| Report Year: 2009 |
| Little Spirit Lake, Dickinson County |
| Summary Data Table |
| Parameter | 6/3/2009 | 7/7/2009 | 2009 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000 |
| Lake Depth (m) | 2.7 | 2.8 | 2.8 | 2.6 | 2.8 | 3.0 | 2.5 | 2.6 | 2.6 | 2.8 | 2.4 |
| Thermocline Depth (m) | Nil | 2.0 | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A |
| Secchi Disk Depth (m) | 0.7 | 2.0 | 1.3 | 0.4 | 0.5 | 0.9 | 1.3 | 1.1 | 0.6 | 0.9 | 0.3 |
| Temperature(oC) | 19.4 | 24.4 | 21.9 | 24.1 | 25.2 | 22.3 | 21.8 | 21.7 | 22.8 | 23.0 | 24.7 |
| Dissolved Oxygen (mg/L) | 7.5 | 11.9 | 9.7 | 13.8 | 16.3 | 8.8 | 10.1 | 10.3 | 7.8 | 9.8 | 8.1 |
| Dissolved Oxygen Saturation (%) | 81 | 143 | 111.9 | 168.7 | 201.0 | 100.8 | 113.9 | 115.3 | 90.9 | 115.4 | 98.3 |
| Specific Conductivity (μS/cm) | 500.0 | 540.0 | 520.0 | 419.1 | 467.4 | 500.5 | 549.3 | 548.3 | 635.4 | 524.5 | 487.5 |
| Turbidity (NTU) | 9.3 | 34.2 | 21.7 | 56.3 | 275.5 | 294.6 | 73.3 | 16.2 | 21.9 | 86.1 | 74.0 |
| Chlorophyll a (μg/L) | 6.0 | 16.0 | 11.0 | 179.8 | 101.3 | 186.8 | 56.5 | 26.4 | 49.7 | 56.4 | 44.9 |
| Total Phosphorus as P (μg/L) | 102 | 211 | 156 | 232 | 132 | 231 | 205 | 280 | 241 | 209 | 261 |
| SRP as P (μg/L) | 54 | 79 | 67 | 14 | 3 | 119 | 101 | 173 | 98 | - | - |
| Total Nitrogen as N (mg/L) | 1.33 | 2.14 | 1.74 | 2.58 | 2.29 | 3.19 | 2.66 | 2.70 | 2.46 | 4.12 | 2.14 |
| (Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L) | 65 | 16 | 33 | 16 | 21 | 40 | 561 | - | - | - | - |
| (Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L) | 12.5 | 0.4 | 6.5 | 5.0 | 5.7 | 13.2 | 89.2 | - | - | - | - |
| Nitrate + Nitrite (NO3 + NO2) as N (mg/L) | 0.22 | 0.12 | 0.13 | 0.31 | 0.42 | 1.80 | 0.33 | 0.60 | 0.55 | 2.10 | 0.28 |
| TN:TP ratio | 13 | 10 | 12 | 14 | 19 | 14 | 15 | 10 | 10 | 26 | 8 |
| pH | 8.8 | 9.1 | 9.0 | 9.1 | 8.8 | 8.7 | 8.9 | 8.8 | 8.6 | 8.6 | 8.4 |
| Alkalinity as CaCO3 (mg/L) | 243 | 238 | 241 | 183 | 202 | 208 | 234 | 197 | 231 | 183 | 205 |
| Silica as Si (mg/L) | - | - | - | - | - | 10.07 | 6.43 | 8.40 | 9.78 | - | - |
| Dissolved Organic Carbon (mg/L) | 10.64 | 11.39 | 11.02 | 26.42 | 9.49 | 9.27 | 19.98 | 19.99 | 25.72 | - | - |
| Inorganic Suspended Solids (mg/L) | 7 | 4 | 6 | 9 | 14 | 6 | 9 | 13 | 9 | 9 | 32 |
| Volatile Suspended Solids (mg/L) | 3 | 9 | 6 | 25 | 14 | 12 | 9 | 7 | 9 | 7 | 13 |
| Total Suspended Solids (mg/L) | 10 | 14 | 12 | 34 | 28 | 18 | 17 | 21 | 18 | 17 | 45 |
| Carlson Trophic State Index (Secchi)* | 65 | 50 | 56 | 72 | 69 | 62 | 57 | 59 | 68 | 62 | 78 |
| Carlson Trophic State Index (Chl a)* | 48 | 58 | 54 | 82 | 76 | 82 | 70 | 63 | 69 | 70 | 68 |
| Carlson Trophic State Index (TP)* | 71 | 81 | 77 | 83 | 75 | 83 | 81 | 85 | 83 | 81 | 84 |
| *Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions. |