CONNECTICUT RIVER BASIN

                                   01129440 MOHAWK RIVER NEAR COLEBROOK, NH

LOCATION.--Lat 44°52'28", Long 71°24'38", Coos County, Hydrologic Unit 01080101, on right bank, upstream of Bungy Road 
    Bridge, south of the intersection of State Highway 26 and Bungy Road, 0.8 mi upstream of Read Brook, 1.7 mi 
    downstream of Roaring Brook, 5 mi east of Colebrook, and 5.5 mi west of Dixville Notch.
DRAINAGE AREA.--36.7 mi².
PERIOD OF RECORD.--Discharge records: October 1986 to current year.
GAGE.--Water-stage recorder and crest stage gage.  Elevation of gage is 1,220 ft above sea level, from topographic map.
REMARKS.--Records good except those for estimated daily discharges, which are fair. 
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 500 ft³/s and maximum (*):
                           Discharge        Gage height                                   Discharge        Gage height
  Date         Time         (ft³/s)            (ft)              Date         Time         (ft³/s)            (ft)  
 Dec.  2       0945        * 3,370           * 8.14             May   1       2230          1,500             7.16
 Apr.  7       1730            921             6.64             June 21       2130            708             6.37
 Apr. 18       2045            554             6.12             July  9       1200          1,180             6.90
  Minimum discharge, 9.2 ft³/s, October 8, 9.

                      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      13         44      100      e39      e27       50       76      408       61       23       15       47
   2      11         37     1210      e49      e27      138       68      511       54       23       15       43
   3      13         32      194      e55      e26      121       66      201       46       88       74      101
   4      12         28      105      e50      e26       74       71      185       42       95       28       63
   5      11         32       83      e51      e25       60       99      143       39       47       35       45
 
   6      10         38       71      e82      e26       59      282      172       31       31       22       35
   7       9.7       34       59      e54      e25      e46      544      222       28       26       18       32
   8       9.3       34       63      e41      e24      e43      266      167       25       24       17       29
   9      53        110       64      e40      e23      e43      131      164       23      329       17       26
  10      37         92       53      e43      e23      e44      107      180       22      102       16       25
 
  11      36         57       49      e39      e22       44       99      159       23       53       73       24
  12      19         44       47      e36      e22       40       95      159       24       36       59       28
  13      16         36       46      e35      e21      e36       96      166       73       34      115       24
  14      15         34       46      e34      e21      e33       90      164       97       66       98       22
  15      14        e36       45      e33      e21      e35       87      182       42       71       38       21
 
  16      13        e38       45      e33      e20      e33      114      235       28       48       31       20
  17      12        e37       70      e35      e20      e29      155      179       26       35       43       18
  18      11         33      131      e31      e21      e29      304      138       38       30       27       17
  19      11         30      101      e31      e27      e28      339      133      101       28       22       16
  20      11         29       75      e29      e42      e28      229      122       48       33       19       36
 
  21      47         27       66      e28      e39      e30      198      118      165       26       22       38
  22     252         25      e60      e28     e170       29      186      171      327       25       44       22
  23     124         24      e55      e32     e140      e25      186      163      120       23       53       27
  24      77         26      120      e31     e100      e29      175      115       70       21       31       28
  25      52        e26      195      e30      e70      e27      160      102       62       20       23       20
 
  26      38         28      e81      e31      e58       42      181       98       62       19       22       19
  27      30        e30      e72      e30       50       35      186       86       43       19       21       19
  28      46        e27       63      e29       58       36      312       72       35       20       67       17
  29      45        e25      104      e28      ---      103      201       67       30       21      116       22
  30      40        e22      105      e27      ---      175      197       64       26       18      131       30
  31      61        ---       68      e26      ---      102      ---       64      ---       16       61      ---
 
 TOTAL  1149.0     1115     3646     1160     1174     1646     5300     5110     1811     1450     1373      914
 MEAN     37.1     37.2      118     37.4     41.9     53.1      177      165     60.4     46.8     44.3     30.5
 MAX       252      110     1210       82      170      175      544      511      327      329      131      101
 MIN       9.3       22       45       26       20       25       66       64       22       16       15       16
 CFSM     1.01     1.01     3.20     1.02     1.14     1.45     4.81     4.49     1.64     1.27     1.21      .83
 IN.      1.16     1.13     3.70     1.18     1.19     1.67     5.37     5.18     1.84     1.47     1.39      .93
 
 STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1987 - 1997, BY WATER YEAR (WY)
 
 MEAN     60.2     71.3     58.8     49.7     34.8     79.6      209      104     52.7     39.0     36.6     30.3
 MAX       122      110      127      134      109      156      344      177     73.1      108     93.3     53.2
 (WY)     1991     1989     1991     1996     1996     1990     1996     1989     1990     1996     1988     1993
 MIN      26.2     33.0     25.9     25.8     13.4     23.0     74.2     66.7     26.7     13.0     13.1     11.1
 (WY)     1995     1995     1990     1994     1993     1994     1995     1988     1992     1991     1987     1995
 
  SUMMARY STATISTICS           FOR 1996 CALENDAR YEAR        FOR 1997 WATER YEAR           WATER YEARS 1987 - 1997
 
 ANNUAL TOTAL                       37249.6                    25848.0                                           
 ANNUAL MEAN                          102                         70.8                       68.8                
 HIGHEST ANNUAL MEAN                                                                        104              1996
 LOWEST ANNUAL MEAN                                                                          44.1            1995
 HIGHEST DAILY MEAN                  1640     Apr 24            1210     Dec  2            2110       Apr  1 1987
 LOWEST DAILY MEAN                      7.5   Sep 24               9.3   Oct  8               5.3     Sep  5 1995
 ANNUAL SEVEN-DAY MINIMUM               8.5   Sep 18              11     Oct  2               5.8     Sep  1 1995
 INSTANTANEOUS PEAK FLOW                                      a 3370     Dec  2          a 7630       Apr  1 1987
 INSTANTANEOUS PEAK STAGE                                          8.14  Dec  2             b 9.00    Jan 21 1996
 INSTANTANEOUS LOW FLOW                                          c 9.2   Oct  8             d 5.2     Sep  4 1995
 ANNUAL RUNOFF (CFSM)                   2.77                       1.93                       1.87               
 ANNUAL RUNOFF (INCHES)                37.76                      26.20                      25.47               
 10 PERCENT EXCEEDS                   196                        165                        133                  
 50 PERCENT EXCEEDS                    54                         39                         40                  
 90 PERCENT EXCEEDS                    12                         20                         17                  
 

   a  From rating curve extended above 600 ft³/s.
   b  Ice jam.
   c  Also occurred October 9.
   d  Also occurred on September 5-7, 1996.
   e  Estimated.

The URL for this page is: http://nh.water.usgs.gov/Publications/annual97/01129440.htm

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