Colorado River Basin Natural Flow and Salt Data
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This information has been updated; please see the Colorado River Current Natural Flow and Salt Data page for the most recent data.
NOTE: Several of these files are extremely large, and are best accessed by downloading before reading. To do so, "right click" on the link and select "Save Target As" to save the file to your hard drive. Presently the consumptive uses and losses data from 2006-2017 used to compute natural flow are PROVISIONAL and will be revised in the future. These revisions will change the natural flow computation. |
Natural Flow and Salt Data Index Current Natural Flow and Salt DataDocumentation Natural Flow Supporting Data Natural Salt Supporting Data Previous Natural Flow and Salt Data Provisional Natural Flow Data |
Contact: bcoowaterops@usbr.gov
1906-2019
PREVIOUS natural flow data 1906-2019 (Excel file, 1.5 MB) - Updated 4/20/21
Upper Basin: CSU extensions and MHYDRO 1906-1970 combined with recompiled CFelleter 1971-2019
Lower Basin: CSU extensions and March 1992 Reclamation report 1906-1970 combined with recompiled CFelleter 1971-2019PREVIOUS natural flow data 1906-2018 (Excel file, 1.5 MB) - Updated 1/10/20
Upper Basin: CSU extensions and MHYDRO 1906-1970 combined with recompiled CFelleter 1971-2018
Lower Basin: CSU extensions and March 1992 Reclamation report 1906-1970 combined with recompiled JShirey 1971-2018PREVIOUS natural flow data 1906-2017 (Excel file, 1.5 MB) - Updated 3/18/19
Upper Basin: CSU extensions and MHYDRO 1906-1970 combined with recompiled CFelleter 1971-2017
Lower Basin: CSU extensions and March 1992 Reclamation report 1906-1970 combined with recompiled JShirey 1971-2017PREVIOUS natural flow data 1906-2016 (Excel file, 1.5 MB) - Updated 9/28/18
Upper Basin: CSU extensions and MHYDRO 1906-1970 combined with recompiled CFelleter 1971-2016
Lower Basin: CSU extensions and March 1992 Reclamation report 1906-1970 combined with recompiled JShirey 1971-2016PREVIOUS natural flow data 1906-2014 (Excel file, 1.4 MB) - Updated 9/20/16
Upper Basin: CSU extensions and MHYDRO 1906-1970 combined with recompiled JPrairie 1971-2014
Lower Basin: CSU extensions and March 1992 Reclamation report 1906-1970 combined with recompiled JShirey 1971-2014PREVIOUS natural flow data 1906-2012 (Excel file, 1.6 MB) - Updated 1/8/15
Upper Basin: CSU extensions and MHYDRO 1906-1970 combined with recompiled JPrairie 1971-2012
Lower Basin: CSU extensions and March 1992 Reclamation report 1906-1970 combined with recompiled RButler 1971-2012PREVIOUS natural flow data 1906-2010 (Excel file, 1.6 MB) - Updated 4/2/13
Upper Basin: CSU extensions and MHYDRO 1906-1970 combined with recompiled JPrairie 1971-2010
Lower Basin: CSU extensions and March 1992 Reclamation report 1906-1970 combined with recompiled RButler 1971-2010PREVIOUS natural flow data 1906-2008 (Excel file, 1.3 MB) - Updated 1/26/11
Upper Basin: CSU extensions and MHYDRO 1906-1970 combined with recompiled JPrairie 1971-2008
Lower Basin: CSU extensions and March 1992 Reclamation report 1906-1970 combined with recompiled RCallejo 1971-2008
PREVIOUS natural flow data 1906-2007 (Excel file, 2.8 MB) - Updated 9/16/09
Upper Basin: CSU extensions and MHYDRO 1906-1970 combined with recompiled JPrairie 1971-2007
Lower Basin: CSU extensions and March 1992 Reclamation report 1906-1970 combined with recompiled RCallejo 1971-2007
PREVIOUS natural flow data 1906-2006 (Excel file, 2.8 MB) - Updated 6/16/08
Upper Basin: CSU extensions and MHYDRO 1906-1970 combined with recompiled JPrairie 1971-2005
Lower Basin: CSU extensions and March 1992 Reclamation report 1906-1970 combined with recompiled RCallejo 1971-2005
