▁vol can ic ▁plug , ▁on ▁the ▁city ' s ▁west ▁per imeter . ▁ ▁The ▁range ▁is ▁attached ▁to ▁the ▁north west ▁of ▁the ▁Brad sh aw ▁Mountains , ▁and ▁Gran ite ▁Mountain , ▁a ▁recre ation ▁site , ▁as ▁well ▁as ▁a ▁rock cl im bing ▁location , ▁is ▁part ▁of ▁the ▁range ' s ▁n ortheast ▁section , ▁over looking ▁William son ▁Valley , ▁further ▁n ortheast . ▁ ▁The ▁Sierra ▁Pri eta ▁range ▁is ▁adjacent ▁the ▁north west ▁per imeter ▁of ▁the ▁Arizona ▁transition ▁zone , ▁mostly ▁known ▁by ▁its ▁per imeter ▁M og oll on ▁R im . ▁ ▁Description ▁Sierra ▁Pri eta ▁is ▁a ▁mostly ▁north west ▁by ▁sout heast ▁section ▁of ▁mountains . ▁The ▁highest ▁peak ▁in ▁the ▁south ▁is ▁Mount ▁Francis , ▁, ▁which ▁borders ▁the ▁Brad sh aw ▁Mountains ; ▁Arizona ▁State ▁Route ▁ 8 9 ▁travers es ▁between ▁the ▁two ▁mountain ▁ranges . ▁ ▁The ▁range ▁high point ▁is ▁Gran ite ▁Mountain , ▁, ▁anch oring ▁the ▁range ' s ▁N ▁& ▁N NE ; ▁it ▁is ▁separated ▁from ▁the ▁central ▁section ▁by ▁Little ▁Gran ite ▁Mountain , ▁ ▁to ▁the ▁south west , ▁and ▁by ▁T onto ▁Mountain , ▁, ▁which ▁is ▁due ▁west . ▁Two ▁other ▁pe aks ▁form ▁the ▁range ' s ▁center , ▁West ▁Spr uce ▁Mountain , ▁, ▁and ▁Williams ▁Pe ak , ▁. ▁ ▁Rout es ▁Besides ▁Arizona ▁ 8 9 ▁going ▁south west ▁from ▁Pres c ott ▁between ▁the ▁Brad sh aw ▁Mountains , ▁County ▁