COUNTY WELL INDEX (CWI) - WELL LOCATIONS

DODGE COUNTY, MINNESOTA

Field | Description
Main ID Information | Metadata Updated 2007
Title | Dodge County Aggregate Evaluation - County Well Index (CWI- MGS Database)
Filename | Cwi00pt3 (ArcView Shapefile)
Abstract | This dataset consists of the locations of wells drilled within Dodge County. The County Well Index (CWI) is a database that contains information about wells drilled throughout Minnesota. In this case, a subset of the locations was used to look at the geological descriptions of these wells. This version of the CWI file was downloaded from the Minnesota Geological Survey (MGS) in 2000.
Place Keywords | Dodge County, Minnesota
Theme Keywords | CWI, Wells, County Well Index, Geological Descriptions
Time Period of Content | Downloaded in 2000
Parent Theme | NA
Spatial Extent of the Data | Dodge County, Minnesota
Contact Person | Aggregate Resources Mapping Program
Contact Person Organization/Division | Department of Natural Resources, Division of Lands and Minerals
Contact Person Position | Geologist or GIS Specialist
Contact Address | 500 Lafayette Road, Box 45
Contact City | St. Paul
Contact Zip Code | 55155-4045
Contact Voice Phone | 651-259-5959
Contact Fax Phone | 651-296-5939
Additional ID Information |
Originator | Minnesota Geological Survey
Purpose | This dataset contains the locations of the wells that were used for this study. Approximately 700 of the 1,100 wells contained geological descriptions that were used in this study.
Progress | Complete
Currentness Reference | 2001
Maintenance Frequency | The CWI database maintained by MGS is updated quarterly. This subset was downloaded in 2000 and provides part of the background information that was used in developing the aggregate resource mapping units in Dodge County.
Access Constraints | NA
Use Constraints | NA
Associated Data Sets | County Aggregate Mapping Program datasets for Dodge County, including data on sand and gravel potential, crushed stone potential, field observations, rock piles, and test pit quality data. A specific table, cwistrat.dbf, can be related using a one-to-many (cwiwells-to-cwistrat) relate on relateid.
Data Quality |
Attribute Accuracy |
Logical Consistency | NA
Completeness | The locational accuracy of these points varies. Some of the points were field checked down to the meter, while others are located to the centroid of a 40-acre parcel, a 10-acre parcel, … Download CWI from the Minnesota Geological Survey for a complete and up-to-date version.
Horizontal Positional Accuracy |
Vertical Positional Accuracy | NA
Lineage | The geological descriptions associated with the well locations were used to make interpretations and test interpretations about the geology, aggregate resources, and glacial and bedrock history of the area.
Source Scale Denominator |
Spatial Reference |
Horizontal Coordinate Scheme | UTM
Ellipsoid | GRS80
Horizontal Datum | NAD83
Horizontal Units | Meters
Distance Resolution | NA
Altitude Datum | NA
Altitude Units | NA
Depth Datum | NA
Depth Units | NA
UTM Zone Number | 15 Extended
Raster only |
Cell Width | NA
Cell Height | NA
Spatial Data Organization |
Geographic Reference for Tabular Data | These points represent individual wells drilled throughout Dodge County by a variety of sources.
Native Dataset Environment | ArcView 3.1 / ArcInfo 8.0.2
Vendor Specific Object Type | NA
Tiling Scheme | NA
Spatial Object Type | Point
Transfer Size | 164 kb
Entities -- Attributes |
Entity-Attribute Overview | These points represent individual wells drilled throughout Dodge County by a variety of sources; referred to as the CWI.
Entity-Attribute Detailed Citation | ArcView specific fields include shape (i.e., feature type = point), area (0 for points), perimeter (0 for points), cwiwells_ (unique id for point, assigned by the Arc/INFO software), cwiwells_i (an id usually assigned during theme creation). CWI point attributes are described in the table below.

Table Name | Field Name | Begin Column | Definition | Valid Values | Descriptions
Cwiwells.shp | Relateid |  | Text, 10 | Ex: 0000101209, 0000101222 | These are the unique identifiers for the wells (Relate item with cwistrat.dbf).
| Township |  | Number,11,0 | Ex: 105, 106,107 | Township Number
| Range |  | Number,11,0 | Ex: 16, 17, 18, etc... | Range Number
| Section |  | Text, 11 | Ex: 1,2,3,4,5,6, etc... | Section number
| Subsection |  | Text, 6 | Ex: ABBCAA | Subsection number (A = NE, B = NW, C = SW, D = SE).
| Dpth_bdrk |  | Number,11,0 | Ex: 0,40, 55, 120, 235, etc… | Describes the depth to the first bedrock encountered. Surface elevation minus bedrock elevation.
| First_bdrk |  | Text, 4 | Ex: KRET, OGAL, OMAQ | Abbreviation of the first bedrock unit encountered while drilling. The First letter refers to the age of the rock type. (K-Cretaceous, O-Ordovician U – undifferentiated). See MGS CWI database for more details.
| Hadgeodesc |  | Text, 1 | Ex: Y or N | This indicates if the well has a related stratigraphic log.