1. MILLTOWN SUPERFUND SITE MISSOULA COUNTY, MT Geol 361 - Michael Armstrong & Heather Pung

3. History of Milltown Dam  Built between 1905 and 1908  Supplied power  Major flood of 1908 www.meic.org/.../stimson-hist-pic.jpg/view www.meic.org/.../image_view_fullscreen

4. Superfund Site -Definition of a Superfund Site -Environmental Protection Agency (EPA) roles in a Superfund site www.nytimes.com/2008/05/27/science/27dam.html

5. Pollution Problems  Leeching of arsenic  Polluted drinking water  Copper in sediments http://mt.water.usgs.gov/projects/clarkfork/images/Milltown%20Dam.jpgwww.flickr.com/.../lucidaphotographic/251151519

6. Objective for Milltown Restoration  restore the river channels at the confluence to be naturally functioning and self-maintaining  maintain water quality  provide high quality habitat for fish and wildlife  improve aesthetic values in the area by creating a diverse, natural setting  provide functional wetland and riparian communities  provide safe recreational opportunities such as river boating, fishing and trail access for hiking and bicycling (EPA website)

7. The Process  Remove sediments  Remove the dam and powerhouse  Restore the Milltown drinking water supply  Allow unrestricted fish passage  Return the Clark Fork and Blackfoot Rivers to a more natural flow. http://farm3.static.flickr.com/2586/3691968042_d6815c9125.jpg

8. http://www.cfwep.org/education/5-8/blackfootfishid/milltown_aerial.jpg

9. How is this being done? http://www.nytimes.com/imagepages/2008/05/27/science/27dam.graphic.ready.ht ml

10. Dam Removal Process http://www.epa.gov/region8/superfund/mt/milltown/cfrdiversionphotos.html 1 2 3 4

11. Dam Removal Process Continued http://www.epa.gov/region8/superfund/mt/milltown/cfrdiversionphotos.html 5 6

12. 3Rs: Remediation, Restoration, and Redevelopment http://epa.gov/region8/superfund/mt/milltown/MilltownPark.pdf Remediation: Dam and sediment removal Restoration: Returning natural functions of the rivers Redevelopment: New development to benefit the surrounding communities

13. Lessons Learned  Mining contamination  Effects of groundwater contamination  Dam affects on rivers  Process of superfund projects  PREVENTION  Sediment contamination  Polluted aquifers, rivers and streams

14. Sources  Hammer, Diana. "Breaching the Milltown Dam." US EPA. 31 Mar 2008. EPA, Web. 8 Nov 2009..Matth ews, Mark. "Environmentalists Want a Small Montana Dam Removed." CNR. 245.1 (2000): Print.  Robbins, Jim. "Montana Dam is Breached, Slowly, to Restore a Superfund Site." New York Times 27 May 2008: F.3. Print.  Tuthill, A.M. "Effects of proposed dam removal on ice jamming and bridge scour on the Clark Fork River, Montana." Cold Regions Science and Technology. 55. (2009): 186-194. Print.