▁Over ▁ 3 0 0 ▁miles ▁behind ▁it , ▁lies ▁the ▁Glen ▁C any on ▁Dam . ▁In ▁spring , ▁rising ▁temper atures ▁trigger ▁sur ging ▁flo od water ▁from ▁mel ting ▁snow ▁and ▁ice ▁that ▁races ▁towards ▁the ▁dam . ▁It ▁reaches ▁the ▁Glen ▁C any on ▁Dam , ▁the ▁sp ill ways ▁let ▁some ▁of ▁the ▁water ▁out , ▁but ▁the ▁t unn els ▁built ▁into ▁the ▁dam ▁fill ▁with ▁high ▁pressure ▁b ub bles ▁that ▁cause ▁high ▁pressure ▁explos ions ▁and ▁eat ▁through ▁the ▁dam . ▁Con crete ▁ram ps ▁once ▁prevent ed ▁this , ▁but ▁now ▁they ▁have ▁r usted ▁into ▁w re cks ▁combined ▁with ▁water ▁se eping ▁through ▁the ▁cra cks ▁causing ▁er os ion . ▁This ▁causes ▁the ▁dam ▁to ▁ultimately ▁collapse . ▁the ▁flo od ▁races ▁down stream ▁towards ▁the ▁Ho over ▁Dam . ▁The ▁flo od ▁simply ▁flows ▁over ▁the ▁dam , ▁forming ▁a ▁ro aring ▁cas cade ▁of ▁water ▁that ▁th und ers ▁down stream , ▁swe eping ▁away ▁other ▁d ams ▁and ▁over wh el ming ▁everything ▁in ▁the ▁way . ▁For ▁the ▁first ▁time ▁in ▁centuries , ▁the ▁Colorado ▁River ▁once ▁again ▁reaches ▁the ▁G ulf ▁of ▁California ▁as ▁a ▁flo od , ▁not ▁a ▁stream , ▁and ▁rev ital izes ▁to ▁a ▁vast ▁est u ary ▁full ▁of ▁animal ▁life . ▁ ▁The ▁coast ▁of ▁Louisiana ▁is ▁res h aped ▁as ▁the ▁Mississippi ▁River ▁is ▁fre ed ▁from ▁the ▁d ams ' ▁g rip . ▁Old ▁cod fish ▁reach ▁six