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What’s changed and what hasn’t

What’s changed and what hasn’t. Pat Oldenburg Water Resources Engineer Wisconsin Dept. Natural Resources. Phosphorus Criteria Refresher. Contained in s. NR 102.06 WI Admin. Code Rivers and Streams Named rivers – 100 m g/L Wisconsin River downstream of Rhinelander

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What’s changed and what hasn’t

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  1. What’s changed and what hasn’t Pat Oldenburg Water Resources Engineer Wisconsin Dept. Natural Resources

  2. Phosphorus Criteria Refresher • Contained in s. NR 102.06 WI Admin. Code • Rivers and Streams • Named rivers – 100 mg/L • Wisconsin River downstream of Rhinelander • Lemonweir River downstream of New Lisbon • Baraboo River downstream of La Valle • Other rivers in this study - 75 mg/L • Lakes and Reservoirs • Natural lakes – 15 to 40 mg/L (none in this study) • Reservoirs • Stratified Reservoirs - 30 mg/L • Big Eau Pleine • Mixed Reservoirs - 40 mg/L • Lake Dubay, Petenwell, and Castle Rock

  3. Wisconsin River Tributaries:May-Oct Medians (2009-2012)

  4. Wisconsin River Tributaries:Preliminary Loads

  5. Wisconsin River Tributaries:Preliminary Loads

  6. Wisconsin River Tributaries:Preliminary Loads: Big Eau Pleine

  7. Wisconsin River Mainstem:May-Oct Medians(2009-2012)

  8. Wisconsin River Mainstem:Preliminary Loads

  9. Wisconsin River Mainstem:Preliminary Loads

  10. Wisconsin River Mainstem:Preliminary Loads: Nekoosa

  11. Longer Term Comparisons SWTP DFA NCHF NLF NLF NCHF No trend SWTP DFA 1977-2010

  12. Longer Term Comparisons

  13. Big Eau Pleine Reservoir Data

  14. Lake Dubay Data

  15. Petenwell Lake Data

  16. Castle Rock Lake Data

  17. Lake Wisconsin Lake Data

  18. Conclusions • Wisconsin River phosphorus concentrations generally increase north to south • Big Eau Pleine, Petenwell and Castle Rock appear to act as net sinks for phosphorus • Lake Dubay and Lake Wisconsin less clear • Western tributaries exhibit much higher phosphorus concentrations and unit area loads than eastern tributaries • Flowages generally exhibit poor water quality (Chlorophyll > 25 µg/L) • Algae blooms are variable and heterogeneous

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