APPENDIX A 

 SITE BASIC RECORDS FOR EACH SITE VISITED 



Site Basic Record 



BLOCK MOUNTAIN 



From Glen, proceed south on pavement ca. 0.75 mile to the Burma Road. Take this road 7.5 miles 

 to Sandy Hollow. Block Mountain is 1.5 miles northeast. 



Block Mountain is a flat-topped basalt butte rising ca. 700 feet above the draw to the west. 

 Slopes are very steep and rocky, discouraging access by cattle. Vegetation is primarily 

 Artemisia tridentata shrublands and Agropyron spicatum grasslands. Small amounts of Juniperus 

 scopulorLin woodlands and Cercocarpus ledifolius shrublands occur on the summit and on the 

 rimrocks. 



COUNTY: Madison 



USGS QUADRANGLE: BLOCK MOUNTAIN 



TOUNSHIP-RANGE: 004S008U SECTION: 23 



QUARTER/ADDITIONAL SECTIONS: Portions of 23, 24, 25, and 26 



BOUNDING RECTANGLE: S: 452734N N: 452824N E: 1123228W W: n23332W 



BOUNDARY JUSTIFICATION: The primary boundary contains the least disturbed (by cattle) vegetation 



occurrences on Block Mountain. The boundary encircles the mountain down to the 

 major draws to the west, north, east and southeast. The southwest boundary is 

 defined by the abrupt change in slope gradient along the 5200-feet contour. 



APPROXIMATE ACREAGE: 340.00 



GENERAL RATING: 2 



G2? and G3? community elements are present: Agropyron spicatum/Oryzopsis hymenoides and 

 Juniperus scopulorum/Artemisia tridentata, respectively. 



BIODIVERSITY SIGNIFICANCE: B3 



The site contains occurrences of G2? and G3? community elements and common community types in 

 pristine condition. 



OTHER VALUES: V2 



Block Mountain is a prominent and highly aesthetic feature of the landscape. 



PROTECTION URGENCY: P4 



The upper slope and mesa-top vegetation is relatively pristine due to rocky and steep 

 topography isolated from water. It is unlikely that increased cattle disturbance is a threat. 

 The pristine vegetation occurrences make Block Mountain worthy of consideration for ACEC 

 designation. 



MANAGEMENT URGENCY: M4 



The less steep, less rocky side slopes of the mountain have been heavily grazed by cattle and 

 horses in some places. Careful management of livestock to minimize such disturbances would be 

 desirable. 



CONSERVATION INTENT: Recommend establishment of a BLM ACEC. 



PROTECTION COMMENTS: The summit of Block Mountain is by coincidence protected from most use by 

 domestic stock since it is surrounded by very steep and rocky slopes. 



LAND USE: The primary land use has been for livestock grazing and wildlife production. However, no water 

 developments are present on the steep slopes or summit of Block Mountain, so cattle use has 

 been light to nonexistent on these sites. 



NATURAL HAZARDS: The rimrock cliffs and rattlesnakes may pose hazards. 



