running directly off bare surfaces, sustaining the pool habitat that Sonora mud turtle (Kinosternon sonoriense), vulnerable on the IUCN Red List, depends on in the perennial reaches.

• Sky Island Canyon Woodland and Elegant Trogon Habitat: Sky Island Oak Woodland, Arizona Plateau Chaparral, and Warm Desert Mountain Streamside Woodland line Tanque Verde Canyon and Bolt Canyon, with Arizona madrone (Arbutus arizonica), silver-leaf oak (Quercus hypoleucoides), Emory's oak (Quercus emoryi), and Wright's sycamore (Platanus wrightii) forming a Madrean canopy. The roadless condition preserves the closed-canopy nesting habitat that elegant trogon (Trogon elegans), Mexican whip-poor-will (Antrostomus arizonae), whiskered screech-owl (Megascops trichopsis), and Arizona woodpecker (Dryobates arizonae) require—a Sky Island bird assemblage that depends on intact canyon woodlands.

• Saguaro National Park Connectivity at the Urban Interface: Upper Rincon Roadless lies between Saguaro National Park's Rincon Mountain District and the eastern edge of Tucson's developing foothill front. The roadless condition extends the unbroken Saguaro Cactus and Palo Verde Desert, Sky Island Pinyon-Juniper Woodland, and Sky Island Oak Woodland canopy of the national park across the Coronado National Forest, allowing pronghorn (Antilocapra americana), Sonoran whipsnake (Masticophis bilineatus), and other species to move between the park interior and the broader Coronado landscape without crossing a hard urban-edge road.

Potential Effects of Road Construction

• Sedimentation into Tanque Verde Canyon Pools: Road construction across the steep slopes that drop into Tanque Verde and Bolt canyons would expose mineral soil on cut and fill faces. Surface runoff would deliver fine sediment directly into the perennial pools that Sonora mud turtle and the Sky Island bird community depend on, smothering pool substrates and degrading water quality. Cut slopes continue to shed material for years after construction, producing chronic rather than one-time sediment loading.

• Urban-Edge Fragmentation and Loss of Saguaro NP Connectivity: A road corridor cut across Upper Rincon Roadless would slice through habitat that currently extends continuous from Saguaro National Park into the Coronado National Forest. NatureServe assessments identify roads, housing, and commercial development as a pervasive, extreme-severity threat to saguaro and cactus ferruginous pygmy-owl (Glaucidium brasilianum cactorum) at this Tucson-edge location specifically. Re-establishing connectivity across an urban-side road is much harder than restoring backcountry crossings because adjacent development locks in the new edge.

• Buffelgrass Invasion in Saguaro–Palo Verde Desert: Construction equipment and the bare, regularly disturbed surface of a new road act as a vector and seedbed for buffelgrass (Pennisetum ciliare), already documented as a pervasive threat to Saguaro Cactus and Palo Verde Desert in this region. Once established, buffelgrass and similar annuals carry fast-moving fires through saguaro stands that are not adapted to repeated burning. Each subsequent fire favors more grass over native saguaro and palo verde, making the change effectively permanent.

Upper Rincon Roadless covers 2,991 acres on the northwest flank of the Rincon Mountains in the Coronado National Forest's Santa Catalina Ranger District, Pima County. The Italian Spring Trail (No. 95) runs 7.1 miles of native-surface tread through and adjacent to the area, open to hikers and horse riders, with access from the Alambre OHV Staging Area and Italian Springs Access. Douglas Spring Campground sits within nearby Saguaro National Park East, providing a developed overnight option. Backcountry camping in the roadless area itself is dispersed.

The Italian Spring Trail follows the rim and saddles between Italian Trap, Tanque Verde Canyon, and Bolt Canyon, dropping through chaparral, oak woodland, and pinyon-juniper toward the lower bajada. Visitors should expect rugged ground, loose rock, and intense summer heat. The trail connects to the larger Rincon Mountain trail system, and through Douglas Spring Trail to Saguaro National Park East.

Hunting in and around the area follows Arizona Game and Fish Department regulations for the units that include the Rincon Mountains. The mosaic of saguaro-palo verde desert, desert grassland, chaparral, and oak-juniper woodland supports general hunts; pronghorn (Antilocapra americana) ranges the open swales; collared peccary (Pecari tajacu) and gambel's quail use the chaparral; black-tailed jackrabbit and desert cottontail occur across the basin. Hunters should verify current AZGFD seasons and unit boundaries before entering.

Birding around Upper Rincon Roadless is exceptionally well-documented. Thirty-six eBird hotspots fall within 18 km of the area, anchored by Agua Caliente Park (257 species, 10,496 checklists), Tanque Verde Wash–Wentworth Road (236 species, 3,314 checklists), and Mt. Lemmon–Molino Basin (184 species, 4,649 checklists). Saguaro National Park East locations—Cactus Forest Drive Loop (146 species), Douglas Spring Trail (143 species), Lower Chiminea Canyon (139 species)—and Mt. Lemmon Bear Canyon (138 species) extend the regional checklist into adjacent ecosystems. Within Upper Rincon Roadless itself, elegant trogon (Trogon elegans), Mexican whip-poor-will (Antrostomus arizonae), whiskered screech-owl (Megascops trichopsis), and Arizona woodpecker (Dryobates arizonae) work the canyon oak-madrone canopy; flammulated owl (Psiloscops flammeolus) calls from pine-oak edges at night; rufous-crowned sparrow (Aimophila ruficeps), Woodhouse's scrub-jay (Aphelocoma woodhouseii), and gray vireo (Vireo vicinior) hold on the chaparral slopes.

Tanque Verde Canyon and Bolt Canyon hold spring-fed pools where Sonora mud turtle (Kinosternon sonoriense) and canyon treefrog occur; angling here is not a primary activity given the small, ephemeral nature of most flows. Photographers find long views from Italian Trap saddle across the Tanque Verde Valley toward the Catalina Mountains and Tucson, with strong light through Madrean oak-madrone canopy in the canyons.

Because there are no Forest roads inside Upper Rincon Roadless, every activity—the Italian Spring Trail hike, the climb across Italian Trap, birding the elegant trogon territory in Tanque Verde Canyon, the connection across to Saguaro National Park—depends on the foot or stock approach from the Alambre OHV Staging Area and Italian Springs Access. A road corridor would shorten walk-in distance but would fragment the unbroken canopy that elegant trogon and the Sky Island bird community require, deliver sediment and noise to the spring-fed canyon pools, and erode the buffer between the Tucson foothill front and Saguaro National Park.