1. Presentors: Tom Hardinger – Wisconsin DOT Eugene Hietpas – Collins Engineers Inc. This presentation and its contents may not be duplicated or reproduced without the expressed written consent of Collins Engineers, Inc.

2. NC Region Various Structures – Structures B-37-0187, B-71-0018, B-49-0090 Background Information Design Phase Construction Phase As-Builts

3. Background Information Project included 3 bridges over Wisconsin River (Marathon, Portage and Wood Counties in central Wisconsin). Substructure units are conventional seal, footing and pier walls. Major flood events 2008, 2010 and 2011. Post-flood dive inspections revealed major scour issues with streambed and/or substructure undermining. Project initiated in 2011 and built in late 2012.

4. B-37-187, STH 34, Knowlton Built 1969. Multi-span steel girder spans. 20-38 water depth. 8-10 streambed degradation during 2008 flood exposed seal-to-rock interface. Mitigated piers 2 and 3.

5. B-49-90, CTH HH, Stevens Point Built 1999. Multi-span pre- stressed girder spans. 8-15 water depth. Pier 4 Seal undermining at upstream nose.

6. B-49-90 Existing Condition

7. B-71-18, STH 73, Nekoosa Built 1962. Multi-span steel girder spans. 15-22 water depth. Localized scour at piers 2 thru 6.

8. Design Considerations Permanent vs. Temporary Repairs. Alternatives. Conventional Riprap placement. Articulated grout mats/grout bags and structural grout. Traffic disruptions. Environmental. Project Inspection - Most work underwater.

9. Design Challenges Limited WDOT history/experience (design and construction). HEC 23 guidelines. Input from other states: Montana, Iowa, MN. Input from industry. Environmental. Aquatic bed impacts. Development of Specifications.

10. Project Detail of Scour Repairs

11. Project 1009-45-65 Designed by NCR and BOS. Let August 14, 2012. Cost $532,111. Scour Repair Grout: $4,829/CY (6 CY). Grout Bags: $482/CY (402 CY). 4 Grout Mats: $837/CY (256 CY). Contractor: JF Brennan Company, La Crosse.

12. NC Region Various Structures – Structures B-37-0187, B-71-0018, B-49-0090 Construction 3D Imaging Design Phase/Pre-construction As-Builts

13. The Challenge Can You See Me Now?

16. Installation/Layout Issues

17. As-Builts

20. Questions Contact: Eugene Hietpas ehietpas@collinsengr.com Tom Hardinger Thomas.hardinger@dot.wi.gov