1. Water Quality in the Caddo Lake Watershed Caddo Lake Water Quality Cypress Creek Clean Rivers Program

3. Monitoring Station Types Routine monitoring is used to follow trends and to identify water quality changes in the major watersheds. Systematic monitoring is a screening tool used to detect potential concerns. Typically placed on the smaller streams. Biological monitoring is a key factor. Special study monitoring projects are located and designed to address a specific concern.

5. Water Quality Parameter Sets Field –Temperature –Dissolved Oxygen –Conductivity –pH –Secchi Depth Diel Sampling Conventional –Suspended Solids –Dissolved Solids Chloride Sulfate Hardness Alkalinity –Nutrients –Ammonia, Nitrate & Organic Nitrogen, Phosphorus –Chlorophyll –Bacteria

6. Other Sample Sets Metals in Water and in Sediment –aluminum, arsenic, chromium, copper, nickel, silver, zinc, barium, molybdenum, selenium, iron, and manganese Habitat & Biological –Fish & Macroinvertebrates (Benthics)

10. Average Annual Inflow to Caddo Lake During 1979 – 2004

13. Black Cypress Bayou Station 10245 pH Dissolved Oxygen (mg/l) Average 6.4 Average 7.0 Median 6.4 Median 6.6 Range 5.3-8.6 (71) Range 2.3-11.8 (72) Chlorophyll a g/l) Average 7.65Median 5.00 Range 0.20-58.00 (65)

15. DO 24HR Min DO 24HR MaxDO Range DO 24HR Average Station 10245 07/18/20003.33.70.43.5 08/24/20000.42.21.81.1 11/21/200010.210.50.310.3 04/06/20017.16.2-0.96.7 05/04/20016.35.9-0.46 06/08/20015.45.50.15 07/03/20015.65.80.25.7 08/08/20012.13.41.33.1 09/11/20015.75.80.15.7 10/19/20017.77.90.27.8 04/13/20056.56.70.26.6 05/06/20057.47.80.47.6 Average0.35.8

16. Nitrogen (mg/l) Station 10245 Nitrate + Nitrite Nitrate Average 0.110.13 Median 0.100.08 Range 0.04-0.28 (26)0.02-0.79 (38) Ammonia TKN Average 0.080.58 Median 0.050.54 Range 0.0-0.277 (65) 0.03-1.27 (34)

17. Total Phosphorus (mg/l) Station 1024510246 Average 0.08 0.10 Median 0.08 0.08 Range 0.01-0.26 (66) 0.03-0.20 (25)

25. Little Cypress Bayou Station 10332 pH Dissolved Oxygen (mg/l) Average 6.6 7.0 Median 6.6 6.9 Range 5.2-8.6 (157) 2.3-13.7 (154) Chlorophyll a g/l) Average 6.66Median 5.00 Range 0.20-58.00 (65)

27. DO 24HR Min DO 24HR MaxDO Range DO 24HR Average Station 10332 4/2/026.87.30.57 5/3/024.44.70.34.5 6/4/0255.40.45.2 7/2/024.44.80.44.6 8/1/023.94.50.64.2 9/4/024.85.40.65 6/3/034.34.50.24.4 6/24/034.95.20.35 7/25/032.83.50.73.1 8/13/034.65.71.15 Average0.54.8

28. Nitrogen (mg/l) Station 10332 Nitrate + Nitrite Nitrate Average 0.140.09 Median 0.100.07 Range 0.05-0.40 (68)0.02-0.26 (22) Ammonia TKN Average 0.080.76 Median 0.050.70 Range 0.01-0.90 (122) 0.20-2.90 (109)

29. Total Phosphorus (mg/l) Station 1033215773 Average 0.11 0.21 Median 0.09 0.14 Range 0.01-1.10 (122) 0.01-1.34 (20)