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National Water Conditions

U.S. Geological Survey
Environment Canada Climate Information Branch





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

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