Curran, Janet H. (ORCID: 0000-0002-3899-6275) 20240518 vector and tabular digital data Anchorage, Alaska U.S. Geological Survey, Alaska Science Center Suggested Citation: Curran, J.H., 2024, Selected basin boundaries for USGS streamgages in Alaska through 2019: U.S. Geological Survey data release, https://doi.org/10.5066/P13TMJUP https://doi.org/10.5066/P13TMJUP This dataset contains drainage basin boundaries for 253 U.S. Geological Survey (USGS) streamgages in Alaska that had at least 5 years of daily streamflow through September 30, 2017, three of which were delineated for alternate basin conditions. This compilation includes selected boundaries produced in 2014 (https://doi.org/10.5066/P143KNEJ). Additional basin boundaries were delineated from the streamgage location to the nearest USGS Watershed Boundary Dataset (WBD) HUC boundary and along HUC boundaries from that intersection to the basin headwaters. Streamgages selected for drainage basin delineation included streamgages in Alaska that met selection criteria for a statewide study of seasonal flow regimes (Curran and Biles, 2021). Sites for that study included USGS streamgages that had at least 5 years of daily streamflow that responded mostly to seasonal meteorological inputs, that had a definable drainage basin above a minimum size from which basin characteristics could be determined, and that provided streamflow data not similar to another streamgage record in the dataset. For three streamgages, the drainage basin boundary was delineated for the drainage area associated with regulated (diverted) or unregulated streamflow conditions contemporaneous with a period of streamflow record other than the present. Selected basins were previously published in the WBD as "NWISDrainageArea" features. The drainage basin boundaries were developed to represent drainage basins for selected USGS streamgages in Alaska for the purpose of obtaining basin characteristics for a statewide study of seasonal flow regimes (Curran and Biles, 2021). 2019 data process date Complete None planned -171.7383 -125.5078 70.2000 52.2682 USGS Metadata Identifier USGS:66440948d34e1955f5a427ff ISO 19115 Topic Category InlandWaters NASA GCMD Earth Science Keyword Thesaurus Terrestrial Hydrosphere Rivers/streams Discharge/flow USGS Thesaurus Hydrographic datasets Hydrology USGS Geographic Names Information System (GNIS) Alaska No access constraints. No use constraints. We request that the suggested citation of this USGS data release be included in any publications that reference or utilize these data. U.S. Geological Survey, Alaska Science Center Mailing and Physical

