Thursday, March 13, 2014, 4:30PM - 5:30PM
ARC room 248
In 2009, a bulkhead was installed in Dinero tunnel, near Leadville, Colorado, to reduce drainage and improve water quality and aquatic habitat downstream in Lake Fork Creek.
Monitoring during 2006 and 2010 to 2012 indicated water-quality improvement in Lake Fork Creek (zinc concentrations and loads decreased). However, water quality degraded in areas adjacent to Dinero tunnel, possibly due to increased water-table elevation behind the bulkhead. Additionally, the chemical composition and source of water at the mouth of the tunnel changed due to bulkhead installation. Water-quality changes in Dinero Tunnel, Lake Fork Creek and adjacent areas due to bulkhead emplacement will be discussed.
Abstract adapted from Walton-Day and Mills (in press) and Walton-Day et al., 2013