▁The ▁Mont gom ery ▁Bell ▁T unnel ▁is ▁located ▁in ▁a ▁unit ▁of ▁Har p eth ▁River ▁State ▁Park , ▁north ▁of ▁the ▁town ▁of ▁King ston ▁Spr ings , ▁Tennessee . ▁ ▁In ▁this ▁area , ▁the ▁Har p eth ▁River ▁under go es ▁a ▁series ▁of ▁me and ers . ▁ ▁In ▁one ▁of ▁these , ▁two ▁parts ▁of ▁the ▁river ▁are ▁quite ▁close ▁after ▁a ▁length y ▁ox bow , ▁known ▁as ▁the ▁N arrow s ▁of ▁the ▁Har p eth . ▁ ▁The ▁tunnel ▁runs ▁roughly ▁north - s outh ▁across ▁this ▁is th mus . ▁ ▁It ▁is ▁ ▁in ▁length , ▁and ▁is ▁d ug ▁entirely ▁through ▁lim estone ▁rock . ▁ ▁Ne ither ▁the ▁tunnel ▁nor ▁its ▁port als ▁are ▁l ined ▁in ▁any ▁way . ▁ ▁The ▁tunnel ' s ▁profile ▁shape ▁that ▁of ▁a ▁rectangle ▁to pped ▁by ▁a ▁segment ed ▁arch , ▁and ▁is ▁generally ▁ ▁high ▁and ▁ ▁wide . ▁ ▁The ▁entrance ▁portal ▁is ▁ ▁high ▁and ▁ ▁wide ▁and ▁the ▁exit ▁portal ▁is ▁ ▁high ▁and ▁ ▁wide . ▁ ▁The ▁tunnel ▁has ▁suffered ▁some ▁damage ▁over ▁the ▁years ▁due ▁to ▁er os ive ▁forces . ▁ ▁Mont gom ery ▁Bell , ▁an ▁entrepr ene ur ▁from ▁Pennsylvania ▁who ▁was ▁involved ▁in ▁iron ▁found ries ▁in ▁central ▁Tennessee , ▁purchased ▁the ▁land ▁in ▁this ▁area ▁in ▁ 1 8 1 8 . ▁ ▁Rec ogn izing ▁the ▁potential ▁to ▁apply ▁water ▁power ▁to ▁the ▁process ▁of ▁producing ▁wr ought ▁iron