, ▁New ▁York , ▁in ▁the ▁United ▁States . ▁Via ▁the ▁M ood na , ▁which ▁it ▁forms ▁at ▁a ▁confl u ence ▁with ▁C rom line ▁Creek ▁north ▁of ▁the ▁village ▁of ▁Washington ville , ▁its ▁waters ▁eventually ▁reach ▁the ▁Hudson ▁River . ▁ ▁The ▁Ot ter ▁Kill ▁flows ▁primarily ▁through ▁rural , ▁und e velop ed ▁areas ▁of ▁the ▁towns ▁of ▁G os hen , ▁Ham pton burgh ▁and ▁Blo oming ▁Gro ve . ▁Development ▁press ures ▁in ▁those ▁areas ▁have ▁led ▁the ▁state ▁Department ▁of ▁Environment al ▁Conserv ation ▁to ▁class ify ▁it ▁and ▁a ▁major ▁trib ut ary , ▁Black ▁M ead ow ▁Creek , ▁as ▁threatened ▁streams . ▁ ▁Cour se ▁The ▁Ot ter ▁Kill ▁traces ▁a ▁sem ic irc ular ▁route ▁through ▁the ▁north western ▁M ood na ▁valley . ▁It ▁r ises ▁from ▁the ▁north ▁end ▁of ▁G os hen ' s ▁Res er voir ▁# 2 ▁and ▁flows ▁generally ▁in ▁that ▁direction , ▁under ▁NY ▁ 1 7 . ▁Two ▁miles ▁from ▁its ▁source , ▁in ▁the ▁sw amps ▁east ▁of ▁the ▁village ▁of ▁G os hen , ▁it ▁receives ▁its ▁largest ▁trib ut ary , ▁Black ▁M ead ow ▁Creek . ▁It ▁continues ▁in ▁the ▁same ▁direction , ▁through ▁more ▁sw amps ▁surrounded ▁by ▁far ml and , ▁into ▁the ▁town ▁of ▁Ham pton burgh . ▁ ▁Just ▁east ▁of ▁the ▁Campbell ▁Hall ▁Metro - N orth ▁station , ▁the ▁stream ▁begins ▁to ▁b end ▁toward ▁the ▁east . ▁After ▁crossing ▁under ▁the ▁tracks