Structural Study of Existing Lafayette Bridge No. 9800

The scope of work for the Lafayette Bridge Study requires the investigation of four bridge widening options. Options are defined in terms of three criteria: horizontal alignment, deck geometry, and whether or not river construction operations (piles footings, pier shafts, cofferdams, etc.) are allowed. The options are named Option 1a, 1b, 2, and 3. The distinguishing characteristics of each option are as follows:

• Option 1a: Symmetrical widening about the existing centerline, bridge cross sections meet full geometric standards, foundation work in the river is not allowed.
• Option 1b: Symmetrical widening about the existing centerline, bridge cross sections meet full geometric standards, foundation work in the river is allowed.
• Option 2: Symmetrical widening about the existing centerline, bridge cross sections do not meet full geometric standards, foundation work in the river is not allowed.
• Option 3: Northbound bridge on a new alignment east of the existing bridge, southbound bridge centered on the existing centerline, bridge cross sections meet full geometric standards, foundation work in the river is required.