Sierra College to host forum on sediment, mercury from creeks to reservoirs |

Sierra College to host forum on sediment, mercury from creeks to reservoirs

Know & Go

What: Free science presentation on sediment, mercury from creeks to reservoirs

When: 6:30-7:30 p.m. May 8

Where: Sierra College Nevada County Campus, Multipurpose Center Building N-12

Info: The Nevada County Campus is located at 250 Sierra College Drive. Parking is $3, and you can purchase permits at the kiosk machine at the main entrance to the campus. For more information, contact Jason Giuliani at

Find out about mercury in Sierra watersheds, a legacy of the California Gold Rush, during which time more than 10 million pounds were applied at mining operations to aid in gold recovery.

Of this mercury, 10 to 30 percent was lost to the environment, posing a threat to the environment and public health today.

The storm runoff from the Malakoff Diggins hydraulic mine discharges into nearby creeks, contributing significant loads of sediment and mercury as it flows into the Wild and Scenic South Yuba River. Mercury-contaminated sediment accumulates in reservoirs, and the Nevada Irrigation District’s project to remove this material from Combie Reservoir on the Bear River is an innovative approach to addressing legacy contamination.

Dr. Carrie Monohan will discuss how our state can address mercury left over from the Gold Rush, and will explore strategies and the multiple benefits associated with removing contaminated sediment to restore reservoirs across the Sierra Nevada.

Carrie Monohan, Ph.D., is the science director at The Sierra Fund. She executes the fund’s Ecosystem Resiliency Program, which addresses ongoing mining impacts on water quality, forest health, meadows and fish passage. For over 10 years, Dr. Monohan has researched the effects of the Gold Rush in the Sierra Nevada.

Her assessment techniques and efforts to prioritize mine-scarred lands have helped shape statewide efforts to reduce mercury discharge from California’s headwaters.

For more information, contact series coordinator Jason Giuliani, at

Source: Sierra College

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