Washington County Engineer David Patterson says a $12 million plan to improve secondary roads would provide a 50 year solution, if not more. Tuesday night, Patterson addressed more than 50 area residents at a special forum of the Washington County Board of Supervisors at the ISU Extension Building on the fairgrounds. County Treasurer Jeff Garrett said the current plan would tax rural residents at 78, city residents at 13% of the county’s $8 million share. Based on last year’s numbers, a $150,000 rural residential property would pay “about $100 a year”, a similar city residence would pay $35 and an average 40 acre track of land would pay $38. Garrett said the estimates were “conservative” and actual tax amounts could be lower.