December 2010 Final Indian Creek, Dago Slough, and Prairie Creek LRS/TMDL
5 | P a g e
List of Figures
Figure 1 - Indian Creek/Dago Slough Watershed and Sample Sites.................................. 14
Figure 2 - Prairie Creek/Middle Creek Watershed and Sample Sites ................................ 15
Figure 3 - Locations of Project Watersheds in the State ...................................................... 16
Figure 4 - Prairie Creek Manganese Results ........................................................................ 25
Figure 5 - Prairie Creek Phosphorous Results ..................................................................... 25
Figure 6 - Prairie Creek Total Suspended Solids Results .................................................... 26
Figure 7 - Indian Creek Phosphorous Results ..................................................................... 28
Figure 8 - Indian Creek Total Suspended Solids Results .................................................... 28
Figure 9 - Dago Slough Phosphorous Results ..................................................................... 30
Figure 10 - Dago Slough Total Suspended Solids Results .................................................. 30
Figure 11 - Prairie Flow Duration Curve.............................................................................. 34
Figure 12 - Prairie Creek Annual Average Hydrograph .................................................... 35
Figure 13 - Indian Creek Flow Duration Curve ................................................................... 36
Figure 14 - Indian Creek Annual Average Hydrograph ..................................................... 37
Figure 15 - Dago Slough Flow Duration Curve ................................................................... 38
Figure 16 - Dago Slough Annual Average Hydrograph ..................................................... 39
Figure 17 - Prairie Precipitation Graph – Carthage Station (#111316), Illinois State Water
Survey .................................................................................................................................... 40
Figure 18 - Indian/Dago Precipitation Graph – Galesburg Station (#113320), Illinois State
Water Survey .......................................................................................................................... 41
Figure 19 - Location of Active Septic Systems Indian Creek and Dago Slough ............... 43
Figure 20 - Location of Active Septic Systems Prairie Creek .............................................. 44
Figure 21 - Prairie Creek Soils ............................................................................................... 47
Figure 22 - Prairie/Middle Creek HEL Crop Ground and Land Treated with BMPs ...... 49
Figure 23 - HEL Soil Breakdown by Landcover Type, Prairie/Middle Creek ................... 50
Figure 24 - HEL Soils, Prairie/Middle Creek........................................................................ 51
Figure 25 - Farmed HEL soils, Prairie/Middle Creek .......................................................... 52
Figure 26 - Hydric Soils, Prairie/Middle Creek ................................................................... 53
Figure 27 - Indian Creek/Dago Slough Soils ........................................................................ 54
Figure 28 - Indian Creek/Dago Slough HEL Crop Ground and Land Treated with BMPs
................................................................................................................................................ 57
Figure 29 - HEL Soil Breakdown by Landcover Type, Indian Creek/Dago Slough ......... 58
Figure 30 - HEL Soils, Indian Creek/Dago Slough .............................................................. 59
Figure 31 - Farmed HEL Soils, Indian Creek/Dago Slough ................................................ 60
Figure 32 - Hydric Soils, Indian Creek/Dago Slough .......................................................... 61
Figure 33 - Prairie Creek/Middle Creek Slope ..................................................................... 62
Figure 34 - Prairie Creek/Middle Creek Slope ..................................................................... 63
Figure 35 - Prairie Creek/Middle Creek 100 Year Floodplain Map ................................... 64
