ANDROSCOGGIN RIVER BASIN
01053500 ANDROSCOGGIN RIVER AT ERROL, NH
LOCATION.--Lat 44°46'57", long 71°07'46", Coos County, Hydrologic Unit 01040001, on right bank, 0.4 mi downstream from
Errol Dam, 0.4 mi northeast of Errol, and 0.6 mi upstream from Clear Stream.
DRAINAGE AREA.--1,046 mi².
PERIOD OF RECORD.--Discharge records: January 1905 to current year. November and December 1912, monthly discharges
only, published in WSP 1301. Prior to 1922, published as "at Errol Dam." Records for water years 1923-44 have not
been published but are available in the files of the U.S. Geological Survey.
Water-quality records: Water years 1955, 1958.
REVISED RECORDS.--WRD ME-81-l: Drainage area.
GAGE.--Water-stage recorder. Datum of gage is 1,227.30 ft above sea level. Prior to December 8, 1943, nonrecording
gage at Errol Dam at datum 5.0 ft higher.
REMARKS.--No estimated daily discharges. Records good. Flow regulated by Rangeley, Mooselookmeguntic, Richardson,
Aziscohos, and Umbagog Lakes (Reservoirs in Androscoggin River Basin), combined usable capacity, 28 billion ft³,
with final regulation at Errol Dam, 0.4 mi upstream. Satellite gage-height telemeter at station.
EXTREMES FOR PERIOD OF RECORD.--Maximum discharge, 16,500 ft³/s, May 22, 1969, gage height, 9.40 ft; minimum daily
discharge, leakage only at various times when gates in dam were closed in water years 1918, 1919, 1923, 1924, 1928,
and 1941.
EXTREMES FOR CURRENT YEAR.--Maximum discharge, 5,150 ft³/s, May 3, gage height, 4.81 ft; minimum daily discharge,
887 ft³/s, October 23.
REVISIONS.--The maximum discharges for water years 1906 to 1943 have been estimated as shown in the following table.
These values supersede those published for those years.
Date Discharge Date Discharge Date Discharge Date Discharge Date Discharge
(ft³/s) (ft³/s) (ft³/s) (ft³/s) (ft³/s)
May 22, 1906 6,530 May 11, 1914 7,320 May 2, 1923 10,000 June 12, 1930 7,710 May 17, 1937 9,920
May 4, 1907 7,680 Nov. 19, 1914 2,660 Sep. 12, 1924 5,290 Apr. 15, 1931 3,910 Apr. 22, 1938 9,920
Nov. 9, 1907 9,050 June 13, 1916 6,550 Nov. 24, 1924 4,730 May 5, 1932 8,020 May 11, 1939 8,300
May 19, 1909 9,740 June 21, 1917 12,900 Nov. 18, 1925 9,720 May 9, 1933 13,600 May 4, 1940 10,300
Apr. 9, 1910 7,070 Dec. 4, 1917 4,220 Apr. 24, 1927 5,580 Apr. 21, 1934 9,340 Apr. 17, 1941 6,960
May 3, 1911 4,520 May 26, 1920 5,290 May 26, 1928 13,400 June 21, 1935 8,440 June 19, 1942 13,100
June 4, 1912 6,220 Mar. 29, 1921 4,360 May 10, 1929 15,800 Mar. 21, 1936 12,800 June 18, 1943 16,200
Apr. 29, 1913 6,920 June 22, 1922 7,080
The maximum discharges for water years 1978 to 1984 have been revised, as shown in the following table. These values
supersede those published in the report for those years
Water Year Date Discharge Gage height Water Year Date Discharge Gage height
(ft³/s) (ft) (ft³/s) (ft)
1978 June 11, 1978 7,270 5.97 1982 Apr. 28, 1982 6,490 5.59
1979 Apr. 29, 1979 6,170 5.43 1983 May 6, 1983 6,940 5.81
1980 Apr. 16, 1980 2,710 3.21 1984 June 1, 1984 13,300 8.53
1981 Feb. 24, 1981 7,370 6.02
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 1570 1370 1490 1920 2180 2120 2030 2670 3080 1910 1840 1940
2 1500 1370 1150 1920 2180 2120 2030 3640 2880 1910 1850 1940
