, ▁west ▁of ▁Cas cade ▁Lock s , ▁Oregon . ▁The ▁ ▁property , ▁containing ▁an ▁old - g row th ▁forest , ▁is ▁located ▁on ▁the ▁south ▁side ▁of ▁Inter state ▁ 8 4 ▁at ▁approximately ▁mile point ▁ 4 2 . 5 , ▁and ▁was ▁not ▁accessible ▁by ▁motor ▁vehicle ▁since ▁I - 8 4 ▁was ▁built ▁in ▁ 1 9 6 0 . ▁However , ▁with ▁the ▁opening ▁of ▁the ▁E agle ▁Creek - C as cade ▁Lock s ▁segment ▁of ▁the ▁Historic ▁Columbia ▁River ▁Highway ▁State ▁Tra il ▁in ▁ 1 9 9 8 , ▁it ▁has ▁become ▁easily ▁accessible ▁by ▁foot ▁or ▁b icy cle . ▁The ▁park ▁is ▁on ▁a ▁tri angular ▁lot , ▁completely ▁surrounded ▁by ▁I - 8 4 ▁and ▁the ▁Mount ▁H ood ▁National ▁Forest . ▁ ▁The ▁park ▁was ▁acquired ▁in ▁ 1 9 2 3 ▁from ▁the ▁Oregon - W ashington ▁Rail road ▁and ▁Navigation ▁Company ▁by ▁the ▁Park s ▁Division ▁of ▁the ▁State ▁Highway ▁Department , ▁which ▁named ▁it ▁for ▁Philip ▁H . ▁Sher idan . ▁It ▁served ▁as ▁a ▁way side ▁on ▁US ▁ 3 0 ▁- ▁the ▁Historic ▁Columbia ▁River ▁Highway ▁- ▁until ▁ 1 9 6 0 , ▁when ▁the ▁new ▁I - 8 4 ▁fre ew ay ▁replaced ▁the ▁old ▁road , ▁cutting ▁off ▁access ▁except ▁through ▁the ▁national ▁forest . ▁As ▁part ▁of ▁the ▁rest oration ▁of ▁the ▁old ▁highway , ▁the ▁Federal ▁Highway ▁Administration ▁re built ▁the ▁abandoned ▁E agle ▁Creek - C as cade