Each piece of equipment uses biodegradable hydraulic fluids, is fitted with low PSI tires to reduce ground disturbance and is pre-checked to ensure it is clean and free from leaks.
The Corps of Engineers is working in partnership with local, state and federal agencies, to include the Federal Emergency Management Agency, in response to the damage from Hurricane Helene. (U.S. Army photo by Stacey Reese/released) VIEW ORIGINAL
WESTERN NORTH CAROLINA – From the steep slopes of the Blue Ridge to the boggy lowlands of Transylvania County, U.S. Army Corps of Engineers crews and contractors continue to tread softly through a landscape reshaped by Hurricane Helene’s historic floods.
“Hurricane Helene was as much a geological event as a meteorological one,” said Col. Brad Morgan, commander of the USACE Wilmington District, who also leads the North Carolina debris cleanup mission. “The storm forever changed the physical landscape. We’re not just removing debris from public waterways – we’re helping heal the very environments in communities that were hit hardest. It’s a delicate balance.”
Hurricane Helene triggered landslides in North Carolina with 15 inches of rain in October 2024. Andrew Aceves, a geologist with the U.S. Army Corps of Engineers Pittsburgh District, and Dan Vellone, a geotechnical engineer with Sacramento District, volunteered for a FEMA mission assignment to support a task force to assess landslide sites in late February 2025. The team provided site assessments and vetted landowner reconstruction plans, all under tight deadlines. They looked at soil types, slope degrees, drainage, and low spots that could catch water. They also reviewed maps and drone footage, all to determine if a secondary collapse might happen and if an area was safe to rebuild and for communities to return.
(U.S. Army Corps of Engineers photo) VIEW ORIGINAL
Hurricane Helene triggered landslides in North Carolina with 15 inches of rain in October 2024. Andrew Aceves, a geologist with the U.S. Army Corps of Engineers Pittsburgh District, and Dan Vellone, a geotechnical engineer with Sacramento District, volunteered for a FEMA mission assignment to support a task force to assess landslide sites in late February 2025. The team provided site assessments and vetted landowner reconstruction plans, all under tight deadlines. They looked at soil types, slope degrees, drainage, and low spots that could catch water. They also reviewed maps and drone footage, all to determine if a secondary collapse might happen and if an area was safe to rebuild and for communities to return.
(U.S. Army Corps of Engineers photo) VIEW ORIGINAL
USACE is currently operating in 16 counties, with as many as four new counties expected to be added soon. Across these jurisdictions, the Corps has deployed contractors who specialize in both environmental compliance and field efficiency. Contractors handling stream debris removal in Transylvania County has earned praise from USACE officials – along with others in neighboring counties – for combining precise fieldwork with environmentally sensitive practices.
This critical work will remove, reduce and dispose of debris from coastal waters where the debris impedes navigation or produces a hazard to public safety.
(U.S. Army Corps of Engineers photo by Charles Delano) VIEW ORIGINAL
Key to their work: heavy forestry equipment outfitted with biodegradable hydraulic fluid – a critical step toward reducing long-term pollution in sensitive environments. This upgrade is vital because even well-maintained forestry equipment – operating at pressures of up to 5,000 PSI – can suffer pinhole leaks or seal failures in hydraulic lines, which power harvesters and forwarder boom arms and grapple claws.
“Instead of leaving a legacy of contamination, these fluids quickly become lunch for microbes,” said Ryan Weaver, USACE’s waterway debris mission manager for Hurricane Helene.
Biodegradable hydraulic fluid – made from vegetable oils and synthetic esters – begins breaking down within days, is 90% degraded into harmless byproducts within 60 days, and is fully assimilated into soil biology with no residual toxicity within six months. By contrast, traditional petroleum-based hydraulic fluid can persist in soil and water for 20 years or more, posing a risk to wildlife, groundwater, and wetland ecosystems.
Site planning with ecology in mind
Before work begins in any sensitive location during the Helene debris cleanup, USACE teams partner with biologists and Quality Assurance specialists to assess local wildlife and habitat conditions. In some areas, drones are deployed to scout ahead in cleanup zones, enabling crews to plan access routes that minimize disruption to streambanks and shoreline vegetation. This approach allows USACE to limit or eliminate streambank clear-cutting, requiring only strategic tree removals to reach difficult debris locations.
With many waterways rerouted or clogged by vegetation and household debris mixed within a slurry of sediment, traditional access points are often gone. In areas where forestry equipment doesn’t have direct access to debris in streams, rivers, and lakes, the least disruptive method is to remove the wreckage directly from within the waterway. This is done using specialized equipment designed to preserve the waterway’s natural hydrology, while minimizing further erosion and turbidity.
Each piece of equipment uses biodegradable hydraulic fluids, is fitted with low PSI tires to reduce ground disturbance and is pre-checked to ensure it is clean and free from leaks.
The Corps of Engineers is working in partnership with local, state and federal agencies, to include the Federal Emergency Management Agency, in response to the damage from Hurricane Helene. (U.S. Army photo by Stacey Reese/released) VIEW ORIGINAL
The mix of trees, vegetation, household debris, and small amounts of sediment from individual sites is then congregated at larger Temporary Offload Staging sites, or TOLS. At these sites, debris is laid on timber matting – a layer that creates a stable platform, which also allow excavator claws to pick up material to be placed into various dump trucks, without gouging the soil beneath. Once TOLS sites are cleared, the timber matting is removed and the area is reseeded to promote regrowth of vegetation to the site.
Debris from TOLS sites is congregated once again at regional Temporary Debris Management Sites, where the debris is sorted into various waste streams for recycling or disposal. This method minimizes direct impact to the 3,936 sites identified by county officials across western North Carolina from where the debris was originally removed.
“We’re working with the land, not against it,” said Weaver. “Every operational detail is designed to reduce our footprint in critical habitats.”
Holding the line on environmental standards
The effort is fully coordinated with FEMA, the North Carolina Department of Environmental Quality, and other state, county, and local jurisdictions. Workers in the field consult with FEMA Environmental Historic Preservation experts to ensure extremely sensitive sites receive special attention to minimize environmental impact.
USACE conducts environmental training every one to two weeks for contractors and subcontractors working on the Helene debris mission. A full-time regulatory specialist from the USACE Wilmington District is embedded in the mission teams. Subcontractors that fail to follow these protocols are stood down for retraining – and can be dismissed entirely.
“Our commitment is simple,” said Col. Morgan. “Over-clearing is not tolerated, nor is reckless removal of debris without consideration of the ecological impact. Contractors that exceed limits receive warnings or are removed from the job. We’re here to help this region recover – but we’re doing it the right way: with science, safety, and respect for the environment.”
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