ELT 154a

Elevation Range
Minimum: 
1899 m
Minimum in ft: 
6230 ft
Maximum: 
2472 m
Maximum in ft: 
8109 ft
Median: 
2218 m
Median in ft: 
7277 ft
Soil Summary: 
detailed soil survey information is not available for this unit; correlates with GES unit 476 characterized by extremely cobbly sandy loams shallow to deep to granite or granite-like bedrock, acid soils lacking lime throughout, minimal soil development, and associated extensive rock outcroppings
Geologic Materials: 
slope alluvium, colluvium and residuum associated mostly with Catalina-Rincon igneous metamorphic complex (TXm). It comprises 95% of the unit
Landforms: 
coarsely dissected mountain slopes with shallow to moderate drainage incision
LTA 154
Madrean oak/conifer/manzanita on hills and mountains with extensive rock outcrops

Map with the ELT 154a polygon highlighted.Photo Point 273, Photo Point 274Photo Point 275Photo Point 271, Photo Point 272Photo Point 276, Photo Point 277Photo Point 106, Photo Point 292, Photo Point 297Photo Point 105Photo Point 107, Photo Point 287, Photo Point 288, Photo Point 289, Photo Point 290, Photo Point 291Photo Point 100, Photo Point 101Photo Point 111, Photo Point 112Photo Point 109, Photo Point 110Photo Point 283Photo Point 281, Photo Point 282Photo Point 159Photo Point 096, Photo Point 098, Photo Point 099Photo Point 293, Photo Point 294, Photo Point 295, Photo Point 296Photo Point 284, Photo Point 285, Photo Point 286Photo Point 299, Photo Point 300Photo Point 298Photo Point 086, Photo Point 088Photo Point 091, Photo Point 093

Landform position classes and corresponding vegetation*

Landform Class Area Percentage of ELTsort icon Vegetation and notes
very dry steep slopes 140 ha 7

Silverleaf oak and netleaf oak, typically with 10-14% combined cover, 2-3 m tall. Much exposed rock, and an occasional ponderosa. Gullies can, however, be dense with these oaks, with 60-79% cover.
moderately dry steep slopes 1107 ha 59

Similar to gently sloping terrain: Quercus hypoleucoides, 2 m tall, with a cover of 10-14%, and ponderosa pine with 5-9% cover, 7 m tall, and a typical dbh of 20 cm.  Madrone is locally common with 1-4% cover.
very moist steep slopes 39 ha 2

Similar to moist steep slopes: Doug fir, SW white pine, ponderosa - each species typically 13-17 m, with a dbh of 25cm, and cover of 15-24%.  Aspen and NM locust each with 1-4% cover, typically 1.3-1.5 m tall - post fire recuits. See Photo Point 291.
moderately moist steep slopes 265 ha 14

Ponderosa pine, SW white pine, and doug fir. Similar to very moist steep slopes. See Photo Point 291.
gently sloping ridges and hills 260 ha 14

Quercus hypoleucoides, 2 m tall, with a cover of 10-14%, and ponderosa pine with 5-9% cover, 7 m tall, and a typical dbh of 20 cm.  Madrone is locally common with 1-4% cover.
toe slopes, bottoms, and swales 6 ha 1

Along Lemmon Creek (see PhotoPoint 283), Salix sp. and Alnus oblongifoloia are at 15-24% cover, combined. Doug fir, ponderosa, and SW white pine give another 40%, combined. This landform is more common than indicated by the '15 acres' recognized by the landform model - more like 150 acres, along the perennial run of Lemmon Creek.  In upper reaches of Lemmon Creek, there is extensive regeneration of NM locust - see photo point 298 - with 40-59% cover, and 4.5 m tall.

*Vegetation estimates are based on field observations, data from photo points, and the ReGAP map (http://earth.gis.usu.edu/swgap/).

Region 3 Mid-Scale Vegetation Cover Classes

Cover Class Area Percentage of ELTsort icon
Tree cc 30+% 1011 ha 54
Tree cc 10 - 29.9% 595 ha 31
Sparsely vegetated, <10% vegetative cover (includes areas of high severity burns, 2002-03) 284 ha 15

Catalina