▁Lake . ▁Many ▁cre eks ▁and ▁bro oks ▁and ▁spr ings ▁fed ▁into ▁Green ▁Lake , ▁whose ▁out let ▁was ▁on ▁the ▁east ▁side ▁of ▁the ▁route ▁of ▁R aven na ▁Bou lev ard , ▁in ▁a ▁deep ening ▁rav ine ▁which ▁became ▁Cow en ▁and ▁R aven na ▁par ks . ▁ ▁R aven na ▁Creek ' s ▁original ▁source ▁was ▁from ▁Green , ▁Hall er , ▁and ▁B itter ▁la kes , ▁then ▁the ▁Cow en ▁Park ▁rav ine ▁west ▁wall ▁when ▁the ▁waters hed ▁was ▁di vert ed ▁to ▁se wers ▁( 1 9 0 8 – 1 9 4 8 ). ▁The ▁water ▁table ▁is ▁relatively ▁shall ow , ▁held ▁by ▁the ▁extensive ▁layer ▁of ▁cl ays ▁that ▁under lay ▁the ▁met ro ▁region . ▁The ▁cre ek ▁source ▁is ▁actually ▁se eping ▁from ▁the ▁original ▁west ▁wall ▁of ▁the ▁rav ine , ▁even ▁though ▁the ▁g ul ch ▁has ▁been ▁partially ▁filled ▁at ▁the ▁south west ▁corner ▁of ▁Cow en ▁Park . ▁The ▁ins cription ▁on ▁the ▁gateway ▁to ▁Cow en ▁Park ▁states , ▁" In ▁memory ▁of ▁Charles ▁Cow en , ▁who ▁in ▁ 1 9 0 6 ▁gave ▁to ▁the ▁City ▁of ▁Seattle ▁the ▁twelve ▁acres ▁compr ising ▁this ▁park ." ▁ ▁For ▁many ▁dec ades ▁of ▁Seattle ▁city ▁history , ▁the ▁R aven na ▁Park ▁rav ine ▁had ▁been ▁ignored ▁by ▁log gers ▁and ▁far mers ▁and ▁still ▁possessed ▁full ▁old - g row th ▁tim ber ▁rising ▁nearly ▁. ▁The ▁trees ▁remained ▁through ▁the