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New Hampshire-Vermont Water Science Center

Map showing stream gages in New Hampshire coded by recurrence intervals exceeded in May 2006 flooding

Recurrence intervals (or return intervals) are used by hydrologists to describe the magnitude and frequency of floods and represent the average interval of time over which floods of similar magnitudes are expected to occur. In the map below, hovering over any colored triangle reveals discharge (in cubic feet per second) at that gage during the flooding and the gage's station name, location, and number. All except 2 are operated by the USGS and linked to the real-time data collected continuously.

Map of USGS Stream-gaging stations; Colored triangles show gages on flooded rivers in May 2006 and are linked to real-time data

 

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21,300 CFS on May 14 -- Pemigewasset R., Plymouth, NH, Station 01076500 4,590 CFS on May 14 -- Smith R., Bristol, NH, Station 01078000 2,930 CFS on May 14 -- Winnipesaukee R., Tilton, NH, Station 01081000 9,300 CFS on May 15 -- Warner R., Davisville, NH, Station 01086000 5,660 CFS on May 14 -- Soucook River, at Pembroke Road, near Concord, NH, Station 01089100 5,930 CFS on May 14 -- Cocheco River near Rochester, NH, Station 01072800 3,980 CFS on May 15 -- Mascoma R., Mascoma, NH, Station 01150500 5,260 CFS on May 14 -- Salmon Falls R., Milton, NH, Station 1072100 821 CFS on May 14, Oyster R., Durham, NH, Station 01073000 9,100 CFS on May 16 -- Lamprey R., Newmarket, NH, Station 01073500 3,320 CFS on May 15 -- Exeter R., Brentwood, NH, Station 01073587 10,400 CFS on May 14 -- Contoocook R., Henniker, NH, Station 01085000 10,100 CFS on May 14 -- Piscataquog R., Goffstown, NH, Station 01091500 74,800 CFS on May 15 -- Merrimack R., Manchester, NH, Station 01092000 6,140 CFS on May 15 -- Souhegan R., Merrimack, NH, Station 01094000 2,750 CFS on May 15 -- Beaver Brk., North Pelham, NH, Station 010965852 2,080 CFS on May 16 -- Spicket R., near Methuen, MA, Station 01100561 6,580 CFS on May 15 -- Sugar R., West Claremont, NH, Station 01152500