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Colorado River Basin Natural Flow and Salt Data
Supporting Data for Natural Flow Computation

Natural Flow & Salt Data Index
Natural Flow and Salt Data Home Page

Current Natural Flow and Salt Data
      Natural Flow Supporting Data
      Natural Salt Supporting Data

Previous Natural Flow and Salt Data

Upper Basin


  • The recent streamflow extension project supersedes data in the report below. Refer to the Extension report (will be released soon) in the Documentation section for a list of affected stream gauges.

  • A record of data used to compute natural flow from 1906-1971 in the Upper Basin was extracted from Microfiche. These records are available in an Excel format upon request from the Upper Colorado Regional Office. The official data for natural flow from 1906-1971 does not exactly match the Microfiche for 4 gauges (09124600, 09211200, 09328500, 09355500). These differences are documented in a June 2000 status report presented to the Technical Modeling Subcommittee of the Salinity Control Forum. Reclamation intends to explore and document the resolution of these differences in the near future.

Lower Basin

  • Lower Basin Decree Accounting and reservoir regulation data are stored in Reclamation's Lower Colorado Hydrologic Data Base. These data are available upon request from the Boulder Canyon Operations Office.

Contact: Water Operations Control Center
Updated: January 2015