STATION NAME:  WILLAMETTE RIVER AT PORTLAND 
STATION NUMBER:  14211720       
STATE: OREGON                     
COUNTY: MULTNOMAH
                           


               STATISTICAL SUMMARY OF SELECTED WATER QUALITY DATA COLLECTED FROM OCT  1974 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 MEASUREMENTS

 00061 DISCHARGE, INST. CFS               51 106000.000   7500.000  31100.785   84200.016  42100.000  21300.000  12600.000   7802.000
 00095 SPECIFIC CONDUCT US/CM @ 25C      168    105.000     42.000     75.190      97.550     85.000     74.000     64.000     54.000
 00010 WATER TEMPERATUR (DEGREES)        168     24.000      3.500     12.824      22.000     18.500     12.000      8.000      5.500
 00400 PH, WH, FIELD    (STANDARD UNIT   168      8.500      5.000      7.327       7.855      7.600      7.400      7.100      6.745
 00410 ALKALINITY,WH,FE (MG/L AS CACO3   118     36.000     14.000     23.653      30.050     26.000     24.000     21.000     15.900
 00453 BICARBONATE,DIS, (MG/L AS HCO3)    53     44.000     21.000     30.830      39.000     35.500     30.000     26.000     23.000
 39086 ALKALINITY,DIS,I (MG/L AS CACO3    50     36.000     17.000     25.160      32.000     29.000     25.000     21.750     19.000
 00300 OXYGEN DISSOLVED (MG/L)           155     16.000      6.500     10.648      13.700     12.400     10.700      8.900      7.480
 00301 OXYGEN DIS. PERC % OF SATURATIO    77    114.000     77.000     97.364     109.100    103.500     99.000     91.500     82.000

 BACTERIA

 31625 COLIFORM FECAL 0 COLS./100 ML     127   5000.000      0.000    367.906    1780.005    320.000    130.000     53.000     16.800
 31673 FECAL STRPT KF A COLS./100 ML     128   2900.000      1.000    194.781     881.500    180.000     46.000     15.250      3.450

 NUTRIENTS

 00631 NO2 + NO3 DISSOL (MG/L AS N)      108      1.400      0.160      0.504       1.100      0.648      0.415      0.290      0.200
 00608 NITROGEN AMMONIA (MG/L AS N)      107      0.260      0.000      0.078       0.172      0.100      0.070      0.050      0.010
 00613 NITROGEN,NITRITE MG/L AS N         62      0.030     <0.010      0.011*      0.020      0.010      0.010     <0.010     <0.010
 00671 PHOSPHORUS ORTHO (MG/L AS P)       85      0.100      0.010      0.047       0.087      0.060      0.040      0.030      0.013
 00666 PHOSPHORUS DISS. (MG/L AS P)      134      0.120      0.020      0.056       0.090      0.070      0.050      0.040      0.030
 00625 NITROGEN A+O TOT. (MG/L AS N)      156      4.100     <0.200      0.473*      1.100      0.600      0.400      0.220     <0.200
 00665 PHOSPHORUS TOTAL (MG/L AS P)      167      0.240      0.020      0.084       0.146      0.100      0.080      0.060      0.040


 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