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.