▁public ▁bath h ouses , ▁sh ade ▁pav il ions , ▁and ▁l ined ▁by ▁a ▁broad ▁bou lev ard ▁that ▁ran ▁along ▁the ▁beach . ▁ ▁Public ▁access ▁to ▁be aches ▁is ▁protected ▁by ▁law ▁in ▁the ▁U . S . ▁State ▁of ▁Oregon , ▁thanks ▁to ▁a ▁ 1 9 6 7 ▁state ▁law , ▁the ▁Oregon ▁Beach ▁Bill , ▁which ▁guaranteed ▁public ▁access ▁from ▁the ▁Columbia ▁River ▁to ▁the ▁California ▁state ▁line , ▁" so ▁that ▁the ▁public ▁may ▁have ▁the ▁free ▁and ▁un inter rupted ▁use ". ▁ ▁Form ation ▁ ▁Be aches ▁are ▁the ▁result ▁of ▁wave ▁action ▁by ▁which ▁waves ▁or ▁curr ents ▁move ▁sand ▁or ▁other ▁loose ▁sed iments ▁of ▁which ▁the ▁beach ▁is ▁made ▁as ▁these ▁particles ▁are ▁held ▁in ▁susp ension . ▁Alternatively , ▁sand ▁may ▁be ▁moved ▁by ▁salt ation ▁( a ▁b oun cing ▁movement ▁of ▁large ▁particles ). ▁Beach ▁materials ▁come ▁from ▁er os ion ▁of ▁rocks ▁off sh ore , ▁as ▁well ▁as ▁from ▁head land ▁er os ion ▁and ▁sl ump ing ▁producing ▁depos its ▁of ▁sc ree . ▁A ▁cor al ▁re ef ▁off sh ore ▁is ▁a ▁significant ▁source ▁of ▁sand ▁particles . ▁Some ▁species ▁of ▁fish ▁that ▁feed ▁on ▁alg ae ▁attached ▁to ▁cor al ▁out cro ps ▁and ▁rocks ▁can ▁create ▁substantial ▁quantities ▁of ▁sand ▁particles ▁over ▁their ▁lifetime ▁as ▁they ▁n ib ble ▁during ▁feed ing , ▁dig est ing ▁the ▁organ ic ▁matter , ▁and ▁disc arding ▁the ▁rock ▁and ▁cor al ▁particles