▁recent ▁gla ci ation . ▁U pl ift ▁and ▁fault ing ▁in ▁combination ▁with ▁gla ci ation ▁have ▁been ▁the ▁dominant ▁processes ▁which ▁have ▁created ▁the ▁tall ▁pe aks ▁and ▁deep ▁valle ys ▁of ▁the ▁North ▁C asc ades ▁area . ▁ ▁H idden ▁Lake ▁Pe ak ▁Look out ▁ ▁The ▁g able ▁roof ▁single - room ▁ 1 4 ' ▁by ▁ 1 4 ' ▁look out ▁was ▁built ▁by ▁the ▁U . S . ▁Forest ▁Service ▁in ▁ 1 9 3 1 ▁and ▁was ▁staff ed ▁until ▁ 1 9 5 8 , ▁when ▁many ▁fire ▁look outs ▁in ▁the ▁North ▁C asc ades ▁were ▁closed . ▁In ▁ 1 9 6 1 ▁Dr . ▁Fred ▁Dar v ill ▁and ▁the ▁Sk agit ▁Al pine ▁Club ▁obtained ▁a ▁special ▁use ▁permit ▁to ▁restore ▁and ▁maintain ▁the ▁structure . ▁ ▁A ▁volunte er ▁group ▁now ▁maintain s ▁the ▁look out , ▁which ▁is ▁open ▁to ▁the ▁public ▁on ▁a ▁first - come - first - serve ▁basis ▁for ▁over night ▁use . ▁The ▁look out ▁is ▁generally ▁accessible ▁from ▁July ▁until ▁October , ▁as ▁determined ▁by ▁snow ▁conditions . ▁ ▁National ▁Register ▁The ▁H idden ▁Lake ▁Pe ak ▁Look out ▁was ▁added ▁to ▁the ▁National ▁Register ▁of ▁Historic ▁Places ▁on ▁July ▁ 1 4 , ▁ 1 9 8 7 , ▁and ▁is ▁also ▁on ▁the ▁National ▁Historic ▁Look out ▁Register . ▁▁▁ ▁Str ucture ▁- ▁ID ▁# 8 7 0 0 1 1 8 4 ▁North ▁C asc ades ▁National ▁Park