| Report Year: 2009 |
| Nine Eagles Lake, Decatur County |
| Summary Data Table |
| Parameter | 6/17/2009 | 7/22/2009 | 2009 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000 |
| Lake Depth (m) | 9.6 | 10.0 | 9.8 | 9.2 | 9.4 | 9.5 | 10.0 | 10.1 | 9.5 | 8.9 | 9.1 |
| Thermocline Depth (m) | 2.6 | 2.9 | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A |
| Secchi Disk Depth (m) | 1.4 | 2.0 | 1.7 | 2.8 | 3.6 | 2.9 | 2.0 | 2.1 | 1.7 | 1.5 | 1.3 |
| Temperature(oC) | 23.5 | 23.6 | 23.5 | 25.2 | 24.5 | 24.6 | 25.3 | 25.1 | 26.3 | 25.0 | 24.8 |
| Dissolved Oxygen (mg/L) | 7.6 | 8.0 | 7.8 | 8.2 | 7.9 | 8.7 | 7.4 | 7.5 | 8.2 | 7.9 | 7.7 |
| Dissolved Oxygen Saturation (%) | 89 | 95 | 92.0 | 98.7 | 94.4 | 103.6 | 90.2 | 90.6 | 101.0 | 94.3 | 92.7 |
| Specific Conductivity (μS/cm) | 200.0 | 210.0 | 205.0 | 193.4 | 193.4 | 187.9 | 206.6 | 214.9 | 398.8 | 218.7 | 229.2 |
| Turbidity (NTU) | 9.7 | 2.7 | 6.2 | 16.6 | 4.9 | 2.3 | 4.8 | 7.1 | 5.5 | 8.3 | 18.0 |
| Chlorophyll a (μg/L) | 8.0 | 2.0 | 5.0 | 7.2 | 3.9 | 1.6 | 4.4 | 2.2 | 3.3 | 7.0 | 5.7 |
| Total Phosphorus as P (μg/L) | 43 | 15 | 29 | 26 | 17 | 15 | 22 | 21 | 22 | 35 | 119 |
| SRP as P (μg/L) | - | - | - | 1 | - | 1 | 1 | 2 | 2 | - | - |
| Total Nitrogen as N (mg/L) | 0.57 | 0.51 | 0.54 | 0.59 | 0.55 | 0.54 | 0.61 | 0.60 | 0.93 | 0.64 | 0.80 |
| (Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L) | 45 | 16 | 29 | 16 | 16 | 50 | 22 | - | - | - | - |
| (Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L) | 3.4 | 1.4 | 2.4 | 1.1 | 0.2 | 3.4 | 1.4 | - | - | - | - |
| Nitrate + Nitrite (NO3 + NO2) as N (mg/L) | - | 0.12 | 0.12 | 0.12 | 0.12 | 0.12 | 0.12 | 0.13 | 0.42 | 0.22 | 0.21 |
| TN:TP ratio | 13 | 34 | 24 | 35 | 37 | 37 | 27 | 30 | 42 | 20 | 8 |
| pH | 8.2 | 8.4 | 8.3 | 8.2 | 7.9 | 8.3 | 8.1 | 8.0 | 8.0 | 7.8 | 7.6 |
| Alkalinity as CaCO3 (mg/L) | 98 | 102 | 100 | 134 | 90 | 90 | 98 | 69 | 102 | 104 | 157 |
| Silica as Si (mg/L) | - | - | - | - | - | 3.21 | 3.84 | 3.04 | 3.38 | - | - |
| Dissolved Organic Carbon (mg/L) | 6.67 | 6.23 | 6.45 | 7.99 | 6.24 | 7.39 | 5.70 | 9.65 | 11.08 | - | - |
| Inorganic Suspended Solids (mg/L) | 2 | 4 | 3 | 4 | 1 | 2 | 4 | 4 | 3 | 6 | 5 |
| Volatile Suspended Solids (mg/L) | 3 | - | 3 | 2 | 2 | 3 | 1 | 2 | 3 | 3 | 3 |
| Total Suspended Solids (mg/L) | 5 | 4 | 5 | 6 | 3 | 5 | 5 | 6 | 5 | 7 | 8 |
| Carlson Trophic State Index (Secchi)* | 55 | 50 | 52 | 45 | 42 | 45 | 50 | 49 | 53 | 54 | 57 |
| Carlson Trophic State Index (Chl a)* | 51 | 37 | 46 | 50 | 44 | 35 | 45 | 38 | 42 | 50 | 48 |
| Carlson Trophic State Index (TP)* | 58 | 43 | 53 | 51 | 45 | 43 | 49 | 48 | 49 | 56 | 73 |
| *Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions. |