On March 8th and 9th, engineers designing the new East End Bridge over the Ohio River in Jefferson County will use balloons to mark the approximate location and height of the approach to the proposed approach to the bridge: Business First: Balloons will simulate East End bridge approach (Feb. 28, 2005) 

March 9, 2005 Update: More information: Jeffersonville (Ind.) Evening News: Engineers will use balloons to show bridge approach elevation (March 6, 2005)