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 USGS Station 01646502
POTOMAC RIVER NEAR WASHINGTON, DC

POTOMAC RIVER BASIN

Latitude: 38^56'58"; Longitude: 77^07'40"
Hydrologic Unit Code: 02070008
Drainage area: 11,560 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 01646502

                                           MEDIAN   
                     25             75     CUMU-    
                   QUAR            QUAR-   LATIVE   
PERIOD      AVG.    ILE   MEDIAN   TILE    RUNOFF   
           (cfs)   (cfs)   (cfs)   (cfs)   (inch)   
-------------------------------------------------
OCT.	    6603    2319    2889    6236    0.29
NOV.	    8216    3359    5095   10673    0.87
DEC.	   11518    4606    9644   16261    1.99
OCT-DEC	    8779    4170    6722   12934
CALYEAR	   11923    8734    1142   14497

JAN.	   12650    7226   11328   17343    3.19
FEB.	   18007   11324   16101   25022    4.76
MAR.	   24063   13370   24362   30656    7.53
JAN-MAR	   18240   13552   18670   21845
OCT-MAR	   13509    9937   12790   17444

APR.	   20619   12139   16118   26760    10.1
MAY	   16113    9370   15064   20272    11.1
JUNE	    9993    5790    7602   13066    12.0
APR-JUN	   15575   10408   14568   20210

JULY	    5329    3047    4647    6121    12.5
AUG.	    4281    2102    3344    6020    12.8
SEP.	    4619    2114    2771    4533    13.0
JUL-SEP	    4743    2700    3911    5548
APR-SEP	   10159    4977    9614   13775

WATYEAR	   11798    9498   11042   14159

Extreme High and Low Monthly and Daily Average Flows for Station 01646502

                    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.	44448.  43 37219.  77 34229.  80 407000. 43 857.    31 1163.   42 1280.   64 769.    31 
NOV.	42616.  86 21341.  33 20531.  73 294000. 86 1013.   31 1244.   32 1418.   66 733.    31 
DEC.	36094.  73 31273.  51 29345.  49 126000. 51 1421.   66 1916.   44 2044.   31 824.    31 
JAN.	37587.  37 33223.  49 31059.  79 118000. 43 2035.   66 2202.   81 2867.   56 813.    66 
FEB.	39928.  84 37075.  39 34890.  71 209000. 84 3285.   34 4017.   31 4901.   54 1160.   66 
MAR.	76781.  36 46290.  62 45419.  63 426000. 36 6797.   31 7403.   90 8042.   81 2900.   34 
APR.	48717.  83 48310.  84 46150.  87 310000. 37 7435.   69 7573.   47 8700.   68 3720.   66 
MAY	40410.  89 39490.  88 31206.  78 163000. 32 4278.   30 4354.   69 4465.   41 2770.   30 
JUNE	47117.  72 22621.  82 19398.  51 334000. 72 2686.   69 2980.   65 2992.   66 1460.   66 
JULY	21352.  49 17684.  72 11980.  89 82600.  49 1193.   66 1578.   30 1877.   65 814.    66 
AUG.	28492.  55 14495.  42 13709.  33 207000. 55 884.    30 1011.   66 1491.   32 732.    66 
SEP.	25721.  75 21870.  79 20236.  45 186000. 75 994.    30 1225.   64 1314.   32 601.    66