scientific Name: ARTEMISIA TRIDENTATA/FESTUCA IDAHOENSIS PA 

 Common Name: BIG SAGEBRUSH/ IDAHO FESCUE ASSOCIATION 



Global rank: G5 Forest Service status: 

 State rank: S4 Federal Status: 



Element occurrence code: C5B2BGABA0 . 013 



Survey site name: JOHNSON CREEK EXCLOSURE 



EO rank: AB 

 EO rank comments: NOT GRAZED BY LARGE HERBIVORES SINCE 



1968. HEAVY CATTLE GRAZING ON ADJACENT 



LANDS MAY CAUSE INCREASED EROSION AND 



WEED INFLUX INTO EXCLOSURE. 



County: SILVER BOW 



USGS quadrangle: DICKIE HILLS 



Township: OOIN Range: OllW Section: IS Precision: S 



Township-range comments: NW4SW4 



Survey date: 1991-06-14 Elevation: 6140 

 First observation: 1991 Slope/aspect: 15% / SOUTH 



Last observation: 1991-06-14 Size (acres) : 40 



Location: 



FROM WISE RIVER (TOWN) , PROCEED WEST ALONG STATE HIGHWAY 4 3 TO THE BIG 

 HOLE RIVER. CA. 0.2 MILE AFTER CROSSING THE RIVER, TURN RIGHT ONTO A 

 GRAVEL ROAD AND CONTINUE 3.5 MILES TO JOHNSON CREEK. TAKE THE FIRST 

 LEFT OFF JOHNSON CREEK ROAD (0.2 MILE FROM RIVER), AND FOLLOW THIS 

 ROAD CA. 1 MILE TO THE EXCLOSURE. 



Element occurrence data: 



WITHIN PLOT, 12 SPECIES OBSERVED. DOMINANTS INCLUDE: ARTEMISIA 

 TRIDENTATA (30% CANOPY COVER) , AGROPYRON SPICATUM (30%) , FESTUCA 

 IDAHOENSIS (50%), POA SANDBERGII (1%), AND ARENARIA CONGESTA (3%). 

 COMPLETE LIST ON FILE AT MONTANA NATURAL HERITAGE PROGRAM. 



General site description: 



RESIDUAL MOUNTAIN RIDGE; PLOT POSITION IS WIDE RIDGE SUMMIT. QUARTZITE 

 PARENT MATERIAL AND TYPIC ARGIBOROLL SOIL SUBGROUP. GROUND COVER: BARE 

 SOIL (30%), TOTAL COARSE FRAGMENTS (10%). 



Land owner/manager: 



BLM: BUTTE DISTRICT, HEADWATERS RESOURCE AREA 



Comments : 



MTNHP PLOT #91RD022. SURVEY CONDUCTED BY R. L. DEVELICE. EXCLOSURE 

 ESTABLISHED IN 1968 (PERS. COMM. , JACK JONES, BLM, BUTTE). APPROXIMATE 

 DIMENSIONS - 45m X 45m X 2.5m. 



Information source: 



DEVELICE, ROBERT L. [COMMUNITY ECOLOGIST] . MONTANA NATURAL HERITAGE 

 PROGRAM, 1515 EAST SIXTH AVE., HELENA, MT 59620. 



129 



