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Crabtree Creek Trail Retaining Wall Repair

Last updated Jul. 26, 2018 - 10:08 am
  • Planning
  • Design
  • Construction
  • Completed
  • Greenway & Retaining Walls
  • $171,000.00
  • Midtown
  • Parks, Recreation and Cultural Resources (Lead)
  • Wetherill Engineering, Inc (Design, Bidding Assistance and Construction Administration)

Current Activity

The City of Raleigh has closed the Crabtree Creek Greenway at mile marker 12 between the trail access at North Hills Drive and the Mine Creek Trail and Crabtree Creek Greenway intersection. This map shows the location of the closed section of trail and the detour on North Hills Drive. High levels of rain and stormwater runoff caused excessive erosion and damage to the streambank supporting the retaining wall adjacent to Crabtree Creek and has made this section of the Crabtree Creek Greenway hazardous for public access. These photos are of the retaining wall in its failing condition. 
The detour will follow the southern side of North Hills Drive for a half-mile and connect to the Mine Creek Trail access. Trail users can continue north, across North Hills Drive to Shelly Lake Park, or south, along the Mine Creek Trail, to reconnect with the Crabtree Creek Trail at the “Z” Bridge, structure #37. For questions about this this project or closure please contact David Bender at 919.996.4798 or email david.bender@raleighnc.gov.
The City of Raleigh has closed the Crabtree Creek Greenway at mile marker 12 between the trail access at North Hills Drive and the Mine Creek Trail and Crabtree Creek Greenway intersection. This map shows the location of the closed section of trail and the detour on North Hills Drive. High levels of rain and stormwater runoff caused excessive erosion and damage to the streambank supporting the retaining wall adjacent to Crabtree Creek and has made this section of the Crabtree Creek Greenway hazardous for public access. These photos are of the retaining wall in its failing condition. 

The detour will follow the southern side of North Hills Drive for a half-mile and connect to the Mine Creek Trail access. Trail users can continue north, across North Hills Drive to Shelly Lake Park, or south, along the Mine Creek Trail, to reconnect with the Crabtree Creek Trail at the “Z” Bridge, structure #37. For questions about this this project or closure please contact David Bender at 919.996.4798 or email david.bender@raleighnc.gov.

Summary

In February 2018, an initial approach to replacing the existing retaining walls along the Crabtree Creek Greenway was to utilize segmental block wall construction. Plans and bid documents were prepared and the project was let to construction, but prior to the project being awarded severe bank scour occurred at the project site. The scour of the banks made the use of segmental block walls unfeasible and another approach had to be investigated to replace the failing walls.
The revised design approach to replacing the wall adjacent to Crabtree Creek will utilize piles embedded into the rock below the stream and a sheet pile wall placed behind the piles. To counteract overturning of the wall, tie back anchors will most likely be required.
In February 2018, an initial approach to replacing the existing retaining walls along the Crabtree Creek Greenway was to utilize segmental block wall construction. Plans and bid documents were prepared and the project was let to construction, but prior to the project being awarded severe bank scour occurred at the project site. The scour of the banks made the use of segmental block walls unfeasible and another approach had to be investigated to replace the failing walls.

The revised design approach to replacing the wall adjacent to Crabtree Creek will utilize piles embedded into the rock below the stream and a sheet pile wall placed behind the piles. To counteract overturning of the wall, tie back anchors will most likely be required.

History

The Capital Area Greenway System was first adopted by City Council in 1976. This plan proposed a system of linear parks located primarily along rivers, streams, and creeks, and included the opportunity for an interconnected system of pedestrian trails across the region.

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