Metadata for Montana Watersheds and Subbasins, 1999 Metadata for Montana Watersheds and Subbasins, 1999

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Identification Information:

Citation:

Originator: USDA Natural Resources Conservation Service

Publication date: 11/12/1996

Title: Montana Watersheds and Subbasins, 1999

Publication place: Helena, Montana
Publisher: Montana State Library

Other citation details: The former name of this data set was "hd109"

Larger Work Citation:

Title: Montana Watershed Boundary Database, 2006 Version
Online linkage: http://mslapps.mt.gov/Geographic_Information/Data/DataList/datalist_Details.aspx?did={0077A7D3-F6C3-4D08-9837-410E79A12FCC}

Browse graphic file name: https://ftpgeoinfo.msl.mt.gov/Documents/Maps/Individual/19990616_485_1999_Watersheds5thCode.gif

Abstract:

This data set contains hydrologic unit boundaries at the Watershed (5th-Code) level. The data set was developed by delineating the boundary lines on 1:100,000 scale base maps or overlays and digitizing the delineated lines. 5th-code number assignment is subject to change in 4th-code units that span state boundaries as final 5th-code boundaries are developed for North Dakota, South Dakota, and Wyoming. This dataset is distributed with a companion layer dissolved from it, called Subbasin_1999, that contains the 4th-code sub-basins.

Purpose:

The watershed hydrologic unit boundary provides a uniquely identified and uniform method of subdividing large drainage areas. These smaller sized hydrologic units (approximately 40,000 to 250,000 acres) are useful in many programs supported by the Natural Resources Conservation Service and others.

Time period of content:

Calendar date: 1996
Currentness reference: Publication Date

Access constraints: None

Use constraints:

The Montana State Library provides this product/service for informational purposes only. The Library did not produce it for, nor is it suitable for legal, engineering, or surveying purposes. Consumers of this information should review or consult the primary data and information sources to ascertain the viability of the information for their purposes. The Library provides these data in good faith but does not represent or warrant its accuracy, adequacy, or completeness. In no event shall the Library be liable for any incorrect results or analysis; any direct, indirect, special, or consequential damages to any party; or any lost profits arising out of or in connection with the use or the inability to use the data or the services provided. The Library makes these data and services available as a convenience to the public, and for no other purpose. The Library reserves the right to change or revise published data and/or services at any time

The U.S. Department of Agriculture, Natural Resources Conservation Service, Montana State Office, should be acknowledged as the data source in products derived from these data.

This data set is to be used as a primary reference source. This is public information and may be interpreted by organizations, agencies, units of government, or other based on needs, however, they are responsible for the appropriate application. Federal, State, or local regulatory bodies are not to reassign to the Natural Resources Conservation Service any authority for the decisions they make. Photographic or digital enlargement of this map to scales greater than 1:100,000 can cause misrepresentation of the data. If enlarged, the maps will not include the fine detail that would be appropriate for mapping at the large scale. Digital data files are periodically updated. Files are dated, and users are responsible for obtaining the latest revision of the data.

The U.S. Department of Agriculture, nor any of its agencies are liable for misuse of the data. Nor is it liable for damage, transmission of viruses, or computer contamination through the distribution of these data sets.

Point of contact:

Montana State Library
PO Box 201800
Helena, Montana 59620-1800
Telephone: 406-444-5354
TDD/TTY telephone: Montana Relay 711
Fax: 406-444-0266
E-Mail: geoinfo@mt.gov

Data Quality Information:

Attribute accuracy report:

Polygon identifiers are manually checked with the original base map using the attribute file. Verification on polygon identification continuity of each side of a neatline is done visually on the computer screen as adjacent quad representations are assembled into larger area data layers.

Logical consistency report:

Certain node/geometry and topology polygon/chain relationships are collected or generated to satisfy topological requirements including: chains must begin and end at nodes and there are no duplicate lines or sliver polygons. Data beyond the state boundary is not included and is clipped at the boundary. All internal polygons are texted for closure and are checked using hard copy check plots. All data are checked for common boundary lines (i.e. adjacent polygons with the same label).

Completeness report:

The data is complete for the state of Montana. Meets national USDA NRCS specifications for the delineation of 5th-Code watersheds. Further delineation at the Sub-watershed (6th-code) level will be completed on an as-needed basis to meet USDA NRCS mission objectives. Sub-watersheds (10,000 to 40,000 acres) will be delineated using a base map scale of 1:24,000. The Subwatershed coverage will meet specifications as set forth in Natural Resources Conservation Service National Instruction 170-304 (revised).

Horizontal Positional Accuracy Report:

The approximate horizontal accuracy of the base maps is 51 meters, assuming they meet National Map Accuracy Standards. The accuracy of the watershed maps is generally based on contour information available for the base maps. Such data may be supplemented with site visits to locate ridge lines for hydrologic unit boundaries in flat terrain areas or to identify changes in drainage patterns due to human or geologic activity. The difference in positional accuracy between the hydrologic unit boundaries and their digitized map locations is unknown.

Hydrologic unit boundaries generally were digitized to be within 0.01 inches of their locations on the digitizing source (25 meters on the ground). The digital map elements are edge matched against the data for the adjacent quadrangle. Edge match locations generally do not deviate from centerline to centerline by more than 0.01 inches.

