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Van Norden Dam Public Meeting 7-29-13

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Presentation given by David Shaw, Brian Hastings, Ted Beedy, and Barry Anderson at the Van Norden Dam Public Meeting. This presentation covers the different potential alternatives for the out of compliance Van Norden Dam.

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Van Norden Dam Public Meeting 7-29-13

  1. 1. Lake Van Norden Dam Truckee Donner Land Trust Public Meeting David Shaw, Brian Hastings, Ted Beedy, Barry Anderson July 29, 2013 photo
  2. 2. Acknowledgements • Chuck Kull, Holdrege and Kull • Randy Westmoreland, USFS • Gateway Mountain Center • Norm Sayler • Susan Lindstrom, PhD • UC Davis Center for Watershed Science • Aspet Ordoubigian, DSOD • George Lamson
  3. 3. Overview • Planning and regulatory framework • Approach • Sierra meadows overview • Historical context • Summary of preliminary findings – Channel and meadow conditions – Plants – Wildlife – Bathymetry • Description of alternatives • Next steps
  4. 4. Regulatory Framework 1. < 50 acre feet -OR- 2. < 6 feet high
  5. 5. Regulatory Framework Plants USFS Manual 7500: Dam Planning, Investigation and Design • Alternative 1: Full Breach • Alternative 2: “Non-jurisdictional” dam with determination of hazard
  6. 6. Regulatory Framework Plants USFS Manual 7500: Dam Planning, Investigation and Design • Alternative 3 (?): Existing dam with acceptable level of risk with dam failure
  7. 7. Investigation Approach Goal: Document existing conditions so that impacts associated with various alternatives can be evaluated and monitored
  8. 8. Investigation Approach Study Elements: • Historical and Cultural Resources Assessment • Channel and Meadow Assessment • Biological Resources Assessment • Bathymetric Survey Next steps: • Complete Channel and Meadow Assessment • Hydrology and Hydraulics Hazards • Monitor surface-groundwater interactions • Evaluation of Alternatives
  9. 9. Sierra Meadows Overview HydroGeomorphic Meadow Types (after Weixelman and others 2011) • Peatland • Depressional • Lacustrine • Dry • Discharge Slope • Riparian • Subsurface HydroGeomorphic Wetland Types (after USACE 1993, NRCS, 2008) • Depressional • Slope • Mineral Soil Flats • Organic Soil Flats • Riverine • Lacustrine Fringe
  10. 10. Historical and Culture Events Lake Van Norden and Meadow Date Event 9,000 yrs ago to historic contact Prehistory and Washoe/Maidu history 1844-1852 Emigrant Trail 1864 Dutch Flat Donner Lake Wagon Road 1868-69 Transcontinental Railroad 1870s-1880s Initial dam construction by S. Yuba Canal Co. ca. 1908 Dam construction by PG&E 1913-1925 Lincoln Highway 1921-1927 Victory Highway 1956-present Old County Road late 1970s Draw-down of Lake Van Norden 2012 Land acquired by Truckee Donner Land Trust 2013 Lake Van Norden and Meadow Assessment
  11. 11. Van Norden Meadow
  12. 12. HGM Map (UCD)
  13. 13. Van Norden Meadow Review of Historical Aerial Photography: 6-11-2011 8-21-2005 8-7-1992 9-6-1983 8-31-1977 7-24-1973 8-2-1972 7-15-1966 6-27-1939 Review of Historical Maps: GLO 1866 County Maps 1887, 1890, 1913 USGS 1889, 1940, 1955 (photo revised 1979) TNF 1911
  14. 14. Channel Conditions Van Norden Watershed and Meadow Watershed Area: 10.4 sq. mi. Headwaters of: • South Fork Yuba River Tributaries: • Upper Castle Creek • “Lytton Creek” Geology: • Cretaceous crystalline rocks • Tertiary extrusive volcanics • Glaciated Current Land Uses: Interstate I-80, Ski Areas, UPRR
  15. 15. Channel Conditions Upper Castle Creek
  16. 16. Channel Conditions South Fork Yuba River
  17. 17. Habitat Lake Van Norden and Meadow
  18. 18. Special Status Species: Bog and Fen species, Botrychium and Sphagnum Vegetation Van Norden Meadow
  19. 19. Bird Species Present Lake Van Norden and Meadow
  20. 20. Bird Species Present Lake Van Norden and Meadow
  21. 21. Bird Species Present Lake Van Norden and Meadow
  22. 22. Bird Species Present Lake Van Norden and Meadow
  23. 23. Bird Species Present Lake Van Norden and Meadow
  24. 24. Bird Species Present Lake Van Norden and Meadow
  25. 25. Bird Species Present Lake Van Norden and Meadow
  26. 26. Bird Species Present Lake Van Norden and Meadow
  27. 27. Other Wildlife Invertebrates, Reptiles, Amphibians, Mammals
  28. 28. Bathymetry Existing Conditions 50 acre-foot lake map Storage volume = 190 ac-ft Surface area = 86.7 ac
  29. 29. Bathymetry 50 ac-ft Lake Volume Footprint 4-foot notch lake map Req’d notch depth = 2.2 feet Surface area = 30.8 acres
  30. 30. Bathymetry 4-ft Notched Lake Volume Footprint 4-foot notch lake map Storage volume = 13.2 ac-ft Surface area = 11.8 ac
  31. 31. Evaluation of alternatives
  32. 32. Evaluation of alternatives Aerial photography evaluation and interpretation 1966
  33. 33. Evaluation of alternatives Aerial photography evaluation and interpretation 1977
  34. 34. Evaluation of alternatives Aerial photography evaluation and interpretation 2011
  35. 35. Discussion

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