Lake Street Retaining Wall

The options for repairing the retaining wall next to the old municipal building on W Lake Street. The costs are still approximate, but they give an order of magnitude that these options should come back at.

1. Eliminate the retaining wall and grade a grassed or landscaped 4:1 slope off the edge of the sidewalk on West Lake Street. This would take up approximately 25-feet of the existing parking area. The parking area would need to be reconfigured, and some stalls would be lost up against the building. A small wall would still be needed at the old muni building to maintain access to the basement doorway. A new connection between the parking lot and Lake Street would be constructed. An inlet already exists in the pavement north of this area for drainage. Cost for grading, removals, fill material, new stairway and restoration is approximately $12,000.

2. Provide a new cast-in-place concrete wall with a railing. The wall would be approximately 5-feet tall (exposed) with a 4-foot frost wall and footing. This would require removal of the sidewalk on Lake Street as well as some of the pavement in the parking lot to construct the footing. Cost for the wall, railing, sidewalk R&R, wall removal, and CGC investigation is approximately $40,000.

3. Provide a modular block wall with a railing. The wall would be approximately 5-feet tall (exposed) with 1-foot buried. This option would also require removal of the sidewalk on Lake Street for geogrid reinforcement. Cost for the wall, railing, sidewalk R&R, wall removal, and CGC investigation is approximately $36,000.