Historical Annual Runoff


Click here to download a PDF of the Historical Annual Colorado River Runoff diagram

  • Annual totals by water year (Oct 1 – Sep 30).
  • Most recent water year data may be provisional.
  • Years with incomplete gauge data have been omitted.
  • Annual runoff totals are in units of 1000 Acre-Feet.

Graphs are interactive, hovering over data will show the runoff values.

Colorado Water Supply Outlook

The Natural Resource Conservation Service water supply outlook, as of May 1, 2021, contains the following estimates of runoff for the May through July 2021 period at the following gauges (Note: Not all gauges shown for historical runoff are forecasted, in which case a representative gauge from the outlook report was chosen):

Division River May - July Forecasted Runoff (1000 AF) % of 30 yr avg
1 South Platte River at South Platte 119 76%
2 Arkansas River above Pueblo 230 70%
3 Rio Grande River at Thirty Mile Bridge 64 60%
4 Gunnison River near Grand Junction 480 38%
5 Colorado River near Dotsero 675 53%
6 Yampa River near Maybell 325 41%
7 Animas River at Durango 150 41%

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COLORADO HISTORICAL ANNUAL RUNOFF CLICK HERE TO VIEW