 North of the South Fork Payette River and east of the North Fork Payette River , the forest is part of the Salmon River Mountains , which extend north and east outside the forest 's boundaries . The South Fork Salmon River Range and the North Fork Range are subranges of the Salmon River Mountains within Boise National Forest . The Boise Mountains cover much of the southern portion of the forest and contain the forest 's highest point , Steel Mountain , but the range 's highest point , Two Point Mountain , lies outside of the forest 's boundary . The Trinity Mountains are a subrange in southeastern part of the Boise Mountains that reach their peak at 9 @,@ 451 feet ( 2 @,@ 881 m ) on Trinity Mountain . The westernmost portion of the forest south and west of Lake Cascade are part of the West Mountains , which reach their highest point at 8 @,@ 320 feet ( 2 @,@ 540 m ) on Snowbank Mountain . The Danskin Mountains are a smaller range on the forest 's southern border that run northwest to southeast . 
 North of the South Fork Payette River and east of the North Fork Payette River , the forest <a href='drop_aux' title='1'><mark>is</mark></a>part of the Salmon River Mountains , which extend north and east outside the forest <a href='null_genetive' title='2'><mark>'s</mark></a>boundaries . The South Fork Salmon River Range and the North Fork Range <a href='drop_aux' title='3'><mark>are</mark></a>subranges of the Salmon River Mountains within Boise National Forest . The Boise Mountains cover much of the southern portion of the forest and contain the forest <a href='null_genetive' title='4'><mark>'s</mark></a>highest point , Steel Mountain , but the range <a href='null_genetive' title='5'><mark>'s</mark></a>highest point , Two Point Mountain , <a href='uninflect' title='6'><mark>lies</mark></a> outside of the forest <a href='null_genetive' title='7'><mark>'s</mark></a>boundary . The Trinity Mountains <a href='drop_aux' title='8'><mark>are</mark></a>a subrange in southeastern part of the Boise Mountains <a href='null_relcl' title='9'><mark>that</mark></a>reach their peak at 9 @,@ 451 feet ( 2 @,@ 881 m ) on Trinity Mountain . The westernmost portion of the forest south and west of Lake Cascade <a href='drop_aux' title='10'><mark>are</mark></a>part of the West Mountains , which reach their highest point at 8 @,@ 320 feet ( 2 @,@ 540 m ) on Snowbank Mountain . The Danskin Mountains <a href='drop_aux' title='11'><mark>are</mark></a>a smaller range on the forest <a href='null_genetive' title='12'><mark>'s</mark></a>southern border <a href='null_relcl' title='13'><mark>that</mark></a>run northwest to southeast . 
North of the South Fork Payette River and east of the North Fork Payette River , da forest part of tdaSalmon River Mountains , which extend north and east outside the forest  boundaries . The South Fork Salmon River Range and thdaorth Fork Range subranges of the Salmon River Mountains within Boise National Forest . The Boise Mountains cover much of thedauthern portion of the forest and contain the daest  highest point , Steel Mountain , but the rdae  highest point , Two Point Mountain , lie outside of the fodat  boundary . The Trinity Mountains a subrange in southeastern part of the BoidaMountains reach their peak at 9 @,@ 451 feet ( 2 @,@ 881 m ) on Trinity Mountain . The westernmost portion of the forest south and west of Lake Cascade part of the West Mountains , which reach their highest point at 8 @,@ 320 feet ( 2 @,@ 540 m ) on Snowbank Mountain . The Danskin Mountains a smaller range on the forest  southern border run northwest to southeast .