| Report Year: 2009 |
| Lake Minnewashta, Dickinson County |
| Summary Data Table |
| Parameter | 7/8/2009 | 6/3/2009 | 2009 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000 |
| Lake Depth (m) | 4.8 | 4.8 | 4.8 | 4.7 | 4.8 | 5.0 | 4.7 | 4.6 | 4.6 | 4.9 | 4.5 |
| Thermocline Depth (m) | Nil | Nil | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A |
| Secchi Disk Depth (m) | 2.7 | 2.5 | 2.6 | 1.4 | 1.9 | 2.0 | 1.6 | 1.9 | 0.7 | 3.1 | 1.2 |
| Temperature(oC) | 23.8 | 19.5 | 21.7 | 22.9 | 22.3 | 21.0 | 22.1 | 21.7 | 20.8 | 22.4 | 23.5 |
| Dissolved Oxygen (mg/L) | 7.0 | 11.7 | 9.4 | 8.6 | 9.3 | 9.3 | 8.3 | 7.8 | 9.2 | 10.0 | 8.0 |
| Dissolved Oxygen Saturation (%) | 83 | 128 | 105.2 | 100.3 | 106.6 | 103.6 | 94.3 | 87.7 | 101.5 | 119.7 | 93.9 |
| Specific Conductivity (μS/cm) | 450.0 | 490.0 | 470.0 | 487.0 | 504.2 | 526.5 | 565.5 | 525.9 | 535.4 | 500.5 | 509.3 |
| Turbidity (NTU) | 16.7 | 2.5 | 9.6 | 14.0 | 12.6 | 32.8 | 78.1 | 11.7 | 35.5 | 9.9 | 9.2 |
| Chlorophyll a (μg/L) | 2.0 | 5.0 | 3.5 | 27.3 | 21.5 | 13.0 | 24.7 | 14.8 | 37.1 | 7.5 | 16.1 |
| Total Phosphorus as P (μg/L) | 104 | 32 | 68 | 106 | 79 | 67 | 125 | 69 | 73 | 73 | 204 |
| SRP as P (μg/L) | 81 | 5 | 43 | 27 | 7 | 41 | 64 | 24 | 2 | - | - |
| Total Nitrogen as N (mg/L) | 1.11 | 0.73 | 0.92 | 1.21 | 1.40 | 1.05 | 1.56 | 1.24 | 1.20 | 0.83 | 1.49 |
| (Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L) | 244 | 58 | 151 | 76 | 87 | 114 | 396 | - | - | - | - |
| (Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L) | 23.0 | 9.3 | 16.2 | 12.0 | 7.8 | 9.9 | 30.3 | - | - | - | - |
| Nitrate + Nitrite (NO3 + NO2) as N (mg/L) | 0.12 | 0.12 | 0.12 | 0.20 | 0.27 | 0.32 | 0.23 | 0.17 | 0.17 | 0.36 | 0.18 |
| TN:TP ratio | 11 | 23 | 17 | 14 | 24 | 23 | 13 | 20 | 16 | 11 | 7 |
| pH | 8.3 | 8.7 | 8.5 | 8.5 | 8.5 | 8.4 | 8.4 | 8.3 | 8.4 | 8.2 | 8.2 |
| Alkalinity as CaCO3 (mg/L) | 203 | 217 | 210 | 203 | 177 | 199 | 209 | 156 | 196 | 175 | 199 |
| Silica as Si (mg/L) | - | - | - | - | - | 6.38 | 10.87 | 5.61 | 2.79 | - | - |
| Dissolved Organic Carbon (mg/L) | 6.15 | 6.62 | 6.39 | 6.89 | 6.61 | 4.98 | 9.29 | 10.68 | 10.54 | - | - |
| Inorganic Suspended Solids (mg/L) | 1 | 1 | 1 | 3 | 4 | 4 | 4 | 3 | 14 | 2 | 4 |
| Volatile Suspended Solids (mg/L) | 2 | 3 | 3 | 7 | 6 | 3 | 5 | 5 | 9 | 3 | 4 |
| Total Suspended Solids (mg/L) | 3 | 4 | 4 | 10 | 10 | 8 | 9 | 8 | 23 | 3 | 8 |
| Carlson Trophic State Index (Secchi)* | 46 | 47 | 47 | 55 | 51 | 50 | 53 | 51 | 66 | 44 | 58 |
| Carlson Trophic State Index (Chl a)* | 37 | 46 | 43 | 63 | 61 | 56 | 62 | 57 | 66 | 50 | 58 |
| Carlson Trophic State Index (TP)* | 71 | 54 | 65 | 71 | 67 | 65 | 74 | 65 | 66 | 66 | 81 |
| *Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions. |