May 2021 CURRENT WATER RESOURCES CONDITIONS IN NEW HAMPSHIRE

CURRENT WATER RESOURCES CONDITIONS IN NEW HAMPSHIRE

U.S. Department of the Interior Seal

May 2021

USGS New England Water Science Center, New Hampshire-Vermont Office

PROVISIONAL DATA: All data presented in this report are provisional and subject to revision.

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Monthly Surface Water Conditions Map

Monthly Groundwater Conditions Map

SURFACE WATER
Station Number	Station Name	Drainage Area (mi²)	Years Of Record	Normal Range (cfs)	Monthly Mean (cfs)	Monthly Mean (in)	Percentile Class
01052500	Diamond River near Wentworth Location, NH	152	79	503 - 1100	370	2.81	Much below normal
01064500	Saco River near Conway, NH	385	117	1460 - 2600	977	2.93	Much below normal
01073500	Lamprey River near Newmarket, NH	185	86	212 - 474	169	1.05	Below normal
01076500	Pemigewasset River at Plymouth, NH	622	117	1900 - 3270	1580	2.93	Below normal
01092000	Merrimack River near Goffs Falls below Manchester, NH	3092	84	5560 - 11000	5620	2.10	Normal
01137500	Ammonoosuc River at Bethlehem Junction, NH	87.6	81	366 - 588	350	4.61	Below normal

GROUNDWATER
Station Number	Station Name	Years Of Record	Normal Range (ft)	Monthly Median (ft)	Departure From Monthly Median (ft)	Percentile Class
431540071452801	WCW 1 (Warner, NH)	50¹	28.70 - 27.60	30.09	1.89	Low
442450071052301	SJW 2 (Shelburne, NH)	25¹	4.65 - 3.41	5.64	1.75	Much below normal
¹ Daily Value Records and Field Readings ² Daily Value Records Only

Flow or Water Level	Percentile Range	Explanation
Low	0^th	The monthly mean streamflow or median water level during this month is the lowest ever recorded during the period of record for this site.
Much below normal	0^th to 10^th	The monthly mean streamflow or median water level during this month is less than the 10^th percentile when compared to all of the months during the period of record for this site.
Below normal	10^th to 25^th	The monthly mean streamflow or median water level during this month is between the 10^th and 25^th percentiles when compared to all of the months during the period of record for this site.
Normal	25^th to 75^th	The monthly mean streamflow or median water level during this month is between the 25^th and 75^th percentiles when compared to all of the months during the period of record for this site.
Above normal	75^th to 90^th	The monthly mean streamflow or median water level during this month is between the 75^th and 90^th percentiles when compared to all of the months during the period of record for this site.
Much above normal	90^th to 100^th	The monthly mean streamflow or median water level during this month is greater than the 90^th percentile when compared to all of the months during the period of record for this site.
High	100^th	The monthly mean streamflow or median water level during this month is the highest ever recorded during the period of record for this site.