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 USGS Station 12027500
CHEHALIS RIVER NEAR GRAND MOUND, WA

CHEHALIS RIVER BASIN

Latitude: 46^46'34"; Longitude: 123^02'04"
Hydrologic Unit Code: 17100103
Drainage area: 895 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 12027500

                                           MEDIAN   
                     25             75     CUMU-    
                   QUAR            QUAR-   LATIVE   
PERIOD      AVG.    ILE   MEDIAN   TILE    RUNOFF   
           (cfs)   (cfs)   (cfs)   (cfs)   (inch)   
-------------------------------------------------
OCT.	     885     433     725    1112    0.93
NOV.	    3841    1923    3122    5684    4.99
DEC.	    6207    3728    5557    9239    14.3
OCT-DEC	    3644    2592    3740    4689
CALYEAR	    2799    2236    2678    3342

JAN.	    6762    4245    6500    9444    21.6
FEB.	    5626    3496    5484    7007    29.9
MAR.	    4639    3209    4480    5663    35.9
JAN-MAR	    5675    3809    5780    7095
OCT-MAR	    4660    3770    4718    5613

APR.	    2826    1979    2738    3442    38.6
MAY	    1362     955    1233    1635    40.6
JUNE	     809     511     715     980    41.5
APR-JUN	    1665    1313    1555    1980

JULY	     392     300     374     442    41.9
AUG.	     255     197     251     302    42.2
SEP.	     389     277     327     423    42.5
JUL-SEP	     345     269     327     400
APR-SEP	    1005     794     971    1187

WATYEAR	    2821    2375    2801    3229

Extreme High and Low Monthly and Daily Average Flows for Station 12027500

                    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.	2635.   56 2457.   35 2429.   48 17500.  35 125.    53 211.    88 224.    37 104.    53 
NOV.	9697.   56 9326.   84 9192.   35 46000.  87 221.    37 257.    53 326.    30 150.    53 
DEC.	19281.  34 12403.  56 11294.  78 46300.  38 884.    77 1233.   31 1850.   45 190.    53 
JAN.	13899.  71 12802.  53 11883.  64 58500.  90 860.    77 1660.   79 2072.   30 546.    77 
FEB.	11487.  61 11097.  54 11056.  49 36500.  90 1201.   77 1682.   73 1884.   41 520.    77 
MAR.	9477.   72 9060.   56 8497.   50 24500.  87 1462.   41 1903.   65 2107.   81 802.    41 
APR.	6787.   37 5554.   55 5179.   31 22700.  37 1086.   39 1098.   41 1134.   42 620.    41 
MAY	3496.   48 2998.   84 2870.   40 9700.   48 549.    39 709.    31 710.    47 414.    47 
JUNE	2482.   36 1902.   37 1867.   90 9710.   36 353.    34 356.    51 381.    38 219.    51 
JULY	934.    83 639.    74 625.    42 2290.   83 174.    70 182.    51 187.    65 128.    65 
AUG.	570.    68 356.    78 352.    83 2240.   68 118.    67 123.    51 129.    58 85.     67 
SEP.	1289.   78 876.    59 869.    68 3410.   78 117.    67 131.    38 135.    52 89.     67
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