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Legend for the Illinois Water Well (ILH2O) Internet Map Service

Well Status

Symbol

Layer

Description

Metadata

Dry Well Dry Dry well IL_WELLS_Borings_Location_Pt.html
Engineering boring Engineering Engineering boring IL_WELLS_Borings_Location_Pt.html
Stratigraphic boring Stratigraphic Stratigraphic boring IL_WELLS_Borings_Location_Pt.html
Water Well Water Water well IL_WELLS_Borings_Location_Pt.html

Reference Data

Interstates Interstates Interstates and toll roads in Illinois IL_INFRA_ROADS_Interstate_Ln.html
U.S. Highways US Highways U.S. Highways in Illinois IL_INFRA_ROADS_US_Highways_Ln.html
State Routes State Routes Illinois state roads IL_INFRA_ROADS_State_Routes_Ln.html
PLSS Section Boundaries Section Section boundaries in the Illinois Public Land Survey System IL_PLSS_Sections.html
PLSS Township and Range Boundaries Township Township and Range boundaries in the Illinois Public Land Survey System IL_PLSS_Township_Range.html
USGS 7.5 Minute Quadrangle Index Quad Index of U.S. Geological Survey 7.5-minute quadrangle map series for Illinois IL_QUAD_24K_Index_Py_Nad83.html
County Boundaries County Illinois county boundaries IL_BNDY_County.html
Lakes and Streams Lakes and Streams Water bodies IL_Streams_From_100K_DLG_Ln.html
Municipal Boundaries Municipalities Municipal boundaries in Illinois for incorporated places IL_ADMIN_Municipality_2000_Py.html

Geologic Data

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Layer

Description

Metadata

Bedrock Topography, Elev 0 ft above Mean Sea Level
Bedrock Topography, Elev 200 ft above Mean Sea Level
Bedrock Topography, Elev 400 ft above Mean Sea Level
Bedrock Topography, Elev 600 ft above Mean Sea Level
Bedrock Topography, Elev 800 ft above Mean Sea Level
Bedrock Topography, Elev 1000 ft above Mean Sea Level
Bedrock Topography Buried bedrock surface of Illinois. Useful for the regional and statewide studies such as groundwater resource planning and geologic mapping because some of the most extensive and productive aquifers in the state are located in thick glacial sediments of major buried bedrock valleys. IL_Bedrock_Topography_1994_Ln.html
Major sand and gravel aquifers in Illinois Sand and Gravel Major sand and gravel aquifers in Illinois. Distribution of major sand and gravel aquifers at any depth. Generally, the tops of such aquifers lie within 300 feet of the surface and the bases occur within 500 feet. IL_Maj_Sand_And_Gravel_Aq_Py.html
Coarse-grained Materials within 50 feet of ground surface Aquifer < 50 feet Coarse-grained materials within 50 feet of the ground surface in Illinois. This includes bedrock, sand and gravel, and alluvial units with characteristics that suggest a potential to store or conduct groundwater. IL_Shallow_Coarse_Materials_Py.html
no Glacial Drift
Glacial Drift less than 25 feet thick
Glacial Drift 25 to 50 feet thick
Glacial Drift 50 to 100 feet thick
Glacial Drift 100 to 200 feet thick
Glacial Drift 200 to 300 feet thick
Glacial Drift 300 to 400 feet thick
Glacial Drift 400 to 500 feet thick
Glacial Drift greater than 500 feet thick
Drift Thickness Glacial drift in Illinois: thickness and character. Unconsolidated deposits, mainly glacial drift, overlie the bedrock surface in most of Illinois. The thickest drift occurs in major preglacial valleys cut into the bedrock and filled with glacial sediments. IL_Drift_Thickness.html
Major bedrock aquifers within 300 feet of ground surface. Aquifer < 300 feet Major bedrock aquifers within 300 feet of ground surface. Cover most of northern Illinois; commonly overlain by thin layers of less permeable silts and clays. IL_Maj_Bedrock_Aq_Lt_300_Ft_Py.html
Major bedrock aquifers within 500 feet of ground surface. Aquifer < 500 feet Major bedrock aquifers within 500 feet of ground surface. Cover most of northern Illinois; many are directly overlain by shallow or major sand and gravel aquifers. IL_Maj_Bedrock_Aq_Lt_500_Ft_Py.html
Major bedrock aquifers greater than 500 feet below ground surface, TDS less than 2,500 mg/L, Potable Water.
Major Bedrock Aquifers Greater than 500 feet Below ground surface, TDS 2,500 to 10,000 mg/L.
Major Bedrock Aquifers Greater than 500 feet Below ground surface, TDS greter than 10,000 mg/L.
Aquifer > 500 feet Major bedrock aquifers greater than 500 feet below ground surface. Groundwater quality with in deep major bedrock aquifers degrades from northwest to southeast in the northern portion of Illinois, due to the regional inclination of geological units toward the center of the Illinois Basin in southeastern Illinois. IL_Maj_Bedrock_Aq_Gt_500_Ft_Py.html
Karst Areas Karst Areas Sinkhole areas (an indicator of karst terrain) in Illinois. Areas that contain sinkholes are susceptible to aquifer contamination and may also lack the stability required for certain land uses. IL_Sinkhole_Areas_Py.html

Base Data

Symbol

Layer

Description

Metadata

n/a Eastern DOQ
UTM Zone 16
Illinois Digital Orthophoto Quadrangle (DOQ) data in Universal Transverse Mercator, Zone 16, NAD83. IL_DOQ_2005_MOSAIC_UTM16_RAS.html
n/a Western DOQ
UTM Zone 15
Illinois Digital Orthophoto Quadrangle (DOQ) data in Universal Transverse Mercator, Zone 15, NAD83 IL_DOQ_2005_MOSAIC_UTM15_RAS.html
n/a Statewide DRG US Geological Survey Digital Raster Graphic (DRG) images for Illinois IL_DRG_MOSAIC_24K_RAS.html

 

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ILLINOIS STATE GEOLOGICAL SURVEY
INSTITUTE OF NATURAL RESOURCE SUSTAINABILITY     |    UNIVERSITY OF ILLINOIS AT URBANA-CHAMPAIGN

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Updated 4/14/2009 SKB