Cloquet River Bridge Emergency Repair SOW.docx

Superior National Forest Cloquet River Bridge Emergency Repair Laurentian Ranger District Aurora, MN

US Department of Agriculture (USDA)

Statement of Work

Contents

Project Cloquet River Bridge Emergency Repair

General Information

1.0 Scope of Work

Emergency Repair: Install grout bags and grout in scour void underneath the footer to support center pier from rotation and bridge from collapsing.

2.0 Background

The Cloquet River Bridge is located on Forest Road 122 in Township 56N, Range 12W, Section 25 (47.3099N, 91.7964W) in St Louis County MN. The Cloquet River Bridge constructed in 1957, is 67 years old two span continuous concrete beam bridge with a center pier. Prior to the June 2024 storm event there were no structural deficiencies noted. It had a deck rating of 6 (fair) and substructure rating of 7 (good). Because it had no exposure to winter salting the bridge was not programmed for replacement as it was anticipated to have many more years of service life remaining.

Seasonal peak flow in the Cloquet River is typically between 1000-2000cfs. The June 18, 2024 Storm Event caused a peak flow of around 6000 cfs. The flooding appears to have overtopped road and bridge as the bridge deck was washed clean and there is debris on the road shoulder at bridge ends. There is major degradation and scour of the riverbed. There was a debris jam on the pier nose. A dive investigation found severe scour at the pier. The center pier footer is completely undermined for about 2/3 of it's length. (See attached undermining sketch.) It is assumed that the reinforced concrete superstructure (continuous over the pier) is currently supporting the pier from rotating into the scour hole. Without repairing the undermining prior to spring flows, it is feared the scour will increase and the bridge will collapse.

This project is intended stabilize the bridge until a replacement bridge can be funded, designed and constructed. The bridge is currently closed to all traffic and will remain closed to all traffic upon completion of the work.

Contractor Requirements

3.0 Technical Requirements / Tasks

Provide for and furnish all labor, superintendence, materials, tools, equipment, transportation, certificates, permits, insurance, temporary shoring or bracing, and other items necessary to install grout bags and grout.

· Install 1 grout bag under upstream nose of pier footer.

· Install 1 grout bag just downstream of the log wedged under the footer.

· Contractor must determine size of grout bags required for installation at locations indicated.

· Contractor must determine the quantity of grout required.

· A reconnaissance dive to measure and field verify void is recommended.

· Any shoring, bracing, or other safety measures will be incidental to the installation of the grout bags.

· Provide underwater pictures and/or video of the work, before, during and after installation of the grout bags.

4.0 Government Furnished

Government will provide copies of dive inspection reports, bridge design documents and bridge inspection reports for informational purposes only.

5.0 Deliverables / Schedule

The Intent of this project is to complete the emergency shoring and stabilization of the center pier as quickly as possible.

Key Deliverables

6.0 Travel

Travel to the project site is included in the mobilization/demobilization costs for the project.

7.0 Contractor’s Key Personnel

The Contractor must assign workers who are experienced in construction methods required to complete the described project.

8.0 Security Requirements

There are no specific Security Requirements for the project.

9.0 Data Rights

Data produced in the execution of the project (e.g., e‐mails, drawings, photos, videos, etc.) will be subject to FOIA requirements. The correspondence, drawings, sketches, photos, and video produced for the completion of the project are only intended to apply to the Cloquet River Bridge. Any Data produced may be used to determine the permanent repair or replacement of the Cloquet River Bridge.

10.0 Section 508 – Electronic and Information Technology Standards Supply of Information technology is not part of this contract, so Section 508 requirements are only required for project communication.

11.0 Payment

The quantities shall be paid for as lump sum quantities or by other methods of measure as listed in the SCHEDULE OF ITEMS. Such payment shall be considered full compensation for the complete project. The invoices must be submitted to the CO using the IPP System.

Additional Documents required to be submitted prior to final invoice processing are:

· Contract Release Form

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