USGS logo


National Water Conditions

U.S. Geological Survey
Environment Canada Climate Information Branch




STATION NAME: ST. LAWRENCE R AT CORNWALL ONT NR MASSENDRAINAGE AREA STATION NUMBER: 04264331 STATE: NEW YORK COUNTY: ST LAWRENCE

STATISTICAL SUMMARY OF SELECTED WATER QUALITY DATA COLLECTED FROM APR 1955 TO AUG 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 MEASURMENTS 00061 DISCHARGE, INST. CFS 76 340000.000 26000.000 281710.500 330000.000 307250.000 287000.000 268500.000 225100.000 00095 SPECIFIC CONDUCT US/CM @ 25C 180 400.000 250.000 318.367 368.000 330.000 320.000 300.000 285.100 00010 WATER TEMPERATUR (DEGREES) 195 26.000 0.000 10.997 22.000 18.500 11.000 2.000 0.500 00400 PH, WH, FIELD (STANDARD UNIT 194 9.100 6.500 7.936 8.600 8.200 8.000 7.700 7.300 00410 ALKALINITY,WH,FE (MG/L AS CACO3 109 141.000 77.000 90.514 98.000 93.000 90.000 88.000 82.000 00453 BICARBONATE,DIS, (MG/L AS HCO3) 24 124.000 102.000 112.292 123.250 114.750 112.000 109.250 102.500 39086 ALKALINITY,DIS,I (MG/L AS CACO3 28 118.000 86.000 93.536 110.800 94.750 93.000 91.000 86.900 00300 OXYGEN DISSOLVED (MG/L) 157 14.800 6.400 10.543 14.120 11.800 10.400 9.000 7.790 00301 OXYGEN DIS. PERC % OF SATURATIO 150 130.000 63.000 93.827 109.900 100.000 96.000 87.750 76.000 BACTERIA 31625 COLIFORM FECAL 0 COLS./100 ML 122 2500.000 0.000 27.852 27.850 8.000 4.000 2.000 1.000 31673 FECAL STRPT KF A COLS./100 ML 121 200.000 <1.000 10.120* 42.000 8.000 2.000 <1.000 <1.000 NUTRIENTS 00631 NO2 + NO3 DISSOL (MG/L AS N) 85 0.720 0.100 0.238 0.430 0.300 0.230 0.160 0.110 00608 NITROGEN AMMONIA (MG/L AS N) 84 0.310 <0.010 0.037* 0.150 0.040 0.020 <0.010 <0.010 00613 NITROGEN,NITRITE MG/L AS N 36 0.030 <0.010 0.007* 0.030 <0.010 <0.010 <0.010 <0.010 00671 PHOSPHORUS ORTHO (MG/L AS P) 77 0.020 <0.010 0.005* 0.020 <0.010 <0.010 <0.010 <0.010 00666 PHOSPHORUS DISS. (MG/L AS P) 105 0.070 <0.010 0.013* 0.040 0.010 0.010 <0.010 <0.010 00625 NITROGEN A+O TOT. (MG/L AS N) 171 1.300 <0.100 0.350* 0.600 0.400 0.310 0.240 <0.200 00665 PHOSPHORUS TOTAL (MG/L AS P) 170 2.000 <0.010 0.034* 0.050 0.030 0.020 0.010 <0.010 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

Return to the U.S. Geological Survey National Water Conditions Water Quality Tables