| Report Year: 2009 |
| Little Sioux Park Lake, Woodbury County |
| Summary Data Table |
| Parameter | 6/1/2009 | 7/6/2009 | 2009 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000 |
| Lake Depth (m) | 6.1 | 4.8 | 5.5 | 7.5 | 8.1 | 7.8 | 8.6 | 8.6 | 8.1 | 8.4 | 7.0 |
| Thermocline Depth (m) | 4.3 | 0.5 | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A |
| Secchi Disk Depth (m) | 5.5 | 4.8 | 5.1 | 2.9 | 4.2 | 3.9 | 3.9 | 4.3 | 2.9 | 3.6 | 3.7 |
| Temperature(oC) | 22.0 | 27.8 | 24.9 | 25.5 | 24.2 | 25.2 | 23.2 | 23.3 | 25.7 | 23.2 | 26.2 |
| Dissolved Oxygen (mg/L) | 12.6 | 8.4 | 10.5 | 9.6 | 11.9 | 10.9 | 9.7 | 10.2 | 9.6 | 10.1 | 8.9 |
| Dissolved Oxygen Saturation (%) | 144 | 107 | 125.4 | 116.9 | 141.9 | 131.4 | 113.7 | 120.1 | 117.8 | 117.6 | 109.7 |
| Specific Conductivity (μS/cm) | 340.0 | 330.0 | 335.0 | 317.5 | 299.4 | 313.3 | 368.7 | 360.0 | 476.6 | 465.6 | 353.5 |
| Turbidity (NTU) | 0.7 | 1.0 | 0.9 | 1.8 | 2.6 | 4.7 | 2.1 | 2.0 | 2.4 | 3.4 | 0.8 |
| Chlorophyll a (μg/L) | 4.0 | 1 | 2.5 | 4.6 | 4.1 | 5.4 | 3.3 | 2.9 | 30.4 | 1.7 | 4.8 |
| Total Phosphorus as P (μg/L) | 14 | 9 | 11 | 18 | 15 | 17 | 18 | 17 | 28 | 25 | 154 |
| SRP as P (μg/L) | - | - | - | 1 | - | - | 1 | 1 | 1 | - | - |
| Total Nitrogen as N (mg/L) | 0.60 | 0.62 | 0.61 | 0.58 | 0.67 | 0.72 | 0.57 | 0.64 | 0.74 | 0.82 | 0.73 |
| (Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L) | 16 | 16 | 16 | 16 | 16 | 53 | 22 | - | - | - | - |
| (Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L) | 0.2 | 3.9 | 2.0 | 0.9 | 2.2 | 20.4 | 3.6 | - | - | - | - |
| Nitrate + Nitrite (NO3 + NO2) as N (mg/L) | 0.12 | 0.12 | 0.12 | 0.12 | 0.12 | 0.12 | 0.12 | 0.12 | 0.16 | 0.12 | 0.13 |
| TN:TP ratio | 43 | 125 | 84 | 33 | 49 | 43 | 33 | 39 | 31 | 59 | 21 |
| pH | 8.8 | 8.7 | 8.8 | 9.0 | 9.2 | 8.9 | 8.7 | 8.6 | 8.9 | 8.3 | 8.5 |
| Alkalinity as CaCO3 (mg/L) | 189 | 155 | 172 | 160 | 148 | 160 | 167 | 138 | 160 | 152 | 169 |
| Silica as Si (mg/L) | - | - | - | - | - | 1.53 | 1.29 | 0.98 | 2.27 | - | - |
| Dissolved Organic Carbon (mg/L) | 5.26 | 5.46 | 5.36 | 6.06 | 3.84 | 6.24 | 5.03 | 7.82 | 10.60 | - | - |
| Inorganic Suspended Solids (mg/L) | - | - | - | 2 | 1 | 2 | 2 | 4 | 3 | 2 | 1 |
| Volatile Suspended Solids (mg/L) | 6 | 1 | 3 | 2 | 3 | 2 | 2 | 4 | 3 | 2 | 1 |
| Total Suspended Solids (mg/L) | 3 | 1 | 2 | 4 | 4 | 4 | 3 | 8 | 6 | 3 | 2 |
| Carlson Trophic State Index (Secchi)* | 36 | 38 | 37 | 45 | 39 | 40 | 40 | 39 | 45 | 41 | 41 |
| Carlson Trophic State Index (Chl a)* | 44 | 31 | 40 | 46 | 44 | 47 | 42 | 41 | 64 | 36 | 46 |
| Carlson Trophic State Index (TP)* | 42 | 35 | 39 | 46 | 44 | 45 | 46 | 45 | 52 | 51 | 77 |
| *Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions. |