MERRIMACK RIVER BASIN

                                      01078000 SMITH RIVER NEAR BRISTOL, NH

LOCATION.--Lat 43°34'04", long 71°44'54", Merrimack County, Hydrologic Unit 01070001, on right bank, in Hill, 1.5 mi 
    upstream from mouth, and 1.8 mi southwest of Bristol.
DRAINAGE AREA.--85.8 mi².
PERIOD OF RECORD.--Discharge:  May 1918 to current year.
    Water-quality records:  Water years 1957, 1976-79.
REVISED RECORDS.--WSP 711:  Drainage area.  WSP 781:  1934.  WSP 1231:  1919, 1920-21(M), 1922-31, 1932-33(M), 1941-43.
GAGE.--Water-stage recorder.  Datum of gage is 449.80 ft above sea level (levels by U.S. Army Corps of Engineers).  
    Prior to November 25, 1933, nonrecording gage at site 1.5 mi upstream at different datum.
REMARKS.--Records good except those for estimated daily discharges, which are fair.  Prior to 1954, some diurnal 
    fluctuation caused by small mill upstream; greater fluctuation prior to 1941.  
EXTREMES OUTSIDE PERIOD OF RECORD.--Maximum stage since at least 1885, that of March 19, 1936.
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 1,150 ft³/s and maximum (*):
                           Discharge        Gage height                                   Discharge        Gage height
  Date         Time         (ft³/s)            (ft)              Date         Time         (ft³/s)            (ft)  
Oct. 21        1600        * 3,000           * 8.99            Apr. 19        2130          2,340             7.90
Dec.  3        0830          1,150             5.61
  Minimum discharge, 7.6 ft³/s, August 11.

                       DISCHARGE, CUBIC FEET PER SECOND, WATER YEAR OCTOBER 1996 TO SEPTEMBER 1997

                                                   DAILY MEAN VALUES
 
 DAY       OCT      NOV      DEC      JAN      FEB      MAR      APR      MAY      JUN      JUL      AUG      SEP
 
   1        30      129      150     e130       76      332      453      370      122       17     11         53
   2        26      112      866     e150       75      261      338      341      159       16     11         43
   3        21      101     1090      192       73      274      292      294      121       24     10         37
   4        18       92      770      170       71      236      321      316       96       43     10         34
   5        17       87      446      167       72      197      439      288       83       42     12         29
 
   6        18       83      289      194       77      190      646      266       74       30     13         24
   7        17       85      234      173       75     e160      884      465       67       23     11         22
   8        17      107      218      114       71     e140      997      429       61       20      9.4       29
   9        55      429      203     e110       70     e130      757      312       56       20      8.9       31
  10        83      707      184     e115       69      141      467      287       51       38      8.3       28
 
  11        96      620      166      108       67      132      347      285       49       40      8.1       26
  12        78      362      162       98       66      120      314      246       43       29      9.4       58
  13        55      235      193       95       64     e110      346      210       45       22     17         57
  14        44      178      192       91       63      e98      405      196       43       20     22         39
  15        35      147      190       92       66     e105      418      183       38       60     19         33
 
  16        32      141      197       94       64      110      433      196       33       69     16         25
  17        30      140      234       96       62       97      507      197       31       54     14         21
  18        33      127      406      e85       63       98      833      178       33       76     11         19
  19        29      115      458       81       80       90     1930      170       71       57      9.8       17
  20       173      120      429       79      137       92     1880      203       79       42      8.8       16
 
  21      2310      115      268       76      145       90     1170      189       57       32     19         16
  22      2330      107      227       76      175      e90      879      157       43       28     85         15
  23      1150      100      210       85      313      e80      709      140       34       24     62         15
  24       632       94      235       81      340      e73      598      126       28       21     37         14
  25       354       88      668       79      234      e75      482      121       26       18     25         14
 
  26       233      137     e520       86      180      125      396      117       24       17     20         14
  27       180      220     e390       84      201      198      353      106       22       16     19         14
  28       154      149      287       81      338      221      499       96       20       15     52         13
  29       144      135      240       79      ---      292      649       89       19       14    208         18
  30       128      117      334       76      ---     e470      502       82       18       13    134         21
  31       140      ---     e220       75      ---     e620      ---       80      ---       12     68        ---
 
 TOTAL    8662     5379    10676     3312     3387     5447    19244     6735     1646      952    968.7      795
 MEAN      279      179      344      107      121      176      641      217     54.9     30.7     31.2     26.5
 MAX      2330      707     1090      194      340      620     1930      465      159       76      208       58
 MIN        17       83      150       75       62       73      292       80       18       12      8.1       13
 CFSM     3.26     2.09     4.01     1.25     1.41     2.05     7.48     2.53      .64      .36      .36      .31
 IN.      3.76     2.33     4.63     1.44     1.47     2.36     8.34     2.92      .71      .41      .42      .34
 

 STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1918 - 1997, BY WATER YEAR (WY)
 
 MEAN     73.8      131      135      102     98.5      249      486      228      101     53.5     37.3     39.8
 MAX       279      379      393      300      578     1242     1077      504      353      387      340      457
 (WY)     1997     1928     1974     1996     1981     1936     1969     1954     1922     1973     1990     1938
 MIN      8.45     24.9     22.3     19.2     20.6     29.7      134     71.5     20.5     9.00     4.54     7.62
 (WY)     1948     1972     1923     1940     1980     1940     1995     1941     1964     1965     1965     1948
 
 SUMMARY STATISTICS           FOR 1996 CALENDAR YEAR        FOR 1997 WATER YEAR           WATER YEARS 1918 - 1997
 
 ANNUAL TOTAL                       94674                      67203.7                                           
 ANNUAL MEAN                          259                        184                        144                  
 HIGHEST ANNUAL MEAN                                                                        240              1996
 LOWEST ANNUAL MEAN                                                                          64.7            1965
 HIGHEST DAILY MEAN                  2330     Oct 22            2330     Oct 22            6890       Mar 19 1936
 LOWEST DAILY MEAN                     12     Sep  7               8.1   Aug 11               2.7     Aug  2 1933
 ANNUAL SEVEN-DAY MINIMUM              14     Sep  2               9.7   Aug  6               3.2     Sep 20 1939
 INSTANTANEOUS PEAK FLOW                                        3000     Oct 21          a 8100       Mar 19 1936
 INSTANTANEOUS PEAK STAGE                                          8.99  Oct 21            b 16.09    Mar 19 1936
 INSTANTANEOUS LOW FLOW                                            7.6   Aug 11               2.7     Aug  2 1933
 ANNUAL RUNOFF (CFSM)                   3.01                       2.15                       1.68               
 ANNUAL RUNOFF (INCHES)                41.05                      29.14                      22.87               
 10 PERCENT EXCEEDS                   689                        431                        350                  
 50 PERCENT EXCEEDS                   137                         92                         67                  
 90 PERCENT EXCEEDS                    23                         17                         17                  
 
   a  From rating curve extended above 2,700 ft³/s on basis of contracted-opening measurement of peak flow.
   b  From floodmarks.
   e  Estimated.

The URL for this page is: http://nh.water.usgs.gov/Publications/annual97/01078000.htm

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