| Report Year: 2009 |
| Little River Watershed Lake, Decatur County |
| Summary Data Table |
| Parameter | 6/18/2009 | 7/22/2009 | 2009 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000 |
| Lake Depth (m) | 9.7 | 9.8 | 9.8 | - | - | 10.3 | 10.6 | 10.4 | 10.7 | 11.1 | 10.2 |
| Thermocline Depth (m) | 7.7 | 8.0 | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A |
| Secchi Disk Depth (m) | 0.4 | 0.8 | 0.6 | - | - | 1.0 | 0.8 | 1.2 | 1.2 | 1.2 | 1.1 |
| Temperature(oC) | 21.3 | 23.2 | 22.2 | - | - | 25.1 | 23.3 | 25.2 | 26.0 | 22.6 | 24.0 |
| Dissolved Oxygen (mg/L) | 8.2 | 8.2 | 8.2 | - | - | 9.2 | 8.0 | 9.8 | 8.2 | 7.3 | 4.3 |
| Dissolved Oxygen Saturation (%) | 93 | 96 | 94.5 | - | - | 112.2 | 93.9 | 118.7 | 101.3 | 82.5 | 51.4 |
| Specific Conductivity (μS/cm) | 230.0 | 230.0 | 230.0 | - | - | 244.6 | 258.5 | 253.4 | 400.4 | 215.9 | 255.2 |
| Turbidity (NTU) | 32.4 | 13.1 | 22.8 | - | - | 19.9 | 23.8 | 15.0 | 12.1 | 17.9 | 14.9 |
| Chlorophyll a (μg/L) | 3.0 | 10.0 | 6.5 | - | - | 101.3 | 50.3 | 24.9 | 19.3 | 19.5 | 3.5 |
| Total Phosphorus as P (μg/L) | 102 | 47 | 74 | - | - | 46 | 139 | 42 | 35 | 57 | 134 |
| SRP as P (μg/L) | 29 | - | 29 | - | - | 1 | 54 | 2 | 1 | - | - |
| Total Nitrogen as N (mg/L) | 1.71 | 1.13 | 1.42 | - | - | 1.10 | 2.35 | 0.94 | 1.02 | 1.43 | 1.72 |
| (Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L) | 16 | 16 | 16 | - | - | 102 | 228 | - | - | - | - |
| (Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L) | 0.7 | 3.4 | 2.0 | - | - | 4.9 | 6.2 | - | - | - | - |
| Nitrate + Nitrite (NO3 + NO2) as N (mg/L) | 1.13 | 0.15 | 0.64 | - | - | 0.20 | 1.19 | 0.15 | 0.28 | 0.50 | 0.19 |
| TN:TP ratio | 17 | 24 | 20 | - | - | 24 | 21 | 23 | 31 | 39 | 15 |
| pH | 8.0 | 8.9 | 8.4 | - | - | 8.2 | 8.0 | 8.4 | 8.3 | 8.0 | 7.1 |
| Alkalinity as CaCO3 (mg/L) | 92 | 91 | 92 | - | - | 105 | 87 | 74 | 102 | 90 | 149 |
| Silica as Si (mg/L) | - | - | - | - | - | 2.46 | 7.69 | 2.04 | 1.09 | - | - |
| Dissolved Organic Carbon (mg/L) | 5.49 | 5.83 | 5.66 | - | - | 5.04 | 6.74 | 9.67 | 10.36 | - | - |
| Inorganic Suspended Solids (mg/L) | 15 | 11 | 13 | - | - | 8 | 6 | 3 | 4 | 5 | 6 |
| Volatile Suspended Solids (mg/L) | 4 | 2 | 3 | - | - | 8 | 7 | 6 | 5 | 4 | 3 |
| Total Suspended Solids (mg/L) | 19 | 12 | 16 | - | - | 16 | 13 | 9 | 9 | 10 | 9 |
| Carlson Trophic State Index (Secchi)* | 73 | 64 | 68 | - | - | 61 | 63 | 58 | 57 | 57 | 58 |
| Carlson Trophic State Index (Chl a)* | 41 | 53 | 49 | - | - | 76 | 69 | 62 | 60 | 60 | 43 |
| Carlson Trophic State Index (TP)* | 71 | 60 | 66 | - | - | 59 | 75 | 58 | 55 | 62 | 75 |
| *Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions. |