| Report Year: 2009 |
| Avenue of the Saints Lake, Bremer County |
| Summary Data Table |
| Parameter | 7/29/2009 | 6/24/2009 | 2009 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000 |
| Lake Depth (m) | 5.7 | 5.7 | 5.7 | - | - | 5.6 | 6.3 | 4.3 | 3.7 | 5.0 | 5.2 |
| Thermocline Depth (m) | 0.6 | 1.8 | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A |
| Secchi Disk Depth (m) | 0.6 | 0.4 | 0.5 | - | - | 0.4 | 0.4 | 1.2 | 0.6 | 0.7 | 0.6 |
| Temperature(oC) | 26.2 | 25.7 | 25.9 | - | - | 25.5 | 22.6 | 23.3 | 24.3 | 24.1 | 23.6 |
| Dissolved Oxygen (mg/L) | 9.6 | 11.2 | 10.4 | - | - | 8.9 | 10.1 | 9.9 | 9.9 | 8.4 | 10.3 |
| Dissolved Oxygen Saturation (%) | 118 | 138 | 128.1 | - | - | 108.4 | 118.1 | 117.2 | 121.3 | 108.8 | 123.5 |
| Specific Conductivity (μS/cm) | 300.0 | 230.0 | 265.0 | - | - | 224.8 | 318.7 | 275.3 | 327.9 | 196.7 | 270.3 |
| Turbidity (NTU) | 16.1 | 31.5 | 23.8 | - | - | 144.8 | 45.2 | 25.4 | 95.0 | 40.2 | 164.5 |
| Chlorophyll a (μg/L) | 24.0 | 67.0 | 45.5 | - | - | 176.4 | 65.6 | 16.8 | 49.7 | 47.0 | 19.6 |
| Total Phosphorus as P (μg/L) | 131 | 126 | 128 | - | - | 202 | 363 | 114 | 119 | 117 | 136 |
| SRP as P (μg/L) | 20 | 1 | 10 | - | - | 68 | 193 | 23 | 7 | - | - |
| Total Nitrogen as N (mg/L) | 1.28 | 1.71 | 1.50 | - | - | 1.34 | 2.91 | 1.46 | 1.13 | 1.80 | 1.52 |
| (Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L) | 16 | - | 16 | - | - | 59 | 157 | - | - | - | - |
| (Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L) | 3.5 | - | 3.5 | - | - | 4.4 | 14.7 | - | - | - | - |
| Nitrate + Nitrite (NO3 + NO2) as N (mg/L) | - | - | - | - | - | 0.12 | 1.52 | 0.29 | 0.15 | 0.73 | 0.27 |
| TN:TP ratio | 10 | 14 | 12 | - | - | 7 | 8 | 13 | 10 | 15 | 11 |
| pH | 9.2 | 9.5 | 9.3 | - | - | 8.8 | 8.9 | 8.2 | 8.2 | 8.4 | 6.9 |
| Alkalinity as CaCO3 (mg/L) | 83 | 76 | 80 | - | - | 90 | 90 | 74 | 109 | 87 | 116 |
| Silica as Si (mg/L) | - | - | - | - | - | 4.15 | 5.63 | 2.20 | 1.49 | - | - |
| Dissolved Organic Carbon (mg/L) | 7.11 | 6.75 | 6.93 | - | - | 8.81 | 6.62 | 10.65 | 10.21 | - | - |
| Inorganic Suspended Solids (mg/L) | 7 | 9 | 8 | - | - | 6 | 11 | 6 | 10 | 8 | 12 |
| Volatile Suspended Solids (mg/L) | 13 | 18 | 16 | - | - | 18 | 17 | 8 | 9 | 9 | 9 |
| Total Suspended Solids (mg/L) | 20 | 27 | 23 | - | - | 24 | 27 | 14 | 19 | 17 | 20 |
| Carlson Trophic State Index (Secchi)* | 67 | 73 | 70 | - | - | 74 | 73 | 58 | 69 | 66 | 68 |
| Carlson Trophic State Index (Chl a)* | 62 | 72 | 68 | - | - | 81 | 72 | 58 | 69 | 68 | 60 |
| Carlson Trophic State Index (TP)* | 74 | 74 | 74 | - | - | 81 | 89 | 72 | 73 | 73 | 75 |
| *Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions. |