| Report Year: 2009 |
| Lake Sugema, Van Buren County |
| Summary Data Table |
| Parameter | 6/17/2009 | 7/21/2009 | 2009 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000 |
| Lake Depth (m) | 8.0 | 7.8 | 7.9 | - | - | 8.8 | 8.7 | 8.5 | 8.5 | 8.3 | 9.2 |
| Thermocline Depth (m) | 5.1 | 5.0 | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A |
| Secchi Disk Depth (m) | 0.9 | 0.7 | 0.8 | - | - | 1.4 | 1.2 | 1.4 | 0.8 | 1.6 | 1.4 |
| Temperature(oC) | 22.3 | 23.0 | 22.7 | - | - | 26.7 | 23.8 | 24.6 | 27.4 | 22.0 | 25.5 |
| Dissolved Oxygen (mg/L) | 9.2 | 5.7 | 7.5 | - | - | 10.5 | 8.1 | 8.4 | 8.8 | 6.8 | 7.9 |
| Dissolved Oxygen Saturation (%) | 106 | 67 | 86.5 | - | - | 130.7 | 96.1 | 101.9 | 114.8 | 74.2 | 96.6 |
| Specific Conductivity (μS/cm) | 180.0 | 190.0 | 185.0 | - | - | 216.2 | 201.9 | 189.9 | 324.7 | 176.7 | 200.6 |
| Turbidity (NTU) | 9.8 | 10.0 | 9.9 | - | - | 10.0 | 9.1 | 8.5 | 16.2 | 6.0 | 31.9 |
| Chlorophyll a (μg/L) | 39.0 | 13.0 | 26.0 | - | - | 69.0 | 29.6 | 21.5 | 36.7 | 13.9 | 3.4 |
| Total Phosphorus as P (μg/L) | 52 | 60 | 56 | - | - | 46 | 44 | 39 | 52 | 45 | 138 |
| SRP as P (μg/L) | - | - | - | - | - | 1 | 1 | 2 | 1 | - | - |
| Total Nitrogen as N (mg/L) | 1.14 | 1.15 | 1.15 | - | - | 0.98 | 1.59 | 1.01 | 0.96 | 1.34 | 1.12 |
| (Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L) | 23 | 27 | 25 | - | - | 53 | 16 | - | - | - | - |
| (Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L) | 7.3 | 3.0 | 5.2 | - | - | 2.9 | 1.0 | - | - | - | - |
| Nitrate + Nitrite (NO3 + NO2) as N (mg/L) | 0.12 | 0.12 | 0.12 | - | - | 0.13 | 0.13 | 0.15 | 0.15 | 0.23 | 0.24 |
| TN:TP ratio | 22 | 19 | 21 | - | - | 23 | 34 | 28 | 20 | 29 | 10 |
| pH | 9.0 | 8.4 | 8.7 | - | - | 8.2 | 8.3 | 8.4 | 8.7 | 7.4 | 7.6 |
| Alkalinity as CaCO3 (mg/L) | 78 | 81 | 80 | - | - | 94 | 83 | 58 | 77 | 78 | 110 |
| Silica as Si (mg/L) | - | - | - | - | - | 2.64 | 1.74 | 1.87 | 3.07 | - | - |
| Dissolved Organic Carbon (mg/L) | 6.93 | 6.41 | 6.67 | - | - | 8.46 | 5.71 | 10.74 | 11.52 | - | - |
| Inorganic Suspended Solids (mg/L) | 1 | 5 | 3 | - | - | 3 | 3 | 2 | 4 | 4 | 3 |
| Volatile Suspended Solids (mg/L) | 8 | 8 | 8 | - | - | 6 | 5 | 6 | 7 | 5 | 4 |
| Total Suspended Solids (mg/L) | 9 | 13 | 11 | - | - | 9 | 7 | 8 | 10 | 8 | 7 |
| Carlson Trophic State Index (Secchi)* | 62 | 65 | 64 | - | - | 55 | 57 | 55 | 64 | 54 | 55 |
| Carlson Trophic State Index (Chl a)* | 67 | 56 | 63 | - | - | 72 | 64 | 61 | 66 | 56 | 43 |
| Carlson Trophic State Index (TP)* | 61 | 63 | 62 | - | - | 59 | 59 | 57 | 61 | 59 | 75 |
| *Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions. |