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 USGS Station 11098000
ARROYO SECO NEAR PASADENA, CA

LOS ANGELES RIVER BASIN

Latitude: 34^13'20"; Longitude: 118^10'36"
Hydrologic Unit Code: 18070105
Drainage area: 16.0 square miles.
Additional information is available about this station.
Use these links to retrieve Streamflow Hydrograph, or tab-separated ASCII file of monthly data.

Summary of Monthly Flows (1961-90)for Station 11098000

                                           MEDIAN   
                     25             75     CUMU-    
                   QUAR            QUAR-   LATIVE   
PERIOD      AVG.    ILE   MEDIAN   TILE    RUNOFF   
           (cfs)   (cfs)   (cfs)   (cfs)   (inch)   
-------------------------------------------------
OCT.	    1.56    0.46    1.09    2.11    0.08
NOV.	    7.43    1.33    2.33    5.44    0.25
DEC.	    9.49    1.82    3.33    10.8    0.55
OCT-DEC	    6.16    1.48    2.57    5.78
CALYEAR	    11.0    2.56    4.54    11.8

JAN.	    19.3    3.29    7.21    21.9    1.17
FEB.	    30.9    4.05    8.40    21.5    2.30
MAR.	    30.8    3.36    11.5    27.7    3.70
JAN-MAR	    27.0    4.74    8.20    24.3
OCT-MAR	    16.6    3.41    8.70    15.9

APR.	    13.8    2.82    6.73    21.2    3.98
MAY	    7.50    1.77    4.18    7.39    4.27
JUNE	    3.86    0.94    2.15    3.57    4.42
APR-JUN	    8.39    1.98    4.68    9.55

JULY	    2.15    0.43    0.83    2.30    4.50
AUG.	    1.43    0.30    0.54    1.52    4.55
SEP.	    1.58    0.28    0.66    1.67    4.59
JUL-SEP	    1.72    0.36    0.89    1.81
APR-SEP	    5.05    1.60    2.70    5.34

WATYEAR	    10.7    2.57    5.41    9.66

Extreme High and Low Monthly and Daily Average Flows for Station 11098000

                    SECOND     THIRD                             SECOND     THIRD                
        MON.  HI.  MON.  HI.  MON.  HI.  DAILY  HI.  MON.  LO.  MON.  LO.  MON.  LO.  DAILY  LO. 
       ----------- ---------- ---------- ---------- ---------- ---------- ---------- ----------  
        FLOW  YR.  FLOW  YR.  FLOW  YR.  FLOW   YR.  FLOW  YR.  FLOW  YR.  FLOW  YR.  FLOW   YR. 
PERIOD  (cfs)      (cfs)      (cfs)      (cfs)       (cfs)      (cfs)      (cfs)      (cfs)      
------ ----------- ---------- ---------- ---------- ---------- ---------- ---------- ----------
OCT.	8.54    84 5.80    17 5.28    70 79.     35 0.00    27 0.05    29 0.05    30 0.00    35 
NOV.	97.40   66 26.60   47 25.20   68 742.    66 0.06    34 0.07    30 0.09    33 0.00    33 
DEC.	132.    22 62.80   67 55.60   66 1020.   22 0.14    30 0.25    33 0.40    57 0.10    30 
JAN.	251.    69 132.    14 123.    43 3210.   69 0.79    26 0.81    25 0.87    76 0.20    30 
FEB.	344.    14 249.    69 189.    80 3690.   14 0.93    24 0.96    30 1.08    25 0.70    30 
MAR.	235.    38 211.    83 189.    78 2700.   38 1.16    61 1.27    65 1.42    31 0.70    65 
APR.	91.50   41 77.80   58 76.30   26 484.    26 0.69    61 1.32