▁of ▁Me ek er ▁Run , ▁the ▁p H ▁ranges ▁between ▁ 3 . 8 8 ▁and ▁ 6 . 3 6 . ▁The ▁average ▁p H ▁here ▁is ▁ 4 . 9 7 . ▁At ▁the ▁stream ' s ▁head w aters , ▁the ▁minimum ▁p H ▁is ▁ 3 . 4 8 ▁and ▁the ▁maximum ▁p H ▁is ▁ 6 . 3 0 . ▁The ▁average ▁is ▁ 4 . 9 1 . ▁ ▁Geography ▁and ▁ge ology ▁The ▁elev ation ▁near ▁the ▁mouth ▁of ▁He ber ly ▁Run ▁is ▁ ▁above ▁sea ▁level . ▁ ▁There ▁are ▁some ▁rav ines ▁in ▁the ▁vic inity ▁of ▁He ber ly ▁Run . ▁ ▁Up stream ▁of ▁the ▁water falls , ▁there ▁are ▁smooth ▁sand stone ▁out cro ppings ▁in ▁the ▁stre amb ed ▁of ▁He ber ly ▁Run . ▁The ▁stream ▁has ▁created ▁a ▁" ste ep ▁and ▁rug ged " ▁g len ▁in ▁the ▁plate au ▁that ▁it ▁is ▁located ▁on . ▁ ▁W aters hed ▁ ▁The ▁waters hed ▁of ▁He ber ly ▁Run ▁has ▁an ▁area ▁of ▁. ▁It ▁is ▁difficult ▁to ▁access ▁the ▁stream ▁by ▁road . ▁ ▁There ▁are ▁a ▁number ▁of ▁water falls ▁on ▁He ber ly ▁Run . ▁These ▁include ▁Lewis ▁F alls , ▁T win ▁F alls , ▁Big ▁F alls ▁and ▁several ▁others . ▁Most ▁of ▁these ▁water falls ▁are ▁fairly ▁small . ▁Big ▁F alls ▁is ▁ ▁high ▁and ▁Lewis ▁F alls ▁is ▁ ▁high . ▁The ▁upper ▁T win ▁F alls