Old Colorado Almanac - page 21
geography/environment - continued

 

 

Colorado Geologic Map Map of uplifts and sedimentary basins in Colorado
                 Click map for large view

Geologic map of Colorado (shows age of rocks at ground surface)

Click to enlarge

 

 

 

Map of annual river flows in Colorado in acre-feet of water.  (An acre-foot is 326,000 gallons, enough to supply 4 people for 1 year.)

This map is current to about 1965, and generally represents today's flows.  A modern version of this map can be viewed at the Colorado Water Resources Division.

The Colorado River is the largest river in the state, and the Yampa River is second largest.

Notice how the Arkansas River and the Rio Grande River have slightly smaller flows in their downstream portions due to irrigation withdrawals.

 

 

 

 

Minerals, sand/gravel, stone  Annual summaries of production and value 1994 -2003

 

 

 

. . . on to page 22 of the Almanac

  back to page 20

 

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