3 1460 1370 1580 1920 2180 2160 1970 4670 2540 1910 1850 1940
4 1480 1440 2450 1920 2180 2240 2030 4810 2190 2260 1810 1870
5 1530 1490 2520 1910 2180 2240 2030 3700 2050 2450 1630 2120
6 1560 1490 2510 1920 2270 2370 2030 3060 2050 2450 1630 2120
7 1580 1470 2100 1920 2310 3020 2030 2690 2060 2100 1630 2120
8 1560 1500 1950 1960 2310 3560 2040 2490 2060 1920 1630 2180
9 1440 1500 1950 1980 2310 3670 2040 2490 2140 1850 1630 2210
10 1440 1500 1820 1990 2320 3430 2330 2490 1860 2280 1630 2200
11 1440 1500 1760 1990 2310 3160 2490 2490 1680 2450 1630 2200
12 1450 1500 1820 1990 2320 2990 2450 2090 1680 2080 1630 2200
13 1440 1500 1850 2040 2320 3120 2400 1930 1630 1910 1640 2190
14 1420 1500 1850 2060 2320 3110 2120 1940 1800 1910 1640 2210
15 1430 1500 1850 2060 2320 3110 2020 1940 1680 1910 1640 2210
16 1430 1500 1860 2060 2320 3110 2020 2300 1720 1920 1720 2200
17 1430 1500 1860 2060 2330 3100 2020 2470 1680 1910 1750 2200
18 1430 1500 1860 2060 2320 3090 1860 2470 1670 1970 1750 2040
19 1430 1500 1720 2060 2320 3090 2030 2710 1640 2120 1750 1920
20 1430 1530 1660 2120 2330 3060 2030 3150 1650 2120 1740 1920
21 1430 1560 1840 2170 2210 2720 2030 3350 1650 2050 1740 1920
22 1070 1560 1920 2180 2040 2490 2010 3350 2330 2020 1740 1920
23 887 1560 1920 2180 2110 2550 1960 3350 3700 1700 1740 1920
24 938 1560 1920 2180 2110 2540 2090 3350 4350 1780 1740 1920
25 1060 1560 1920 2180 2120 2500 1960 3350 3950 2040 1720 1920
26 1220 1460 1920 2180 2120 2430 2480 3340 3370 2040 1750 1920
27 1300 1430 1920 2180 2120 2140 2460 3340 2670 2040 1750 1920
28 1300 1420 1920 2180 2120 2020 2480 3330 2460 1820 1760 1910
29 1290 1460 1920 2190 --- 2040 2480 3150 2460 1720 1760 1920
30 1340 1480 1920 2180 --- 2040 2490 3080 2090 1740 1770 1840
31 1370 --- 1920 2180 --- 2030 --- 3080 --- 1840 1880 ---
TOTAL 42655 44580 58650 63840 62580 83370 64440 92270 68770 62130 53370 61040
MEAN 1376 1486 1892 2059 2235 2689 2148 2976 2292 2004 1722 2035
MAX 1580 1560 2520 2190 2330 3670 2490 4810 4350 2450 1880 2210
MIN 887 1370 1150 1910 2040 2020 1860 1930 1630 1700 1630 1840
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1906 - 1997, BY WATER YEAR (WY)
MEAN 1588 1548 1705 1791 1848 1852 2121 3107 2268 1776 1685 1691
MAX 3949 3745 4722 3589 3644 5454 4736 8192 7129 4621 2265 4738
(WY) 1955 1908 1974 1970 1996 1936 1913 1974 1917 1996 1990 1954
MIN 921 759 844 760 718 592 770 1027 763 808 840 902
(WY) 1922 1922 1909 1909 1911 1948 1940 1941 1911 1915 1915 1911
SUMMARY STATISTICS FOR 1996 CALENDAR YEAR FOR 1997 WATER YEAR WATER YEARS 1905 - 1997
ANNUAL TOTAL 1088605 757695
ANNUAL MEAN 2974 2076 1914
HIGHEST ANNUAL MEAN 3117 1996
LOWEST ANNUAL MEAN 1046 1911
HIGHEST DAILY MEAN 9300 May 14 4810 May 4 16100 May 22 1969
LOWEST DAILY MEAN 887 Oct 23 887 Oct 23 a .00 Oct 31 1917
ANNUAL SEVEN-DAY MINIMUM 1110 Oct 22 1110 Oct 22 152 Mar 21 1948
INSTANTANEOUS PEAK FLOW 5150 May 3 16500 May 22 1969
INSTANTANEOUS PEAK STAGE 4.81 May 3 9.40 May 22 1969
10 PERCENT EXCEEDS 6050 2920 2630
50 PERCENT EXCEEDS 2330 1990 1700
90 PERCENT EXCEEDS 1450 1490 1130
a As explained under Extremes for Period of Record.
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