1. Lake Park North Lion Bridge Rehabilitation Milwaukee, Wisconsin Darrell Berry, PE, SE Approaches to Historic Bridge Rehabilitation Case Study #2 1

2. Lake Park North Lion Bridge Steel arch with concrete deck Originally built in 1896, narrowed in the 1960s Length: 90 feet; Width: 10 feet clear Single span steel arch Design Live Load: 85 psf or 15,000 lb. vehicle Case Study #2 North Lion Bridge Lake Michigan 2 Milwaukee, Wisconsin

3. Lake Park North Lion Bridge Rehabilitation Owner: Milwaukee County Department of Parks, Recreation and Culture Design Engineer: Mead & Hunt, Inc. General Contractor: Vista Design & Construction, LLC Project Cost: $1.6 Million Project dates: started Feb 2009, completed Oct 2009. Case Study #2 3

4. Significant Issues Associated With Project Case Study #2 4 1. Arch Structure 2. Railing 3. Stone Facing on Abutments 4. Lion Statues

5. 1. Steel arch structure, including bearings & concrete deck 5

6. How Arch Issue Was Resolved Case Study #2 6 Deteriorated structural steel was removed and replaced, with details matching original. Bearings were removed and replaced. Concrete deck was removed and replaced Precast concrete panels Cast-in-place concrete surface

7. 2. Metal Railings Case Study #2 7

8. How Railing Issue Was Resolved Case Study #2 Railings were removed from bridge and delivered to a fabrication shop. New finials were added and made larger to fill the openings. Edges were welded to uprights. Railings were painted and reinstalled. 8

9. 3. Stone facing on abutments Case Study #2 9

10. How Stone Facing Issue Was Resolved Case Study #2 Missing stones were replaced with matching stones. Entire abutments were tuckpointed, with color to match existing. All surfaces were gently cleaned to remove moss and dirt. 10

11. 4. Lion Statues Case Study #2 11

12. How Lion Statue Issue Was Resolved Case Study #2 110 year old statues were in good condition with minimal graffiti. Cleaning used a gentle process with water and light power wash. Digital 3D image will be prepared in near future. 12

13. Lessons Learned/Conclusions Rehabilitated bridge is part of beloved, historic park. Bridge and lion statues are enduring symbols of a celebrated Milwaukee landmark. Cooperation and collaboration between all parties lead to an extremely successful, award-winning project. Case Study #2 13