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Surface Water Conditions in the Coconino Plateau Basin

Streamflow data, including average seasonal flow, average annual flow and other information are shown in Table 6.1-2.  Flood ALERT equipment in the basin is shown in Table 6.1-3.  Reservoir and stockpond data, including maximum storage or maximum surface area, are shown in Table 6.1-4. The location of streamflow gages identified by USGS number, flood ALERT equipment, USGS runoff contours and large reservoirs are shown on Figure 6.1-5.  Descriptions of stream, reservoir and stockpond data sources and methods are found in Volume 1, Appendix A.  Additional information on surface water in this basin can be found in Section 6.1.5 - Perennial/ Intermittent Streams and Springs and Section 6.0.2 - Surface Water Hydrology. Where available, the header for each section provides a link to the data web site.

Streamflow Data

  • Refer to Table 6.1-2.
  • Data from 12 stations located at eight watercourses are shown in the table and on Figure 6.1-5.  Six of the 12 stations have been discontinued and five of the six remaining stations are real-time stations.

  • Average seasonal flow is relatively similar in all seasons at more than half of the stations due to regulated flow on the Colorado River or proximity to springs.  Exceptions are, Moenkopi Wash near Cameron and Bright Angel Creek near Grand Canyon. 

  • The largest annual flow recorded in the basin is 15.97 million acre feet (maf) in 1997 at the Colorado River above Diamond Creek near Peach Springs station with a contributing drainage area of more than 149,000 square miles. 

  • Most streams in this basin have a mean and median annual flow of over 10,000 acre-feet.  The Colorado River and the Little Colorado River have a mean annual flow of over 100,000 acre-feet.

  • The main tributary to the Colorado River, the Little Colorado River has a mean annual flow of more than 162,000 acre-feet near Cameron. As shown on Figure 6.1-4, there is significant variability in year to year flow.

Flood ALERT Equipment

  • Refer to Table 6.1-3.
  • As of October 2005 there were two stations in the basin. 

Reservoirs and Stockponds

  • Refer to Table 6.1-4.
  • The basin contains 12 large reservoirs.  The largest is Dogtown with a maximum storage capacity of 1,390 acre-feet.

  • The most common use of the large reservoirs is for fire protection or as a stock or farm pond.  Dogtown, Kaibab and Cataract Reservoirs provide water supply for the City of Williams.

  • Half of the large reservoirs in this basin are either dry or intermittent lakes.

  • Surface water is stored or could be stored in 45 small reservoirs in the basin. 

  • There are 757 registered stockponds in this basin.

Runoff Contour

  • Refer to Figure 6.1-5.
  • Average annual runoff is highest, two inches per year or 106.6 acre-feet per square mile, in the southeastern portion of the basin and decreases to 0.1 inches, or 5.33 acre-feet per square mile, along most of the Colorado River.

 

 

Click to view Table 6.1-2

Click for Table 6.1-2 Streamflow Data for the

Coconino Plateau Basin

Click to view Figure 6.1-4

Click for Figure 6.1-4 Annual flows (acre-feet) at Little

Colorado River near Cameron, water years 1948-2006

(Station #9402000)

Click to view Table 6.1-3

Click for Table 6.1-3 Flood ALERT Equipment in the

Coconino Plateau Basin

Click to view Table 6.1-4

Click for Table 6.1-4 Reservoirs and Stockponds in the

Coconino Plateau Basin

Click to view Figure 6.1-5

Click for Figure 6.1-5 Coconino Plateau Basin

Surface Water Conditions

 

 

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