Los Angeles County Public Works has begun emergency sediment hauling operations to the Manning Pit Sediment Placement Site in Irwindale as part of ongoing flood control and storm preparedness efforts following recent storms.
The project is designed to remove large volumes of sediment, dirt, rocks and mud that accumulated in debris basins across Los Angeles County during recent storm events. County officials say the work is necessary to restore debris basin capacity ahead of future storms and reduce the risk of flooding and debris flows in downstream communities.
According to Public Works, sediment hauling to the Manning Pit site could begin as early as Jan. 26, 2026, and is expected to last approximately 16 weeks, weather permitting. Work will generally take place Monday through Friday from 7 a.m. to 4 p.m., with Saturday operations scheduled as needed. Additional hauling may occur following subsequent storm events.
Flood Control System Maintenance
Los Angeles County operates an extensive flood control system that includes debris basins, dams and related infrastructure. During storms, runoff from hillsides carries sediment into these basins. Without routine removal, capacity is reduced, increasing the risk of flooding during future rainfall.
County officials emphasized that only natural materials such as dirt, rocks and mud are being transported to the Manning Pit Sediment Placement Site. The material does not include residential debris, household hazardous waste or fire debris.
The Manning Pit site serves as a designated location to safely receive sediment removed from debris basins throughout the region. Public Works said the operation is critical to maintaining public safety and protecting neighborhoods vulnerable to flooding.
Haul Routes And Community Impacts
Sediment will be transported along a designated haul route that includes Irwindale Avenue, West Gladstone Street and Vincent Avenue before reaching the Manning Pit site. County officials said haul routes were selected to minimize impacts to residential areas while maintaining efficient operations.
To reduce disruption, Public Works will oversee the hauling operation to ensure compliance with traffic and safety regulations. Water trucks will be used for dust control, and all haul trucks will be covered with tarps while traveling on public roads. Street sweepers will regularly clean residential streets along the haul route.
Residents may notice increased truck traffic during work hours, particularly in portions of Irwindale near the designated route. Public Works said crews are trained to operate safely and efficiently to limit noise and traffic delays where possible.
Information And Public Access
Residents with questions about the project may contact Los Angeles County Public Works during regular business hours. After-hours assistance is available through the county’s 24-hour dispatch center.
County officials noted that reasonable accommodations under the Americans with Disabilities Act and Title VI are available, including interpreting services and materials in other languages, upon request.
For residents of Irwindale and nearby San Gabriel Valley communities, the project represents a preventative measure aimed at reducing flood risk before the next storm season. Officials said maintaining debris basin capacity remains a key part of the county’s broader flood protection strategy.
More information about the sediment management program is available through Los Angeles County Public Works at https://pw.lacounty.gov/projects/sediment-management/.
