Madison County Engineer, Winterset, IA No description specified. 1-2 (2 Records) Documents A Phase I Archaeological Investigation of Bridge Replacement ( FHWA # 234920) and Grading Project BRS-6041(2)--60-61, Madison County, Iowa (1992) A Phase I Archaeological Investigation of Bridge Replacement (Fhwa# 234970) and Limited Grading Project 2B-100-297, Madison County, IA (1992)