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Water Resources of New Hampshire and Vermont
HIGH FLOWS IN NEW HAMPSHIRE AND VERMONT FROM TROPICAL STORM IRENE ESTIMATED


September 2011

Peak river stages and streamflows for 20 long-term streamgaging stations located across New Hampshire and Vermont are presented in the map to the right and table below. New record peak stages and streamflows were recorded at 11 of the 20 sites and are estimated as having peak flows with an annual exceedance probability (AEP) of 1% or less, or in other words, flows with 1 percent chance of being equaled or exceeded in any one year. Nine of the sites recorded lesser flows but still ranked amongst the highest 4 peaks ever recorded at those sites and having AEP ranging from 10% (1 in 10 chance of being equaled or exceeded in any one year) to 2% (1 in 50 chance of being equaled or exceeded in any one year).

The USGS has also provided these and other record streamflows along the east coast of the U.S. on the Hurricane Irene Activities website.

The New Hampshire-Vermont Office has field personnel collecting additional high water mark information from a network of streamgages across the two states at sites where indirect determinations of flow need to be made for estimating peak flows. In addition, field personnel will be collecting high water mark data at a network of crest and discontinued streamgage sites across the affected area for use in documenting the historical flood event and in determination of peak flows at a network of smaller, sometimes higher elevation, and flashier watersheds across the area. These data are expected to be updated as new data are available.

  Map of NH and VT gages with significant peak flows following Irene; Click on triangles for streamflow data SACO RIVER NEAR CONWAY, NH PEMIGEWASSET RIVER AT WOODSTOCK, NH CONNECTICUT RIVER AT WEST LEBANON, NH CONNECTICUT RIVER AT NORTH WALPOLE, NH EAST BRANCH PASSUMPSIC RIVER NEAR EAST HAVEN, VT WELLS RIVER AT WELLS RIVER, VT AYERS BROOK AT RANDOLPH, VT WHITE RIVER AT WEST HARTFORD, VT WILLIAMS RIVER NEAR ROCKINGHAM, VT SAXTONS RIVER AT SAXTONS RIVER, VT WALLOOMSAC RIVER NEAR NORTH BENNINGTON, VT POULTNEY RIVER BELOW FAIRHAVEN, VT OTTER CREEK AT CENTER RUTLAND, VT WINOOSKI RIVER AT MONTPELIER, VT DOG RIVER AT NORTHFIELD FALLS, VT MAD RIVER NEAR MORETOWN, VT WINOOSKI RIVER NEAR ESSEX JUNCTION, VT LAMOILLE RIVER AT JOHNSON, VT MISSISQUOI RIVER NEAR NORTH TROY, VT BLACK RIVER AT COVENTRY, VT

 

PROVISIONAL PEAK STREAMFLOW DATA FOR AUGUST 28-29, 2011

           
      Highest Peak from 2011-08-27 to 2011-08-31 Historical Peaks  
USGS
Station
Number
USGS Station Name Drainage
Area
Date Stage Streamflow
Discharge
*AEP Rank Maximum
Streamflow

Discharge
Year No. of
Years
    sq.mi.   feet ft3/s     ft3/s    
NEW HAMPSHIRE                  
01064500 SACO RIVER NEAR CONWAY,  NH
385
28-Aug
17.23
65,000
<1%
1
47,200
1953
87
01075000 PEMIGEWASSET RIVER AT WOODSTOCK, NH
193
28-Aug
16.53
48,200
<1%
1
47,000
1959
65
01144500 CONNECTICUT RIVER AT WEST LEBANON, NH
4092
29-Aug
29.62
104,000
a
4
136,000
1927
96
01154500 CONNECTICUT RIVER AT NORTH WALPOLE, NH
5493
29-Aug
31.36
98,000
a
1
97,000
1953
69
                     
VERMONT                  
01133000  EAST BRANCH PASSUMPSIC RIVER NEAR EAST HAVEN, VT
53.8
28-Aug
9.76
3,220
4-2%
3
4,450
1973
50
01139000  WELLS RIVER AT WELLS RIVER, VT
98.4
28-Aug
9
5,140
2-1%
2
5,970
1973
69
01142500 AYERS BROOK AT RANDOLPH, VT
30.5
28-Aug
15.17
5,630
<1%
1
3,480
1973
71
01144000 WHITE RIVER AT WEST HARTFORD, VT
690
28-Aug
28.4
b
b
b
120,000
1927
94
01153550  WILLIAMS RIVER NEAR ROCKINGHAM, VT
112
28-Aug
17.94
48,700
<1%
1
11,500
1987
23
01154000  SAXTONS RIVER AT SAXTONS RIVER, VT
72.2
28-Aug
19.57
14,700
<1%
1
9,620
1936
52
01334000 WALLOOMSAC RIVER NEAR NORTH BENNINGTON, VT
111
28-Aug
12.82
9,420
2-1%
1
8,450
1938
78
04280000  POULTNEY RIVER BEL FAIRHAVEN, VT
187
29-Aug
23.28
12,800
<1%
2
14,800
1945
80
04282000  OTTER CREEK AT CENTER RUTLAND, VT
307
29-Aug
17.21
18,300
<1%
1
13,700
1938
81
04286000  WINOOSKI RIVER AT MONTPELIER, VT
397
28-Aug
19.05
14,600
a
4
57,000
1927
94
04287000  DOG RIVER AT NORTHFIELD FALLS, VT
76.1
28-Aug
17.26
23,500
<1%
1
10,600
1973
75
04288000 MAD RIVER NEAR MORETOWN, VT
139
28-Aug
19.06
23,600
<1%
1
23,000
1927
82
04290500 WINOOSKI RIVER NEAR ESSEX JUNCTION, VT
1044
29-Aug
22.19
38,900
2-1%
3
113,000
1927
82
04292000 LAMOILLE RIVER AT JOHNSON, VT
310
29-Aug
16.54
13,100
10-4%
3
19,000
1995
83
04293000 MISSISQUOI RIVER NEAR NORTH TROY, VT
131
29-Aug
13.94
10,900
<1%
2
11,500
2002
78
04296000 BLACK RIVER AT COVENTRY, VT
142
29-Aug
8.24
4,120
2-1%
1
3,740
1976
58
                     

*AEP Annual Exceedance Probability. Example, for site with AEP shown as 1%, there is a 1 percent chance of being equaled or exceeded in any one year.
a regulated site, AEP not determined            
b discharge and AEP being computed by indirect methods            
                     


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