CONNECTICUT RIVER BASIN

                             01130000  UPPER AMMONOOSUC RIVER NEAR GROVETON, NH

LOCATION.--Lat 44°37'30", long 71°28'10", Coos County, Hydrologic Unit 01080101, on left bank, 75 ft upstream from 
    highway bridge, 0.2 mi downstream from Nash Stream, and 2.8 mi northeast of Groveton.
DRAINAGE AREA.--232 mi².
PERIOD OF RECORD.--Discharge records:  August 1940 to November 1980, October 1982 to current year. 
    Water-quality records:  Water year 1955.
GAGE.--Water-stage recorder.  Elevation of gage is 920 ft above sea level, from topographic map.
REMARKS.--Records good except those for estimated daily discharges which are poor and daily flow below 100 ft³/s during 
    shifting control period, October 3-8, which are fair.  Prior to May 21, 1969, some regulation by pond 9 mi upstream 
    on Nash Stream.  Small diversion upstream for municipal supply of Berlin.
EXTREMES FOR CURRENT YEAR.--Peak discharges greater than base discharge of 2,900 ft³/s and maximum (*):
                           Discharge        Gage height                                   Discharge        Gage height
  Date         Time         (ft³/s)            (ft)              Date         Time         (ft³/s)            (ft)  
Dec.  2        1415        * 3,530             6.02             May  2        0430          3,020             5.66
Feb. 23        1000         Ice Jam          * 7.17
   Minimum discharge, 56 ft³/s, October 8.

                      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       153      520     e300     e300     e190     e500     1070     2010      703      228      104      284
   2       114      429     2200     e310     e185     e680      691     2930      685      218       98      266
   3        96      380     2620     e380     e180     e880      551     2370      560      312      107      229
   4        89      346     1260     e360     e180     e700      507     1740      480      723      107      221
   5        77      334      716     e340     e175     e520      612     1390      430      526       97      201
 
   6        64      333      561     e510     e180     e450     1160     1330      383      340       94      180
   7        62      332      480     e440     e175     e390     2110     1710      347      270       87      165
   8        60      327      365     e330     e165     e310     2320     1390      318      260       79      163
   9       244      387      433     e300     e160     e280     1470     1180      290      467       76      164
  10       382      645      412     e310     e160     e250      913     1080      263      792       85      141
 
  11       421      529      373     e300     e155      294      690     1040      243      461       96      132
  12       292      427      331     e280     e160     e270      614      954      255      312      123      141
  13       234      365      306     e260     e150     e230      569     1120      423      258      232      150
  14       191      312      292     e255     e145     e200      568     1280      748      316      664      162
  15       156     e250      287     e250     e145     e210      540     1310      464      622      285      148
 
  16       135     e340      278     e245     e140     e180      603     1660      327      684      198      122
  17       134      407      288     e255     e140     e160      900    e1500      277      432      215      108
  18       142      359      506     e245     e140     e150     1600    e1250      291      315      209      104
  19       126      287      630     e230     e180     e150     2560    e1200      986      271      151      102
  20       117      278      542     e220     e280     e165     2470     1100      733      259      116      108
 
  21       399      266     e380     e210     e270      198     1980     1060      441      240      119      155
  22      2120      251     e310     e205     e600     e160     1670     1020     1290      223      228      152
  23      2130      238     e310     e210     e950     e155     1620     1130     1580      205      255      125
  24      1040      199     e450     e230     e750     e150     1600      963      815      192      236      132
  25       693     e190     1470     e210     e510     e145     1350      858      565      178      204      129
 
  26       538     e175      926     e220     e410      280     1380      843      739      165      162      112
  27       427     e190      610     e210     e450      570     1580      717      537      159      139      103
  28       399     e170      520     e200     e590      455     1840      622      387      165      700       97
  29       410     e160      534     e200      ---      558     1740      621      296      160      579      103
  30       391     e170      650     e190      ---     1340     1450      633      253      137      594      218
  31       553      ---      411     e185      ---     1520      ---      698      ---      115      371      ---
 
 TOTAL   12389     9596    19751     8390     7915    12500    38728    38709    16109    10005     6810     4617
 MEAN      400      320      637      271      283      403     1291     1249      537      323      220      154
 MAX      2130      645     2620      510      950     1520     2560     2930     1580      792      700      284
 MIN        60      160      278      185      140      145      507      621      243      115       76       97
 CFSM     1.72     1.38     2.75     1.17     1.22     1.74     5.56     5.38     2.31     1.39      .95      .66
 IN.      1.99     1.54     3.17     1.35     1.27     2.00     6.21     6.21     2.58     1.60     1.09      .74
 (|)      6.19     5.16     4.99     4.58     4.69     4.52     3.98     3.07     2.80     2.96     2.79     3.09

 STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1940 - 1997, BY WATER YEAR (WY)
 
 MEAN      316      452      350      251      213      448     1420     1146      447      239      204      199
 MAX      1057     1128      994      748      851     1374     2416     2695     1115      840      572     1427
 (WY)     1991     1970     1974     1978     1970     1945     1954     1972     1947     1996     1969     1954
 MIN      69.7      118     68.6     53.3     56.6     74.4      532      402      179     94.0     78.4     51.0
 (WY)     1949     1948     1948     1948     1980     1941     1995     1941     1953     1991     1975     1948
 
 SUMMARY STATISTICS           FOR 1996 CALENDAR YEAR        FOR 1997 WATER YEAR           WATER YEARS 1940 - 1997
 
 ANNUAL TOTAL                      232355                     185519                                             
 ANNUAL MEAN                          635                        508                        474                  
 HIGHEST ANNUAL MEAN                                                                        696              1954
 LOWEST ANNUAL MEAN                                                                         297              1980
 HIGHEST DAILY MEAN                  7340     Apr 24            2930     May  2            8350       Apr 23 1954
 LOWEST DAILY MEAN                     40     Sep 24              60     Oct  8              32       Sep 14 1948
 ANNUAL SEVEN-DAY MINIMUM              61     Sep 19              80     Oct  2              37       Sep  9 1948
 INSTANTANEOUS PEAK FLOW                                        3530     Dec  2         a 24100       May 20 1969
 INSTANTANEOUS PEAK STAGE                                        b 7.17  Feb 23            c 12.01    May 20 1969
 INSTANTANEOUS LOW FLOW                                           56     Oct  8              32       Sep 14 1948
 ANNUAL RUNOFF (CFSM)                   2.74                       2.19                       2.04               
 ANNUAL RUNOFF (INCHES)                37.26                      29.75                      27.75               
 10 PERCENT EXCEEDS                  1480                       1280                       1110                  
 50 PERCENT EXCEEDS                   376                        310                        243                  
 90 PERCENT EXCEEDS                   115                        132                         94                  
 
  (|) Diversion in cubic feet per second for municipal supply of Berlin; records furnished by City of Berlin.
   a  From rating curve extended above 5,600 ft³/s on basis of contracted-opening measurement of peak flow. 
   b  Ice jam.
   c  From floodmarks. Caused by failure of dam on Nash Stream.
   e  Estimated.

The URL for this page is: http://nh.water.usgs.gov/Publications/annual97/01130000.htm

Back to station selections
Back to District Home Page
To WRD National Home Page
To USGS National Home Page
Comments and suggestions can be sent to NH-VT Webmaster