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Conserving globally rare plants on lands administered by the Dillon Office of the Bureau of Land Management (2003) (16638807626)


Conserving globally rare plants on lands administered by the Dillon Office of the Bureau of Land Management (2003) (16638807626)



Johnson Gulch area, Beaverhead County, Montana, USA
Title: Conserving globally rare plants on lands administered by the Dillon Office of the Bureau of Land Management
Identifier: 7A3084E0-64D5-462D-AFB1-40FDC685EE2D (find matches)
Year: 2003 (2000s)
Authors: Lesica, Peter; United States. Bureau of Land Management. Dillon Office
Subjects: Rare plants; Rare plants; Habitat conservation
Publisher: Helena, MT : Natural Heritage Program
Contributing Library: Montana State Library

Text Appearing Before Image:
JOHNSON GULCH Description Johnson Gulch hes on the west side of the Tendoy Range in southern Beaverhead County. This area is bounded on the west by Medicine Lodge Creek and on the east by the crest of the Tendoy Mountains and includes the entire drainages of Deer Creek, Johnson Gulch and Kissick Canyon. Elevations range from 6,150 ft along Medicine Lodge Creek to 8,500 ft on the crest of the Tendoys. Johnson Gulch and Deer Creek have permanent surface water in their upper reaches but are intermittent lower down. Poison Lakes, two small natural water bodies occur just west of the Tendoy crest at 8,100-8,300 ft in elevation. The upper lake has a broad drawdown zone and appears to be fed primarily by snowmelt and other surface runoff. The lower lake has a stable water level and must be fed by underground springs, possibly originating at the upper lake. The lower lake has a broad band of floating peat separating the shore from open water. There has been mining activity in the western portion of the site. The subirrigated area along Medicine Lodge Creek is used for hay production. The area is subject to livestock grazing and Big game hunters use it during hunting season. Geology and soil The Tendoy Range is composed primarily of Paleozoic and Mesozoic sedimentary formations tilted and uplifted along the Red Rock fault on the east side of the range. There are extensive exposures of Madison limestone forming cliffs and talus slopes in the three canyons. Fine-textured sediments, metasediments or possibly volcanics outcrop at lower elevations just east of Medicine lodge Creek. There is an inactive mine at the mouth of Deer Creek Canyon on the north side. Mining claims are common south of Deer Creek Canyon and on the crest of the Tendoys. Soils are variable. They are deep and productive at the head of drainages and in the more gentle topography near the Tendoy crest. Soils associated with limestone outcrops are generally shallow. Soils on steep slopes in the western portion of the area are poorly developed and often nearly barren. Evidence of rill and sheet erosion is commonly observed in this area. Vegetation Johnson Gulch supports a mosaic of steppe, woodland and forest communities (Cooper et al. 1995). Gentle slopes over 7,000 ft on well-developed soils support sagebrush steppe, the Artemisia tridentata vaseyana/ Festuca idahoensis community type. This is the dominant zonal vegetation of the site. Lower slopes near the Medicine Lodge Valley support steppe of the Artemisia tridentata wyomingensis/Agropyron spicatum community type. Douglas-fir (Pseudotsuga menziesii) forest occurs on north-facing canyon walls. Johnson Gulch area, Beaverhead Co. Mountain mahogany (Cercocarpus ledifolius) woodlands are found on steep, warm slopes with poorly developed soil, especially on limestone. Low sagebrush steppe (Artemisia nova and A. arbuscula) is uncommon and found on shallow, limestone- derived soils of exposed upper slopes. Subirrigated terraces along Medicine Lodge Creek (and other drainages to a minor extent) support wet meadows dominated by Deschampsia cespitosa or Juncus balticus/Carex praegracilis community types. Associated toeslopes and upper terraces support greasewood, the Sarcobatus vermiculatus/Distichlis striata community type. Wet peat around lower Poison Lake supports poor fen vegetation dominated by Carex utriculata, Menyanthes trifoliata and Urticularia vulgaris.
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Appendix C - 29





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