| Report Year: 2009 |
| Brushy Creek Lake, Webster County |
| Summary Data Table |
| Parameter | 6/4/2009 | 7/8/2009 | 2009 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000 |
| Lake Depth (m) | 16.8 | 19.8 | 18.3 | 19.7 | 21.0 | 20.5 | 21.6 | 21.5 | 20.3 | 20.8 | 21.7 |
| Thermocline Depth (m) | 7.5 | 2.5 | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A |
| Secchi Disk Depth (m) | 6.1 | 1.2 | 3.6 | 1.2 | 2.3 | 1.9 | 1.6 | 2.5 | 2.5 | 1.3 | 2.7 |
| Temperature(oC) | 17.8 | 24.4 | 21.1 | 21.5 | 23.2 | 22.6 | 21.0 | 18.9 | 23.6 | 19.8 | 24.0 |
| Dissolved Oxygen (mg/L) | 10.1 | 18.3 | 14.2 | 12.7 | 12.6 | 11.2 | 11.6 | 13.0 | 10.8 | 10.4 | 11.1 |
| Dissolved Oxygen Saturation (%) | 106 | 219 | 162.5 | 143.8 | 147.2 | 126.2 | 130.7 | 139.8 | 126.2 | 106.6 | 131.1 |
| Specific Conductivity (μS/cm) | 570.0 | 500.0 | 535.0 | 577.9 | 591.0 | 516.9 | 526.5 | 648.4 | 570.3 | 511.7 | 478.6 |
| Turbidity (NTU) | 1.3 | 10.3 | 5.8 | 7.7 | 8.2 | 10.4 | 8.7 | 15.5 | 2.1 | 11.0 | 11.9 |
| Chlorophyll a (μg/L) | 4.0 | 28.0 | 16.0 | 28.5 | 44.9 | 51.3 | 36.2 | 16.1 | 10.0 | 16.9 | 3.4 |
| Total Phosphorus as P (μg/L) | 119 | 54 | 86 | 47 | 23 | 46 | 64 | 58 | 23 | 120 | 44 |
| SRP as P (μg/L) | 68 | 1 | 34 | 1 | - | 1 | 1 | 17 | 1 | - | - |
| Total Nitrogen as N (mg/L) | 5.62 | 7.44 | 6.53 | 14.06 | 12.11 | 10.19 | 11.32 | 15.01 | 11.74 | 16.29 | 7.07 |
| (Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L) | 17 | 16 | 16 | 17 | 16 | 40 | 16 | - | - | - | - |
| (Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L) | 2.4 | 0.3 | 1.4 | 2.2 | 2.0 | 5.1 | 1.5 | - | - | - | - |
| Nitrate + Nitrite (NO3 + NO2) as N (mg/L) | 5.91 | 6.33 | 6.12 | 14.02 | 11.51 | 8.98 | 10.69 | 13.95 | 10.56 | 15.30 | 6.39 |
| TN:TP ratio | 47 | 139 | 93 | 310 | 556 | 297 | 179 | 304 | 526 | 229 | 676 |
| pH | 8.7 | 8.9 | 8.8 | 8.5 | 8.4 | 8.4 | 8.6 | 8.4 | 8.4 | 8.4 | 7.7 |
| Alkalinity as CaCO3 (mg/L) | 260 | 182 | 221 | 174 | 179 | 170 | 171 | 125 | 172 | 152 | 177 |
| Silica as Si (mg/L) | - | - | - | - | - | 3.87 | 6.76 | 4.56 | 2.89 | - | - |
| Dissolved Organic Carbon (mg/L) | 4.81 | 4.12 | 4.47 | 20.34 | 4.43 | 5.55 | 15.78 | 7.15 | 7.55 | - | - |
| Inorganic Suspended Solids (mg/L) | 4 | 2 | 3 | 3 | 4 | 3 | 2 | 6 | 2 | 3 | 2 |
| Volatile Suspended Solids (mg/L) | 2 | 9 | 6 | 4 | 4 | 7 | 5 | 3 | 4 | 5 | 2 |
| Total Suspended Solids (mg/L) | 6 | 12 | 9 | 7 | 7 | 10 | 7 | 9 | 6 | 7 | 3 |
| Carlson Trophic State Index (Secchi)* | 34 | 58 | 41 | 57 | 48 | 51 | 53 | 47 | 47 | 56 | 46 |
| Carlson Trophic State Index (Chl a)* | 44 | 63 | 58 | 63 | 68 | 69 | 66 | 58 | 53 | 58 | 43 |
| Carlson Trophic State Index (TP)* | 73 | 62 | 68 | 60 | 49 | 59 | 64 | 63 | 49 | 73 | 59 |
| *Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions. |