 The Idaho Batholith underlays most of Boise National Forest , forming the forest 's Boise , Salmon River , and West mountain ranges ; the forest reaches a maximum elevation of 9 @,@ 730 feet ( 2 @,@ 970 m ) on Steel Mountain . Common land cover includes sagebrush steppe and spruce @-@ fir forests ; there are 9 @,@ 600 miles ( 15 @,@ 400 km ) of streams and rivers and 15 @,@ 400 acres ( 62 km2 ) of lakes and reservoirs . Boise National Forest contains 75 percent of the known populations of Sacajawea 's bitterroot , a flowering plant endemic to Idaho . 
 The Idaho Batholith <a href='uninflect' title='1'><mark>underlays</mark></a> most of Boise National Forest , forming the forest <a href='null_genetive' title='2'><mark>'s</mark></a>Boise , Salmon River , and West mountain <a href='uninflect' title='3'><mark>ranges</mark></a> ; the forest <a href='uninflect' title='4'><mark>reaches</mark></a> a maximum elevation of 9 @,@ 730 feet ( 2 @,@ 970 m ) on Steel Mountain . Common land cover <a href='uninflect' title='5'><mark>includes</mark></a> sagebrush steppe and spruce @-@ fir forests ; <a href='dey_it' title='6'><mark>there</mark></a> are 9 @,@ 600 miles ( 15 @,@ 400 km ) of streams and rivers and 15 @,@ 400 acres ( 62 km2 ) of lakes and reservoirs . Boise National Forest <a href='uninflect' title='7'><mark>contains</mark></a> 75 percent of the known populations of Sacajawea <a href='null_genetive' title='8'><mark>'s</mark></a>bitterroot , a flowering plant endemic to Idaho . 
The Idaho Batholith underlay most of Boise National Forest , forming da forest  Boise , Salmon River , and West mountain range ; the forest reach a maximum elevation of 9 @,@ 730 feet ( 2 @,@ 970 m ) on Steel Mountain . Common land cover include sagebrush steppe and spruce @-@ fir forests ; it is 9 @,@ 600 miles ( 15 @,@ 400 km ) of streams and rivers and 15 @,@ 400 acres ( 62 km2 ) of lakes and reservoirs . Boise National Forest contain 75 percent of the known populations of Sacajawea  bitterroot , a flowering plant endemic to Idaho .