4210 University Drive

Anchorage Alaska 99508 USA 907-786-7000 gs-ak_asc_datamanagers@usgs.gov Curran, J.H. Biles, F.E. 2020 vector and tabular digital data online U.S. Geological Survey, Alaska Science Center Curran, J.H. and Biles, F.E., 2020, Streamgage attributes, basin characteristics, and seasonal flow regimes, selected streamgages in Alaska, 1914-2017: U.S. Geological Survey data release, https://doi.org/10.5066/P90K2Y4R https://doi.org/10.5066/P90K2Y4R All digitized drainage boundaries and attributes were reviewed for errors. Attribute values fall within expected ranges. Drainage basins in this data release are for streamgages included in Curran and Biles (2021). Data set is considered complete for the information presented, as described in the abstract. Users are advised to read the rest of the metadata record carefully for additional details. A formal accuracy assessment of the horizontal positional information in the data set has not been conducted. U.S. Geological Survey 2019 vector digital data online U.S. Geological Survey Three data products of the USGS The National Map: (1) National Hydrography Dataset, (2) Watershed Boundary Dataset, (3) Topographic Data Product [accessed 2019] https://apps.nationalmap.gov/downloader/ https://www.usgs.gov/national-hydrography/national-hydrography-dataset https://www.usgs.gov/national-hydrography/watershed-boundary-dataset online database 2019 data access date USGS The National Map This product was used to inform basin delineations. Natural Resources Canada 2019 vector digital data online Natural Resources Canada Natural Resources Canada Topographic Maps. 1:50,000 topographic maps [accessed 2019] https://natural-resources.canada.ca/science-and-data/science-and-research/geomatics/topographic-tools-and-data/10785 online data 2019 data access date GeoGratis This product was used to inform basin delineations. U.S. Geological Survey, National Water Information System (NWIS) 2019 online database Reston, VA U.S. Geological Survey U.S. Geological Survey, 2019, U.S. Geological Survey National Water Information System database, https://doi.org/10.5066/F7P55KJN [accessed 2019] https://doi.org/10.5066/F7P55KJN online database 2019 access date NWIS Computed drainage areas were used to update drainage area in NWIS. Curran, J.H. 2024 vector and tabular digital data Anchorage, Alaska U.S. Geological Survey, Alaska Science Center Curran, J.H., 2024, Selected basin boundaries for USGS streamgages in Alaska through 2014: U.S. Geological Survey data release, https://doi.org/10.5066/P143KNEJ https://doi.org/10.5066/P143KNEJ online database 2014 data process date Curran 2024 Drainage basins for selected USGS streamgages in Alaska produced in 2014. Selected streamgage drainage basin boundaries produced in 2014 (https://doi.org/10.5066/P143KNEJ) are included in the dataset (distinguished by the 'EditYear' and 'OrigPub' attributes). For additional streamgages delineated in 2019, the streamgage location was snapped to the nearest flowline of the NHD (USGS The National Map). Basin boundaries were digitized on-screen from the snapped streamgage location to the nearest HUC boundary using digital topographic maps, supplemented with available imagery, lidar topographic data, or field notes in topographic settings difficult to interpret or subject to rapid change, such as low-lying areas, the terminus of retreating glaciers, or urban areas. Topographic data used included USGS 1:63,360 topographic maps (USGS The National Map) and Natural Resources Canada 1:50,000 topographic maps (GeoGratis). HUC boundaries were followed to the headwaters of the basin to form the rest of the boundary. The basin boundaries were consistent with HUC boundaries at the time of editing (2019) and have not been adjusted for subsequent HUC boundary updates. Drainage area in square miles and in square kilometers were computed from the basin boundaries. After resolving any large discrepancies from existing values in the National Water Information System (NWIS), the computed drainage areas were used to update drainage area in NWIS. 2019 LITERATURE CITED: Curran, J.H., Barth, N.A., Veilleux, A.G., Ourso, R.T., 2016. Estimating flood magnitude and frequency at gaged and ungaged sites on streams in Alaska and conterminous basins in Canada, based on data through water year 2012: U.S. Geological Survey Scientific Investigations Report 2016-5024 https://doi.org/10.3133/sir20165024 Curran, J.H., Biles, F.E., 2021, Identification of seasonal streamflow regimes and streamflow drivers for daily and peak flows in Alaska. Water Resources Research 57(2):e2020WR028425 https://doi.org/10.1029/2020WR028425 Unknown U.S. Geological Survey streamgage station names and numbers refer to specific geographic locations recorded in the NWIS database. Vector G-polygon 253 Albers Conical Equal Area 55.0 65.0 -154.0 50.0 0.0 0.0 coordinate pair 0.6096 0.6096 meters North American Datum 1983 (NAD83) Geodetic Reference System 1980 (GRS80) 6378137 298.257222101 USGS_AK_GageBasinDA_SFR2020.shp Vector polygon geospatial file of basin boundaries at streamgages in Alaska. Presented in Esri shapefile (SHP) format. Author defined FID Internal feature number ESRI Sequential unique whole numbers that are automatically generated. Shape Feature geometry ESRI Shape type UniqSiteID Unique Identifier for each record: Combination of Site Number and any special conditions for the given basin. Author defined Unique Identifier for each record SiteNumber Unique Identifier for each site: an 8 to 15 digit number of the USGS site. NWIS Unique Identifier for each site: an 8 to 15 digit number of the USGS site. StationNm Unique Identifier: a name consisting of the stream name and location. NWIS Unique Identifier: a name consisting of the stream name and location. SpecConds Description: Definition of contributing drainage area delineation condition. Blank cells indicate unmodified basin boundaries without any special conditions. Author defined regulated Basin boundary modified to match the contributing area for the regulated condition. Author defined unregulated Basin boundary modified to match the contributing area for the unregulated condition. Author defined AreaSqMi Drainage Area: area that drains to a point on the stream (calculated in square miles). Author defined 0.37877224229 111565.660031 Square Miles AreaSqKm Drainage Area: area that drains to a point on the stream (calculated in square kilometers). Author defined 0.981015603928 288953.732965 Square Kilometers EditYear Description: Year the given drainage basin boundary was last edited Author defined 2014 2019 Year (YYYY) OrigPub Digital Object Identifier (DOI) of USGS data release in which the basin boundary was first published. Author defined P143KNEJ Selected basin boundaries for USGS streamgages in Alaska through 2014, https://doi.org/10.5066/P143KNEJ Author defined P13TMJUP Selected basin boundaries for USGS streamgages in Alaska through 2019 (this data release), https://doi.org/10.5066/P13TMJUP Author defined contributors_2019.csv Table with the names, affiliation, and contribution to the data collection and processing. Presented in a Comma Separated Value (CSV) formatted table. Author defined Name Name of the contributor. Author defined Name of the contributor. Affiliation Name of contributor's employer. Author defined USGS ASC U.S. Geological Survey - Alaska Science Center Author defined USGS UWSC U.S. Geological Survey - Utah Science Center Author defined USDA FS PNRS U.S.D.A. Forest Service - Pacific Northwest Research Station Author defined ORCID Open Researcher and Contributor ID (ORCID), a unique, persistent identifier. ORCID A 16-digit identifier, shown with a hyphen inserted every 4 digits of the identifier. When preceded by "https://orcid.org/", the identifier forms a link to the online ORCID record. Years Years of contribution to data collection and processing. Author defined Years of contribution to data collection and processing. Contribution Note about the contribution to data collection and processing. Author defined Note about the contribution to data collection and processing. Cross reference Citation reference to reports supported by the contributor's effort. Author defined Citation reference to reports supported by the contributor's effort. U.S. Geological Survey USGS ScienceBase Team Mailing and Physical

