▁dam ▁forms ▁Lake ▁Man ass as , ▁which ▁is ▁the ▁primary ▁water ▁supply ▁for ▁the ▁city ▁of ▁Man ass as . ▁ ▁Park s ▁▁ ▁Sand y ▁Run ▁Regional ▁Park ▁is ▁at ▁Fair f ax ▁Station ▁and ▁consists ▁of ▁the ▁n ort he astern ▁arm ▁of ▁the ▁Occ o qu an ▁Res er voir . ▁The ▁park ▁is ▁used ▁exclus ively ▁for ▁the ▁education , ▁practice , ▁and ▁competition ▁of ▁row ing . ▁The ▁high ▁schools ▁who ▁use ▁this ▁park ▁for ▁row ing ▁are ▁members ▁of ▁the ▁Virginia ▁Sch ol astic ▁Row ing ▁Association ▁( V AS RA ). ▁The ▁member ▁schools ▁which ▁call ▁this ▁park ▁their ▁home ▁are ▁Robinson ▁Second ary ▁School , ▁W . ▁T . ▁Wood son ▁High ▁School , ▁Thomas ▁Jefferson ▁High ▁School ▁for ▁Science ▁and ▁Technology , ▁James ▁Mad ison ▁High ▁School , ▁Fair f ax ▁High ▁School , ▁Oak ton ▁High ▁School , ▁West ▁Spring field ▁High ▁School , ▁Lang ley ▁High ▁School , ▁J . ▁E . ▁B . ▁Stuart ▁High ▁School , ▁and ▁South ▁County ▁Second ary ▁School . ▁ ▁F ount ain head ▁Regional ▁Park ▁is ▁also ▁in ▁Fair f ax ▁Station , ▁further ▁up river ▁from ▁Sand y ▁Run ▁Regional ▁Park , ▁past ▁Bull ▁Run . ▁Lake ▁Br add ock ▁Second ary ▁School , ▁West field ▁High ▁School ▁and ▁ ▁( V ir gin ia ) ], ▁also ▁V AS RA ▁members , ▁use ▁the ▁park ▁for ▁row ing . ▁ ▁The ▁Occ o qu an ▁River ▁is ▁border ed ▁by ▁three ▁par