The Creek and Its Watershed

Wolf Creek begins above Grass Valley, California, flows through the city, turns roughly south, and eventually joins the Bear River at Nevada County's southern border. The creek and its tributaries drain a significant portion of southwestern Nevada County. Wolf Creek has been neglected and under-appreciated in the past, but that has begun to change as Wolf Creek Community Alliance works to preserve and protect Wolf Creek and its watershed for the benefit of present and future generations.

View larger map

In the Current

COVID-19 Outbreak Notice. All planned group activities have been postponed until further notice. You may still take walks and explore the watershed. There are wildflowers and singing birds to enjoy along our trails. You may still access Wolf Creek and tributaries along the Wolf Creek Trail, Empire Mine State Historic Park, and other Bear Yuba Land Trust Trails.

2020 Wolf Creek monitoring calendar. The water-quality monitoring days for 2020 are listed here for your convenient reference, along with information about becoming a monitor.

Creek Disturbance Inventory. Extensively researched and highly informative report by Josie Crawford.

Heavy metals map. See where our testing has revealed amounts of mercury, cadmium, lead, or arsenic that are over the recommended human exposure thresholds.

Support Wolf Creek Alliance at no cost! Every time you shop at SPD, 3% of your purchase amount can go to WCCA without any money coming out of your own pocket. FIND OUT HOW

We need your support! On the Support Our Work page, you can donate to WCCA quickly and easily using PayPal or a credit card, and you can learn about other ways of supporting our work.

iNaturalist observations. View observations from Wolf Creek naturalists on


Program Areas

  • Water quality monitoring
  • Ecological assessments
  • Ecological restoration
  • Stewardship

  • Creek-friendly landscaping
  • Watershed awareness
  • Creek-friendly development
  • Idaho-Maryland Mine project
  • Wolf Creek Parkway advocacy
  • Trails planning
  • Trail network connectivity