| Report Year: 2009 |
| Eldred Sherwood Lake, Hancock County |
| Summary Data Table |
| Parameter | 6/25/2009 | 7/30/2009 | 2009 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000 |
| Lake Depth (m) | 5.7 | 5.9 | 5.8 | 5.8 | 6.0 | 6.4 | 4.6 | 6.2 | 6.3 | 6.3 | 6.3 |
| Thermocline Depth (m) | 0.8 | 1.2 | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A |
| Secchi Disk Depth (m) | 2.1 | 0.6 | 1.4 | 1.1 | 1.7 | 1.3 | 1.1 | 1.8 | 0.9 | 2.0 | 1.1 |
| Temperature(oC) | 22.9 | 22.3 | 22.6 | 24.3 | 22.5 | 25.4 | 22.5 | 21.9 | 22.7 | 21.3 | 23.0 |
| Dissolved Oxygen (mg/L) | 15.8 | 16.2 | 16.0 | 13.0 | 10.1 | 16.4 | 14.0 | 16.2 | 12.9 | 19.8 | 14.7 |
| Dissolved Oxygen Saturation (%) | 184 | 186 | 184.8 | 155.7 | 116.1 | 200.0 | 161.1 | 182.6 | 149.7 | 220.9 | 173.9 |
| Specific Conductivity (μS/cm) | 570.0 | 500.0 | 535.0 | 449.2 | 518.7 | 497.7 | 516.2 | 517.3 | 644.9 | 551.4 | 520.8 |
| Turbidity (NTU) | 0.4 | 8.4 | 4.4 | 7.5 | 25.8 | 5.6 | 9.9 | 8.0 | 32.1 | 7.3 | 12.0 |
| Chlorophyll a (μg/L) | 10.0 | 68.0 | 39.0 | 32.7 | 21.0 | 88.5 | 73.7 | 16.0 | 95.0 | 25.0 | 9.3 |
| Total Phosphorus as P (μg/L) | 28 | 85 | 56 | 103 | 62 | 74 | 163 | 58 | 80 | 67 | 184 |
| SRP as P (μg/L) | 1 | - | 1 | 1 | - | - | 53 | 1 | 1 | - | - |
| Total Nitrogen as N (mg/L) | 12.04 | 10.99 | 11.52 | 6.68 | 7.02 | 11.20 | 11.94 | 10.84 | 9.31 | 12.72 | 8.23 |
| (Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L) | 16 | 45 | 31 | 52 | 194 | 65 | 65 | - | - | - | - |
| (Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L) | 2.1 | 4.7 | 3.4 | 12.5 | 11.9 | 13.6 | 10.0 | - | - | - | - |
| Nitrate + Nitrite (NO3 + NO2) as N (mg/L) | 11.63 | 9.08 | 10.36 | 5.53 | 5.74 | 10.30 | 11.01 | 9.27 | 7.80 | 12.11 | 6.32 |
| TN:TP ratio | 436 | 130 | 283 | 128 | 162 | 178 | 80 | 223 | 119 | 192 | 49 |
| pH | 8.5 | 8.4 | 8.4 | 8.7 | 8.1 | 8.8 | 8.5 | 8.5 | 8.6 | 8.4 | 7.4 |
| Alkalinity as CaCO3 (mg/L) | 228 | 175 | 202 | 180 | 209 | 172 | 187 | 131 | 184 | 185 | 200 |
| Silica as Si (mg/L) | - | - | - | - | - | 9.36 | 10.41 | 6.09 | 8.52 | - | - |
| Dissolved Organic Carbon (mg/L) | 3.97 | 5.70 | 4.84 | 5.16 | 4.85 | 5.62 | 6.70 | 7.98 | 9.63 | - | - |
| Inorganic Suspended Solids (mg/L) | 3 | 5 | 4 | 3 | 3 | 3 | 8 | 7 | 3 | 13 | 3 |
| Volatile Suspended Solids (mg/L) | 1 | 15 | 8 | 5 | 4 | 6 | 7 | 4 | 7 | 9 | 4 |
| Total Suspended Solids (mg/L) | 4 | 20 | 12 | 9 | 7 | 9 | 14 | 9 | 10 | 21 | 8 |
| Carlson Trophic State Index (Secchi)* | 49 | 67 | 56 | 59 | 52 | 57 | 59 | 52 | 62 | 50 | 58 |
| Carlson Trophic State Index (Chl a)* | 53 | 72 | 67 | 65 | 60 | 75 | 73 | 58 | 75 | 62 | 52 |
| Carlson Trophic State Index (TP)* | 52 | 68 | 62 | 71 | 64 | 66 | 78 | 63 | 67 | 65 | 79 |
| *Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions. |