| Report Year: 2009 |
| Crawford Creek Impoundment, Ida County |
| Summary Data Table |
| Parameter | 6/1/2009 | 7/6/2009 | 2009 | 2007 | 2006 | 2005 | 2004 | 2003 | 2002 | 2001 | 2000 |
| Lake Depth (m) | 7.9 | 8.0 | 8.0 | 7.8 | 7.2 | 8.5 | 8.2 | 8.1 | 8.1 | 8.5 | 7.2 |
| Thermocline Depth (m) | Nil | 4.2 | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A | N/A |
| Secchi Disk Depth (m) | 1.5 | 1.4 | 1.4 | 1.0 | 1.2 | 1.4 | 1.3 | 0.9 | 1.3 | 1.4 | 1.0 |
| Temperature(oC) | 18.7 | 23.9 | 21.3 | 24.3 | 21.7 | 22.7 | 21.5 | 23.3 | 22.4 | 23.8 | 24.8 |
| Dissolved Oxygen (mg/L) | 5.8 | 13.2 | 9.5 | 8.6 | 9.4 | 9.9 | 9.6 | 9.6 | 9.6 | - | 6.3 |
| Dissolved Oxygen Saturation (%) | 62 | 157 | 109.2 | 102.6 | 106.6 | 114.4 | 109.9 | 113.0 | 110.3 | - | 76.2 |
| Specific Conductivity (μS/cm) | 520.0 | 410.0 | 465.0 | 460.8 | 450.7 | 482.1 | 480.7 | 430.7 | 471.3 | 487.6 | 693.1 |
| Turbidity (NTU) | 39.9 | 3.8 | 21.8 | 8.9 | 20.2 | 18.4 | 21.6 | 15.6 | 12.0 | 10.5 | 9.4 |
| Chlorophyll a (μg/L) | 9.0 | 6.0 | 7.5 | 16.9 | 66.9 | 49.7 | 8.5 | 33.7 | 11.0 | 10.0 | 11.6 |
| Total Phosphorus as P (μg/L) | 36 | 43 | 39 | 63 | 64 | 50 | 39 | 75 | 59 | 43 | 226 |
| SRP as P (μg/L) | - | - | - | 4 | 1 | 1 | 2 | 2 | 1 | - | - |
| Total Nitrogen as N (mg/L) | 1.43 | 0.75 | 1.09 | 1.18 | 1.57 | 1.01 | 0.72 | 1.12 | 1.00 | 1.01 | 0.89 |
| (Phenate)Ammonia Nitrogen (NH3 + NH4+) as N (μg/L) | 62 | 16 | 37 | 44 | 23 | 35 | 18 | - | - | - | - |
| (Phenate)Ammonia Nitrogen (NH3) as N (un-ionized)(μg/L) | 6.3 | 3.0 | 4.7 | 4.0 | 2.1 | 6.3 | 2.2 | - | - | - | - |
| Nitrate + Nitrite (NO3 + NO2) as N (mg/L) | 0.50 | - | 0.50 | 0.59 | 0.12 | 0.12 | 0.12 | 0.12 | 0.14 | 0.13 | 0.13 |
| TN:TP ratio | 40 | 18 | 29 | 19 | 29 | 22 | 19 | 15 | 21 | 26 | 6 |
| pH | 8.5 | 8.8 | 8.7 | 8.4 | 8.5 | 8.7 | 8.6 | 8.3 | 8.7 | 8.4 | 8.2 |
| Alkalinity as CaCO3 (mg/L) | 240 | 169 | 205 | 191 | 179 | 184 | 189 | 146 | 178 | 143 | 190 |
| Silica as Si (mg/L) | - | - | - | - | - | 2.49 | 0.74 | 1.90 | 1.87 | - | - |
| Dissolved Organic Carbon (mg/L) | 4.91 | 4.65 | 4.78 | 5.05 | 4.89 | 7.12 | 5.72 | 9.65 | 9.57 | - | - |
| Inorganic Suspended Solids (mg/L) | 2 | 1 | 1 | 4 | 5 | 4 | 4 | 8 | 3 | 7 | 3 |
| Volatile Suspended Solids (mg/L) | 5 | 5 | 5 | 5 | 11 | 4 | 4 | 8 | 6 | 4 | 3 |
| Total Suspended Solids (mg/L) | 7 | 7 | 7 | 8 | 16 | 9 | 8 | 16 | 10 | 11 | 6 |
| Carlson Trophic State Index (Secchi)* | 54 | 56 | 55 | 60 | 58 | 56 | 56 | 62 | 56 | 55 | 59 |
| Carlson Trophic State Index (Chl a)* | 52 | 48 | 50 | 58 | 72 | 69 | 52 | 65 | 54 | 53 | 55 |
| Carlson Trophic State Index (TP)* | 56 | 58 | 57 | 64 | 64 | 61 | 57 | 66 | 63 | 58 | 82 |
| *Index values generally range between 0 and 100, with increasing values indicating more eutrophic conditions. |