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Layer: usgs_rivermiles (ID:0)

View In:   Map Viewer

Name: usgs_rivermiles

Display Field: RIVER_NM

Type: Feature Layer

Geometry Type: esriGeometryPoint

Description: This freature class is a vector representation of the USGS river mile locations depicted on the 7.5 minute (1:24k) quadrangle series covering the Upper Columbia River from Grand Coulee Dam (RM 597) to the US/Canada border (RM 745). It was digitized on 14 July 2015 using the ESRI USA_Topo_Maps basemap (Copyright:© 2013 National Geographic Society, i-cubed), cross-checked with historical USGS quadrangle GeoTIFFs downloaded from the USGS Historical Quadrangle Scanning Project.As a general point, be aware that even though they are called "river miles", they are only approximately one mile apart from each other. The average distance between points (following the NHDS Columbia River centerline) is 5,441 ft (1.03 mi), and distances range from 3,665 ft (0.69 mi) to 8,898 ft (1.69 mi). The most likely reason for is that it is a measurement error inherent in the methodology used by the USGS to mark the river miles. They should be considered and used as index markers only, and cannot be used as an actual basis for measurement.At RM 690, the index numbering jumps from 690 to 692, skipping RM 691. This occurs where the Columbia River crosses from one the Rice to Bangs Mountain quadrangle sheet, and appears to just be a numbering error that has been propagated on all current and historical quadrangle maps north of this point. The "MILE_NR" field is consistent with the USGS designations and omits RM 691; the "MILE_ACTUAL" field renumbers the river mile designations starting with RM 691, ending with RM 744, should you have a need for them.In the 1992 edition of the Rice quadrangle, someone at the USGS attempted to adjust for the missing RM 691 by remeasuring and renumbering the river miles from the north of the quadrangle, but the end result was that RM 681 was skipped instead, and furthermore RM 682 was only ~0.5 mi from RM 680. This decision was reversed in the 1996 edition. However, Washington State Department of Ecology created the GIS statewide river mile point layer in March 2007 by digitizing the river mile points depicted on the USGS 7½ minute (24k) topographic quadrangle maps, and in doing so they used the 1992 edition of the RIce quadrangle, incorporating the temporary adjustment. This discrepancy in the Rice quadrangle RM designations has not been corrected in the publicly-available Ecology statewide river mile shapefile as of this writing.

Copyright Text: Windward Environmental LLC

Min. Scale: 0

Max. Scale: 0

Default Visibility: true

Max Record Count: 2000

Supported query Formats: JSON, geoJSON, PBF

Use Standardized Queries: True

Extent:

Drawing Info:

HasZ: false

HasM: false

Has Attachments: false

Has Geometry Properties: false

HTML Popup Type: esriServerHTMLPopupTypeAsHTMLText

Object ID Field: FID

Unique ID Field:

Global ID Field:

Type ID Field:

Fields:
Templates:

Is Data Versioned: false

Has Contingent Values: false

Supports Rollback On Failure Parameter: true

Last Edit Date: 9/17/2024 5:13:22 PM

Schema Last Edit Date: 9/17/2024 5:13:22 PM

Data Last Edit Date: 9/17/2024 5:13:22 PM

Supported Operations:   Query   Query Pivot   Query Top Features   Query Analytic   Query Bins   Generate Renderer   Validate SQL   Get Estimates   ConvertFormat