Denver Federal Center, Building 810, Mail Stop 302

Denver Colorado 80225 USA 1-888-275-8747 sciencebase@usgs.gov The U.S. Geological Survey, Alaska Science Center is the authoritative source of these data, distributed by ScienceBase (a USGS Trusted Digital Repository). Unless otherwise stated, all data, metadata and related materials are considered to satisfy the quality standards relative to the purpose for which the data were collected. Although these data and associated metadata have been reviewed for accuracy and completeness and approved for release by the U.S. Geological Survey, no warranty expressed or implied is made regarding the display or utility of the data for other purposes or on all computer systems, nor shall the act of distribution constitute any such warranty. Any use of trade, firm, or product names is for descriptive purposes only and does not imply endorsement by the U.S. Government. CSV, SHP Geospatial data in SHP format; tabular data in CSV format; FGDC metadata in XML and HTML formats. Note: Drainage basins in this dataset larger than about 9800 square miles (25,000 square kilometers) have polygons with a large number of vertices (points along the edge of the polygon) and might not display correctly or at all in software with limitations on the number of vertices. https://doi.org/10.5066/P13TMJUP None 20240518 U.S. Geological Survey, Alaska Science Center Mailing and Physical

4210 University Drive

Anchorage Alaska 99508 USA 907-786-7000 gs-ak_asc_datamanagers@usgs.gov FGDC Content Standard for Digital Geospatial Metadata (CSDGM) FGDC-STD-001-1998