Service Description: These data have been modified from the original USGS NHD to include attributes relevant to the identification of groundwater-dependent rivers and streams in Oregon. Groundwater dependence of rivers is assessed using five indicator datasets; perennial flow, 'Super Stable Groundwater', gaining reaches, reaches with contributing springs, and streams with baseflow index greater than 0.5. Multiple indicators of groundwater-dependence can increase confidence that the river is a GDE. Rivers with the highest confidence were predominantly found in the more arid east side of the state.
Service ItemId: 145f83aab1cb4e89a71d2aed1f15890e
Has Versioned Data: false
Max Record Count: 2000
Supported query Formats: JSON
Supports applyEdits with GlobalIds: False
Supports Shared Templates: True
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Description: This dataset represents the extent and approximate location of rivers and streams in the state of Oregon with some likelihood of groundwater dependence. Indicators of groundwater dependence for these rivers and streams include:
Perennial flowing natural stream (defined as "FCODE" = 46006).
Reaches identified as "Super Stable Groundwater" by McManamay and DeRolph (2019),
Reaches identified by field measurements, including seepage runs, to be gaining reaches (references),
Reaches with at least one mapped spring within 100 meters upslope of the channel, and
Unregulated reach networks draining into USGS stream gages with continuous discharge data (NWIS, 2021) that have > 0.50 baseflow index.
Each of these indicators is attributed to the flowline as well as the sum of indicators present per line segment.
Streams: National Hydrologic Dataset
Super Stable Groundwater Reaches: McManamay and
DeRolph, 2019
Stream Base Flow: GAGES-II (Falcone et al. 2010)
Springs: DOGAMI and TNC
Gaining Reaches: Gannett et al 2007; Gannett et al.
2017; Lee 2011; Lee and Snyder 2009; Conlon et al.
2005; Herrera et al 2017
Spatial Reference: 102100 (3857)
Initial Extent:
XMin: -13912640.4446449
YMin: 5091151.34344412
XMax: -12918427.6932551
YMax: 5886521.54455589
Spatial Reference: 102100 (3857)
Full Extent:
XMin: -13866233.5574
YMin: 5159768.3061
XMax: -12964834.5805
YMax: 5817904.5819
Spatial Reference: 102100 (3857)
Units: esriMeters
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