▁data ▁exists ▁for ▁the ▁Al amed a ▁wh ips nake . ▁Al most ▁all ▁tra pping ▁studies ▁target ing ▁this ▁species ▁have ▁been ▁designed ▁to ▁determine ▁presence ▁or ▁absence ▁for ▁regul atory ▁purposes ▁and ▁assess ing ▁impact s ▁to ▁potential ▁habitat . ▁As ▁such , ▁monitoring ▁is ▁most ▁often ▁habitat ▁based ; ▁assuming ▁s nake ▁abund ance ▁is ▁posit ively ▁correl ated ▁with ▁the ▁amount ▁of ▁coast al ▁scr ub ▁or ▁chap ar ral ▁veget ation ▁and ▁rock ▁lands ▁present . ▁  ▁ ▁The ▁Al amed a ▁wh ips nake ▁is ▁non - m ig rat ory , ▁so ▁distribution ▁is ▁not ▁large . ▁The ▁current ▁distribution ▁has ▁been ▁fragment ed ▁into ▁five ▁populations ; ▁the ▁T ild en - Br iones , ▁Oak land - L as ▁Tr amp as , ▁and ▁Mount ▁Di ablo - Black ▁Hills ▁populations ▁in ▁Cont ra ▁Costa ▁County , ▁the ▁Hay ward - P le as anton ▁R idge ▁population ▁in ▁Al amed a ▁County , ▁and ▁the ▁Sun ol - C ed ar ▁Mountain ▁population ▁largely ▁in ▁Al amed a ▁County ▁with ▁extensions ▁into ▁San ▁Jo aqu in ▁and ▁Santa ▁Clara ▁Count ies , ▁with ▁little ▁to ▁no ▁interaction ▁between ▁the ▁populations . ▁It ▁is ▁estimated ▁that ▁the ▁sn akes ▁go ▁no ▁more ▁than ▁ 1 ▁mile ▁away ▁from ▁core ▁coast al ▁shr ub ▁habitat . ▁ ▁This ▁species ▁inhab its ▁a ▁variety ▁of ▁different ▁chap ar ral , ▁which ▁includes ▁veget ation ▁composed ▁of ▁broad - le aved ▁ever green ▁shr ubs , ▁bush