Sediment Removal Hauling from Devils Gate Dam, Stopped for Fire Hazard Concerns, Set to Resume Monday

Published : Sunday, October 13, 2019 | 6:41 AM

The Los Angeles County Department of Public Works dirt hauling from the Devil’s Gate Sediment Removal site on the boundary between Pasadena and La Canada Flintridge halted last week due the fire weather is set to resume Monday.

Operations were shut down last week out of fire safety concerns after the National Weather Service issued Red Flag Warnings alerting the community to a heightened fire hazard.

Hauling operations are part of the Devil’s Gate Reservoir Restoration Project, a four-year effort to increase flood protection for communities downstream of Devil’s Gate Dam and restore habitat within a popular section of the Arroyo Seco watershed.

Under the project, Los Angeles County Public Works will remove 1.7 million cubic yards of sediment from the reservoir immediately behind the nearly 100-year-old dam. In addition to providing flood relief to communities that have endured nearly a decade of elevated flood risk along the Arroyo Seco, the project will establish a permanent stormwater maintenance area that allows for the creation of 70 acres of enhanced habitat and recreational opportunities for local communities.

Devil’s Gate Dam was built in the 1920s and got the name because of the rock formation’s resemblance to Satan. In the 1940s, the area became a ritual magnet, bringing in a group of occultists who were said to have attempted to evoke an antichrist from within.

The following decades brought reports of missing children in the area, and bouts of manic laughter coming from the tunnel.

Nowadays, Devil’s Gate Dam is a hotbed for adventurous hikers, paranormal activity investigators and has been featured on numerous TV shows about the world’s most haunted places.

Hauling operations started late last year and have been halted a number of times as the county’s Public Works Department made adjustments to the hauling procedures and the route, in response to complaints from communities near the dam about dust pollution and other issues.

Last month, hauling operations were suspended for about a month as the county developed a more comprehensive hauling plan, which now includes adding a second tire wash to the trucks leaving the reservoir.

Sediment from the reservoir is being hauled to Vulcan Materials Company’s Sheldon Pit in Sun Valley. County Public Works is coordinating with the South Coast Air Quality Management District to closely monitor the streets to ensure all dust issues are addressed in a timely manner.

To learn more about the Devil’s Gate Reservoir Restoration Project, visit

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