9 . ▁ ▁The ▁upper ▁reaches ▁of ▁the ▁waters hed ▁of ▁Spring ▁Brook ▁are ▁mountain ous ▁and ▁sw amp y . ▁Further ▁down stream , ▁the ▁stream ▁flows ▁through ▁a ▁water ▁gap ▁in ▁the ▁Mo os ic ▁Mountains . ▁Sand stone , ▁sh ale , ▁and ▁some ▁coal ▁are ▁present ▁in ▁the ▁vic inity ▁of ▁the ▁stream . ▁It ▁has ▁been ▁channel ized ▁in ▁a ▁concrete ▁channel ▁for ▁part ▁of ▁its ▁length ▁and ▁is ▁the ▁main ▁source ▁of ▁flo oding ▁in ▁Spring ▁Brook ▁Township , ▁L ack aw anna ▁County . ▁The ▁stream ▁is ▁the ▁second - larg est ▁trib ut ary ▁of ▁the ▁L ack aw anna ▁River . ▁Res er voir s ▁on ▁Spring ▁Brook ▁include ▁the ▁Spring ▁Brook ▁In take , ▁the ▁N es b itt ▁Res er voir , ▁the ▁Wat res ▁Res er voir . ▁There ▁are ▁three ▁d ams ▁on ▁the ▁stream . ▁The ▁waters hed ▁is ▁mainly ▁for ested , ▁with ▁only ▁a ▁small ▁amount ▁of ▁urban ▁land . ▁ ▁In ▁the ▁past , ▁indust ries ▁in ▁the ▁waters hed ▁of ▁Spring ▁Brook ▁included ▁tim ber ing , ▁coal ▁min ing , ▁and ▁agricult ure . ▁Two ▁rail ro ads ▁also ▁passed ▁through ▁the ▁waters hed ▁in ▁the ▁early ▁ 1 9 0 0 s , ▁at ▁least ▁one ▁of ▁which ▁was ▁established ▁by ▁the ▁ 1 8 8 0 s . ▁The ▁stream ' s ▁waters hed ▁has ▁served ▁as ▁a ▁water ▁supply ▁since ▁at ▁least ▁the ▁early ▁ 1 9 0 0 s ▁and