Lineage:

Source information:

Originator:: National Mapping Division
U.S. Geological Survey
Title: 1:100,000-scale quadrangles
Source scale denominator: 100000
Type of source media: stable based media or paper
Source contribution:: These are the base maps upon which the watershed boundaries were drafted and digitized from.
Beginning date: 1950
Ending date: 1996

Source information:

Originator:: USDA Natural Resources Conservation Service
Montana State Office
Publication date: 1996
Title: 5th-Code Watersheds
Source scale denominator: 100000
Type of source media: stable base media or paper
Source contribution: These are the watershed maps that were digitized.
Calendar date: 1996

Source information:

Originator: U.S. Department of Agriculture
Publication date: 06/01/1995
Title:: Mapping and Digitizing Watershed and Subwatershed HUC Boundaries
Other citation details:: NRCS National Instruction 170-304
Available at http://www.nhq.nrcs.usda.gov/hu/intro.html
Type of source media: text
Source contribution:: These are the NRCS national guidelines for mapping and digitizing watersheds that were followed in preparation of this data set.
Calendar date: 06/01/1995

Source information:

Originator: Idaho Department of Water Resources
Publication date: 1996
Title: Idaho 5th-Code Watersheds
Source scale denominator: 100000
Type of source media: electronic file
Source contribution:: This is the source of the 5th-Code watershed boundaries in Idaho.
Calendar date: 1996

Process step:

Draft watershed boundaries on base maps based on the stream network and contours shown on the base maps and based on field investigations.


Process date: 1996

Process step:

Digitize 1:100,000 scale hydrologic unit quadrangles in GRASS GIS.


Process date: 1996

Process step:

Project quads from UTM zone 11 and 13 into zone 12 and match all the edges


Process date: 1996

Process step:

Verification of draft delineations by Montana NRCS field staff.


Process date: 04/01/1996

Process step:

Verification of draft delineations by U.S. Forest Service Region One field staff.


Process date: 09/01/1996

Process step: Quality check digital data and hard copy plots.


Process date: 10/01/1996

Process step:

Convert data from GRASS to Arc/Info format at Montana State Library.


Process date: 10/03/1996

Process step:

Correct errors introduced by the Arc/Info conversion process. Project data to State Plane Coordinates and add complete boundaries of HUCs that cross the Idaho state line.


Process date: 11/01/1996

Process step:

changed coding of lines and polys between 17010101090 and 17010102040 per faxed transmittal from NRCS Bozeman at request of FWP knowledge of watershed character.


Process date: 06/14/1999

Spatial Data Organization Information:

Point and vector object information:

SDTS object type: Complete Chain

SDTS object count: 4028

SDTS object type: GT-polygon composed of chains

SDTS object count: 889

Spatial Reference Information:

Horizontal coordinate system definition:

Grid coordinate system name: State Plane Coordinate System 1983

SPCS zone identifier: 2500

Lambert conformal conic:

Standard parallel: 45
Standard parallel: 49
Longitude of central meridian: -109.5
Latitude of projection origin: 44.25
False easting: 600000.00000
False northing: 0.00000

Planar distance units: meters

Geodetic model:

Horizontal datum name: North American Datum of 1983
Ellipsoid name: Geodetic Reference System 80
Semi-major axis: 6378137
Denominator of flattening ratio: 298.257

Entity and Attribute Information:

Entity type label: Watershed_1999

Entity type definition: Feature Class

Attribute label: FID

Attribute definition: Internal feature number.

Attribute label: Shape

Attribute definition: Feature geometry.

Attribute label: AREA

Attribute definition: Area of polygon in square meters

Attribute label: PERIMETER

Attribute definition: Area of polygon in square meters

Attribute label: HD109_

Attribute definition:: Internal feature number from original coverage version of the data

Attribute label: HD109_ID

Attribute definition: User ID number from original coverage version of the data

Attribute label: FIFTHCODE

Attribute definition: 5th-Code watershed Hydrologic Unit Code (HUC) number
Range domain minimum: 10010001010
Range domain maximum: 17010213140

Attribute label: FOURCODE

Attribute definition: 4th-Code sub-basin Hydrologic Unit Code (HUC) number
Range domain minimum: 10010001
Range domain maximum: 17010213

Attribute label: ACRES

Attribute definition: Area of 5th-Code watershed in acres
Range domain minimum: 1477
Range domain maximum: 284938

Attribute label: NAME

Attribute definition:: Name of the 4th-code sub-basin that contains this 5th-code watershed

Distribution Information:

Distributor:

Montana State Library
PO Box 201800
Helena, MT 59620-1800
Telephone: 406-444-5354
TDD/TTY telephone: Montana Relay 711
Fax: 406-444-0266
E-Mail: geoinfo@mt.gov

Resource description: Offline Data

Distribution liability:

Metadata Reference Information:

Metadata date: 08/13/2014

Metadata review date: 09/29/2004

Metadata review date: 11/12/1996

Metadata review date: 06/16/1999

Metadata contact:

Montana State Library
P.O. Box 201800
Helena, Montana 59620-1800
Telephone: 406-444-5354
TDD/TTY telephone: Montana Relay 711
Fax: 406-444-0266
E-Mail: geoinfo@mt.gov