USDA Natural Resources Conservation Service 19961112 map Helena, Montana Montana State Library The former name of this data set was "hd109" https://ftpgeoinfo.msl.mt.gov/Data/Spatial/MSDI/HydrologicUnits/Historic/Watershed_1999.zip https://mslservices.mt.gov/Geographic_Information/Data/DataList/datalist_Details.aspx?did={0077A7D3-F6C3-4D08-9837-410E79A12FCC} 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. 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. 1996 Publication Date -115.612144 -103.610588 49.0368729 44.2378769 -116.0748825073,49.02441787719,-116.0513381958,47.93949127197,-115.7472457885,47.45859146118,-114.6641998291,46.60823059082,-114.424659729,46.61886978149,-114.5483016967,45.60388565063,-114.3186950683,45.43321228027,-113.9458312988,45.58434677124,-113.5072631835,44.86284637451,-112.8395233154,44.31266784668,-110.9373550415,44.44471740722,-110.950553894,44.95633697509,-108.1549987793,44.98777389526,-103.8922653198,44.98892211914,-103.7473602294,49.05199050903,-109.5802764892,49.08559036254,-116.0748825073,49.02441787719 ISO 19115 Topic Category inlandWaters Hydrologic unit Watershed boundary Drainage basin Subbasin Sub basin Sub-Basin Montana None 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. Montana State Library mailing address

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Helena Montana 59620-1800 406-444-5354 Montana Relay 711 406-444-0266 geoinfo@mt.gov https://ftpgeoinfo.msl.mt.gov/Documents/Maps/Individual/19990616_485_1999_Watersheds5thCode.gif 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. 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). 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). 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. National Mapping Division U.S. Geological Survey map Reston, VA U.S. Geological Survey 100000 stable based media or paper 1950 1996 Publication Date Q100 These are the base maps upon which the watershed boundaries were drafted and digitized from. USDA Natural Resources Conservation Service Montana State Office 1996 map Bozeman, Montana USDA NRCS Montana State Office 100000 stable base media or paper 1996 Publication Date scs1 These are the watershed maps that were digitized. U.S. Department of Agriculture 19950601 other Washington, DC Natural Resources Conservation Service NRCS National Instruction 170-304 Available at http://www.nhq.nrcs.usda.gov/hu/intro.html text 19950601 Publication Date hdgu These are the NRCS national guidelines for mapping and digitizing watersheds that were followed in preparation of this data set. Idaho Department of Water Resources 1996 map Boise, Idaho Idaho Department of Water Resources 100000 electronic file 1996 Publication Date idwr This is the source of the 5th-Code watershed boundaries in Idaho. Draft watershed boundaries on base maps based on the stream network and contours shown on the base maps and based on field investigations. Q100 hdgu 1996 scs1 Digitize 1:100,000 scale hydrologic unit quadrangles in GRASS GIS. scs1 hdgu 1996 scs2 Project quads from UTM zone 11 and 13 into zone 12 and match all the edges scs2 1996 scs3 Verification of draft delineations by Montana NRCS field staff. scs3 19960401 scs4 Verification of draft delineations by U.S. Forest Service Region One field staff. scs4 19960901 scs5 Quality check digital data and hard copy plots. scs5 19961001 scs6 Convert data from GRASS to Arc/Info format at Montana State Library. scs6 19961003 scs7 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. scs7 idwr 19961101 scs8 changed coding of lines and polys between 17010101090 and 17010102040 per faxed transmittal from NRCS Bozeman at request of FWP knowledge of watershed character. 19990614 Vector Complete Chain 4028 GT-polygon composed of chains 889 State Plane Coordinate System 1983 2500 45 49 -109.5 44.25 600000.00000 0.00000 meters North American Datum of 1983 Geodetic Reference System 80 6378137 298.257 Watershed_1999 Feature Class FID Internal feature number. Shape Feature geometry. AREA Area of polygon in square meters PERIMETER Area of polygon in square meters HD109_ Internal feature number from original coverage version of the data HD109_ID User ID number from original coverage version of the data FIFTHCODE 5th-Code watershed Hydrologic Unit Code (HUC) number 10010001010 17010213140 FOURCODE 4th-Code sub-basin Hydrologic Unit Code (HUC) number 10010001 17010213 ACRES Area of 5th-Code watershed in acres 1477 284938 NAME Name of the 4th-code sub-basin that contains this 5th-code watershed Montana State Library mailing address

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Helena MT 59620-1800 406-444-5354 Montana Relay 711 406-444-0266 geoinfo@mt.gov Downloadable Data 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. 20140813 20040929 19961112 19990616 Montana State Library mailing address

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Helena Montana 59620-1800 406-444-5354 Montana Relay 711 406-444-0266 geoinfo@mt.gov FGDC Content Standards for Digital Geospatial Metadata FGDC-STD-001-1998 {6a37cfa0-2317-11e4-8c21-0800200c9a66}