| Report Year: 2009 |
| Don Williams Lake, Boone County |
| Summary Data Table |
| Parameter | 6/11/2009 | 7/13/2009 | 2009 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000 |
| Lake Depth (m) | 11.1 | 11.0 | 11.1 | 12.1 | 12.3 | 12.2 | 12.7 | 12.6 | 13.0 | 12.3 | 12.1 |
| Thermocline Depth (m) | 2.4 | 2.0 | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A |
| Secchi Disk Depth (m) | 1.0 | 1.1 | 1.1 | 0.9 | 2.3 | 3.1 | 1.1 | 1.5 | 2.5 | 2.2 | 0.6 |
| Temperature(oC) | 19.6 | 22.8 | 21.2 | 24.0 | 23.0 | 23.5 | 20.5 | 22.4 | 24.3 | 21.5 | 26.2 |
| Dissolved Oxygen (mg/L) | 8.2 | 9.5 | 8.8 | 12.1 | 10.0 | 7.9 | 11.6 | 12.9 | 8.6 | 11.4 | 11.2 |
| Dissolved Oxygen Saturation (%) | 89 | 110 | 99.8 | 143.4 | 116.5 | 94.0 | 130.9 | 140.4 | 102.2 | 144.8 | 138.8 |
| Specific Conductivity (μS/cm) | 530.0 | 610.0 | 570.0 | 516.8 | 626.1 | 622.4 | 546.4 | 615.2 | 527.8 | 507.7 | 374.3 |
| Turbidity (NTU) | 3.4 | 5.0 | 4.2 | 19.5 | 6.4 | 23.8 | 12.9 | 14.1 | 4.9 | 8.6 | 11.1 |
| Chlorophyll a (μg/L) | 24.0 | 22.0 | 23.0 | 20.5 | 23.2 | 22.8 | 17.8 | 25.2 | 11.9 | 12.7 | 35.0 |
| Total Phosphorus as P (μg/L) | 63 | 41 | 52 | 97 | 29 | 33 | 126 | 50 | 50 | 129 | 87 |
| SRP as P (μg/L) | - | - | - | 139 | 1 | 3 | 42 | 1 | 18 | - | - |
| Total Nitrogen as N (mg/L) | 9.13 | 8.20 | 8.67 | 9.57 | 10.81 | 7.66 | 11.44 | 13.38 | 11.40 | 16.75 | 3.46 |
| (Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L) | - | 19 | 19 | 65 | 16 | 108 | 51 | - | - | - | - |
| (Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L) | - | 1.7 | 1.7 | 5.5 | 0.5 | 9.8 | 4.2 | - | - | - | - |
| Nitrate + Nitrite (NO3 + NO2) as N (mg/L) | 8.06 | 7.67 | 7.87 | 9.10 | 10.21 | 6.92 | 11.14 | 12.26 | 10.03 | 14.53 | 2.20 |
| TN:TP ratio | 144 | 200 | 172 | 139 | 438 | 274 | 143 | 313 | 333 | 174 | 47 |
| pH | 8.5 | 8.3 | 8.4 | 8.3 | 8.4 | 8.3 | 8.4 | 8.3 | 8.3 | 8.3 | 7.9 |
| Alkalinity as CaCO3 (mg/L) | 228 | 252 | 240 | 188 | 211 | 217 | 179 | 142 | 164 | 153 | 148 |
| Silica as Si (mg/L) | - | - | - | - | - | 5.88 | 8.89 | 4.72 | 4.87 | - | - |
| Dissolved Organic Carbon (mg/L) | 3.62 | 2.79 | <3.6 | 4.00 | 3.87 | <3.6 | 3.96 | 6.80 | 6.57 | - | - |
| Inorganic Suspended Solids (mg/L) | 5 | 5 | 5 | 10 | 7 | 3 | 7 | 8 | 4 | 7 | 5 |
| Volatile Suspended Solids (mg/L) | 7 | 5 | 6 | 7 | 7 | 4 | 3 | 5 | 8 | 4 | 5 |
| Total Suspended Solids (mg/L) | 13 | 10 | 12 | 16 | 14 | 7 | 10 | 13 | 9 | 12 | 10 |
| Carlson Trophic State Index (Secchi)* | 60 | 59 | 59 | 61 | 48 | 44 | 59 | 55 | 47 | 49 | 67 |
| Carlson Trophic State Index (Chl a)* | 62 | 61 | 61 | 60 | 61 | 61 | 59 | 62 | 55 | 56 | 65 |
| Carlson Trophic State Index (TP)* | 64 | 58 | 61 | 70 | 53 | 54 | 74 | 61 | 61 | 74 | 69 |
| *Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions. |