0 . ▁In ▁ 1 8 4 7 , ▁a ▁fl our ▁mill ▁and ▁a ▁saw ▁mill ▁were ▁built ▁on ▁Mos qu ito ▁Creek , ▁south west ▁of ▁the ▁present ▁site ▁of ▁Under wood . ▁In ▁ 1 8 5 0 , ▁the ▁fl our ▁mill ▁was ▁destroyed ▁by ▁a ▁flo od . ▁The ▁first ▁school ▁was ▁built ▁in ▁ 1 8 6 3 ▁and ▁soon ▁more ▁homes ▁were ▁built ▁near ▁the ▁school ▁and ▁saw ▁mill . ▁It ▁became ▁known ▁as ▁Down sv ille . ▁A ▁post ▁office ▁was ▁established ▁there . ▁ ▁With ▁the ▁coming ▁of ▁the ▁Chicago , ▁Rock ▁Island ▁and ▁Pacific ▁Rail road ▁in ▁ 1 8 6 9 , ▁the ▁town ▁of ▁Under wood ▁was ▁established ▁three ▁miles ▁n ortheast ▁of ▁Down sv ille , ▁which ▁was ▁later ▁abandoned ▁and ▁has ▁entirely ▁disappeared ▁( with ▁the ▁exception ▁of ▁a ▁c emetery ). ▁In ▁ 1 8 8 2 , ▁the ▁other ▁rail road ▁that ▁crossed ▁through ▁Nor walk ▁Township , ▁Chicago , ▁Mil w au kee ▁and ▁St . ▁Paul , ▁built ▁a ▁station ▁house , ▁ere cted ▁a ▁water ▁tank ▁and ▁laid ▁a ▁switch . ▁These ▁improvements ▁were ▁on ▁port ions ▁of ▁the ▁far ms ▁owned ▁by ▁two ▁men ▁and ▁their ▁far ms ▁were ▁to ▁be ▁survey ed ▁and ▁divided ▁into ▁town ▁lots . ▁The ▁name ▁Under wood ▁comes ▁from ▁the ▁name ▁of ▁the ▁first ▁engineer ▁to ▁run ▁a ▁train ▁over ▁the ▁Mil w au kee ▁tracks . ▁Two ▁far mers ▁cut ▁the ▁corn ▁stal ks ▁off ▁to