1971-2005 flow data revisions (PDF file, 12 KB) resulting from changes identified during update through 2006
1971-2004 flow data revisions (PDF file, 12 KB) resulting from changes identified during update through 2005
1971-2003 flow data revisions (PDF file, 12 KB) resulting from changes identified during update through 2004
1906-2005
PREVIOUS natural flow data 1906-2005 (Excel file, 2.7 MB) - Updated 6/22/07
(NOTE: **Data Used for Shortage FEIS and Triennial Review**)
Upper Basin: CSU extensions and MHYDRO 1906-1970 combined with recompiled JPrairie 1971-2005
Lower Basin: CSU extensions and March 1992 Reclamation report 1906-1970 combined with recompiled RCallejo 1971-2005
PREVIOUS natural salt mass data 1906-2005 (Excel file, 2.2 MB) - Updated 8/8/07
(NOTE: **Data Used for Triennial Review 2008**)
Upper Basin: Direct from regression based on 1971-2005 data
Lower Basin: 1906-1970 direct from regression based on 1971-2005 data combined with recompiled RCallejo 1971-2005
PREVIOUS natural salt concentration data 1906-2005 (Excel file, 1.5 MB) - Updated 8/8/07
(NOTE: **Data Used for Triennial Review 2008**)
Upper Basin: Direct from regression based on 1971-2005 data
Lower Basin: 1906-1970 direct from regression based on 1971-2005 data combined with recompiled RCallejo 1971-2005
Shortage FEIS natural salt mass data 1906-2005 (Excel file, 2.2 MB) - Updated 6/22/07
(NOTE: **Data Used for Shortage FEIS**)
Upper Basin: Direct from regression based on 1971-1995 data
Lower Basin: 1906-1970 direct from regression based on 1971-2005 data combined with recompiled RCallejo 1971-2005
Shortage FEIS natural salt concentration data 1906-2005 (Excel file, 1.5 MB) - Updated 6/22/07
(NOTE: **Data Used for Shortage FEIS**)
Upper Basin: Direct from regression based on 1971-1995 data
Lower Basin: 1906-1970 direct from regression based on 1971-2005 data combined with recompiled RCallejo 1971-2005
1906-2004
PREVIOUS naturalflow data 1906-2004 (Excel, 2.7 MB) - Updated 10/13/06
Upper Basin: MHYDRO 1906-1970 combined with recompiled JPrairie 1971-2004
Lower Basin: March 1992 Reclamation report 1906-1970 combined with recompiled RCallejo 1971-2004
PREVIOUS natural salt mass data 1906-2004 (Excel, 2.1 MB) - Updated 10/13/06
Upper Basin: Direct from regression based on 1971-1995 data
Lower Basin: 1906-1970 direct from regression based on 1971-2004 data combined with recompiled RCallejo 1971-2004
PREVIOUS natural salt concentration data 1906-2004 (Excel, 1.5 MB) - Updated 10/13/06
Upper Basin: Direct from regression based on 1971-1995 data
Lower Basin: 1906-1970 direct from regression based on 1971-2004 data combined with recompiled RCallejo 1971-2004
1906-2003
PREVIOUS natural flow data 1906-2003 (Excel, 2.7 MB) - Updated 9/23/05
Upper Basin: MHYDRO 1906-1970 combined with recompiled JPrairie 1971-2003
Lower Basin: March 1992 Reclamation report 1906-1970 combined with recompiled RCallejo 1971-2003
1971-1995 corrections (PDF, 15 KB) resulting from problems identified during update through 2003.
1906-1995
PREVIOUS natural flow data CY1906-1995 (Excel, 2.1 MB) - Updated 9/7/04
Upper Basin: MHYDRO 1906-1970 combined with recompiled JPrairie 1971-1995
Lower Basin: MHYDRO 1906-1970 combined with recompiled RCallejo 1971-1995
PREVIOUS natural salt mass data CY1906-1995 (Excel, 1.9 MB) - Updated 9/7/04
Upper Basin: Direct from regression based on 1971-1995 data
Lower Basin: MHYDRO 1906-1970 combined with recompiled RCallejo 1971-1995
PREVIOUS natural salt concentration data CY1906-1995 (Excel, 1.4 MB) - Updated 9/7/04
Upper Basin: Direct from regression based on 1971-1995 data
Lower Basin: MHYDRO 1906-1970 combined with recompiled RCallejo 1971-1995
Last Updated: 15NOV2022
