STATION NAME:  COLORADO RIVER AT LEES FERRY
STATION NUMBER:  09380000  
STATE: ARIZONA                    
COUNTY: COCONINO
                 


               STATISTICAL SUMMARY OF SELECTED WATER QUALITY DATA COLLECTED FROM JAN  1926 TO  SEPT  1994


                                                                                         PERCENT OF SAMPLES IN WHICH VALUES
                                               DESCRIPTIVE STATISTICS                 WERE LESS THAN OR EQUAL TO THOSE SHOWN
 ------------------------------------- --------------------------------------  ------------------------------------------------------
                                       SAMPLE                                                          (MEDIAN)
     #WATER-QUALITY CONSTITUENT         SIZE    MAXIMUM    MINIMUM       MEAN      95 %       75 %       50 %       25 %        5 %
 ------------------------------------- --------------------------------------  ------------------------------------------------------
 FIELD MEASUREMENTS

 00061 DISCHARGE, INST. CFS              471 115000.000   1680.000  19009.234   68700.078  21400.000  12900.000   8360.000   4430.000
 00095 SPECIFIC CONDUCT US/CM @ 25C     1008   2430.000    360.000   1090.446    1710.000   1430.000    985.000    800.000    493.450
 00010 WATER TEMPERATUR (DEGREES)        422     27.000      0.000     10.724      20.000     12.000      9.500      8.000      7.000
 00400 PH, WH, FIELD    (STANDARD UNIT   897      8.800      6.500      7.778       8.200      7.950      7.800      7.600      7.400
 00410 ALKALINITY,WH,FE (MG/L AS CACO3   522    340.000     89.000    142.536     194.000    156.000    136.000    126.000    103.150
 00453 BICARBONATE,DIS, (MG/L AS HCO3)    68    182.000    131.000    164.309     178.000    170.750    165.000    160.000    146.350
 39086 ALKALINITY,DIS,I (MG/L AS CACO3    68    149.000    107.000    134.647     146.000    139.750    135.000    131.000    119.900
 00300 OXYGEN DISSOLVED (MG/L)           159     12.800      6.000      8.573      10.400      9.200      8.500      7.900      6.800
 00301 OXYGEN DIS. PERC % OF SATURATIO    99    122.000     64.000     83.394     100.000     87.000     83.000     77.000     73.000

 BACTERIA

 31625 COLIFORM FECAL 0 COLS./100 ML     136     36.000     <1.000      1.556*      4.000      1.000     <1.000     <1.000     <1.000
 31673 FECAL STRPT KF A COLS./100 ML     132   1000.000     <1.000     17.443*     36.000      4.000      1.000     <1.000     <1.000

 NUTRIENTS

 00631 NO2 + NO3 DISSOL (MG/L AS N)      246      1.300      0.000      0.431       0.753      0.510      0.397      0.331      0.184
 00608 NITROGEN AMMONIA (MG/L AS N)      162      0.230     <0.002      0.027*      0.100      0.030      0.016     <0.060     <0.010
 00613 NITROGEN,NITRITE MG/L AS N        105      0.020     <0.010      0.005*      0.010     <0.010     <0.010     <0.010     <0.010
 00671 PHOSPHORUS ORTHO (MG/L AS P)      215      0.800     <0.001      0.015*      0.030      0.010     <0.010     <0.010     <0.001
 00666 PHOSPHORUS DISS. (MG/L AS P)      132      0.090     <0.010      0.014*      0.040      0.020      0.010     <0.010     <0.010
 00625 NITROGEN A+O TOT. (MG/L AS N)      235      1.200     <0.100      0.370*      0.850      0.450      0.300      0.200     <0.200
 00665 PHOSPHORUS TOTAL (MG/L AS P)      241      0.230     <0.001      0.013*      0.040      0.020      0.010     <0.010     <0.001

                                                                                                                         
 CFS          = CUBIC FEET PER SECOND                                 A+O          = AMMONIA PLUS ORGANIC
 US/CM @ 25C  = MICROSEIMENS PER CENTIMETER AT 25 DEGREES CELSIUS     N            = NITROGEN
 MG/L         = MILLIGRAMS PER LITER                                  NO2          = NITRITE
 CACO3        = CALCIUM CARBONATE                                     NO3          = NITRATE
 HCO3         = BICARBONATE                                           P            = PHOSPHORUS
 COLS./100 ML = COLONIES PER 100 MILLILITER                          
 %            = PERCENT                                              
 <            = LESS THAN



 Unless otherwise noted, all nutrients results are from filtered samples.

 *VALUE IS ESTIMATED BY USING A LOG-PROBABILITY REGRESSION
 #TO SEE COMPLETE NAME OF CONSTITUENTS, CLICK ON HIGHLIGHTED TEXT ABOVE