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Lakes of Missouri Volunteer Program

University of Missouri-Columbia. Missouri’s Lakes and Reservoirs. Lakes of Missouri Volunteer Program. Tony Thorpe Dan Obrecht Jack Jones. The. The Missouri Department of Natural Resources.

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Lakes of Missouri Volunteer Program

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  1. University of Missouri-Columbia Missouri’s Lakes and Reservoirs Lakes of Missouri Volunteer Program Tony Thorpe Dan Obrecht Jack Jones The The Missouri Department of Natural Resources Region V11, US Environmental Protection Agency, through the Missouri Department of Natural Resources, has provided partial funding for this project under Section 319 of the Clean Water Act

  2. 405 Classified Lakes/Reservoirs • ~108 are Drinking Water Supply (LC1) • 14 are Major Reservoirs (LC2) Most are man-made reservoirs, with about 15 - 20 oxbow lakes.

  3. Of the 405 Classified Waterbodies, we have at least 4 years worth of data on 134 What follows is a summary of the physical features of those 134 waterbodies “A central paradigm of modern limnology is that external nutrient loading, modified by morphology and hydrology, determines the trophic state of a lake.” Jones et al. 2005

  4. Lake Morphology • Surface Area • Depth • Volume Lake Hydrology • Watershed Area • Residence Time External Loading • Land Use

  5. Surface Area Ranges from 6 to 53,814 acres in size, with a median of 103 acres.

  6. Break down by size 30% of classified lakes are 20 acres or less in size. 10% are greater than 300 acres in size.

  7. Average Depth Ranges from 3.7 feet to 62 feet, with a median of 11.6 feet.

  8. Lake Volume Ranges from 48 to 2,700,000 acre-feet, with a median of 1,675 acre-feet. 1 acre 1 foot 1 acre-foot = 325,851 gallons

  9. Lake Hydrology

  10. Watershed Area Ranges from 83 to > 4,000,000 acres, with a median of 2,516 acres.

  11. Residence Time Ranges from 2.6 days to 9 years, with a median of 10.5 months.

  12. External Loading

  13. Land Cover within watersheds Forest = 0 – 95% Grass = 0 – 78% Crop = 0 – 74% Urban = 0 – 96% Using the 134 classified lakes for which we have >= 4 years worth of data

  14. Land Cover and Water Quality:Row Crop Data points based on summertime averages near the dam

  15. Land Cover and Water Quality:Forest Data points based on summertime averages near the dam

  16. Trophic Classification OligoMesoEutroHyper TP 10 36 81 7 TN 11 22 92 9 CHL a 15 23 92 4

  17. Distributions based on long-term averages

  18. Phosphorus(micrograms per liter) IX – 20 ug/L XI – 8 ug/L (EPA recommendations as of July 2002) # of waterbodies

  19. Nitrogen(micrograms per liter) IX – 360 ug/L XI – 460 ug/L (EPA recommendations as of July 2002) # of waterbodies

  20. Chlorophyll(micrograms per liter) IX – 4.9 ug/L XI – 2.8 ug/L (EPA recommendations as of July 2002) # of waterbodies

  21. “Small” Reservoirs: less than 2000 acres Break down by size “Large” Reservoirs: more than 2000 acres

  22. “Large” Reservoirs 2004 LMVP Data

  23. “Small” Reservoirs Inset is to scale 2004 LMVP Data

  24. Types of Variability • Temporal • Spatial

  25. Temporal Variability

  26. Little Dixie Lake – Seasonal Patterns Phosphorus (ug/L) 2004 LMVP Data

  27. Little Dixie Lake – Seasonal Patterns Phosphorus (ug/L)

  28. Range = 37 – 95 ug/L

  29. Spatial Variability

  30. Phosphorus Concentrations: Lake of the Ozarks Variability within a lake 2002 LMVP Data

  31. Phosphorus Concentrations: Table Rock Lake Variability within a lake 2002 LMVP Data

  32. Phosphorus Concentrations: Longview Lake 25 930 acres Approximately 1 mile between the two sites. 27 Variability within a lake

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