MERRIMACK RIVER BASIN
01080500 LAKE WINNIPESAUKEE OUTLET AT LAKEPORT, NH
LOCATION.--Lat 43°32'57", long 71°27'54", Belknap County, Hydrologic Unit 01070002, on right bank, 100 ft upstream from
highway bridge across Paugus Bay, 150 ft upstream of dam across Paugus Bay, at Lakeport, 1.4 mi north of Laconia
Post Office (Revised).
DRAINAGE AREA.--363 mi².
PERIOD OF RECORD.--Discharge records: January 1860 to December 1911 (monthly gage heights only, published in WSP 301),
June 1933 to September 1983. October 1987 to current year.
Water-quality records: Water years 1954-55.
GAGE.--Acoustic velocity meter and measuring flume. Datum of gage is 500.55 ft above sea level. January 1860 to
December 1911, nonrecording gage at site 150 ft downstream at same datum. June 1, 1933, to September 30, 1936,
nonrecording gage and continuous-recording current meter at present site and datum. October 1, 1936, to
May 23, 1944, discharge computed from flow over spillway and through gates and wheels at site 150 ft downstream.
May 24, 1944 to September 1983, record obtained from water-stage recorder, deflection meter, and measuring flume.
REMARKS.--Records poor except those for the period of August 5 to September 30, which are fair. Flow completely
regulated by Winnipesaukee (station 01080000), Wentworth, Merrymeeting (Reservoirs in Merrimack River Basin), and
other lakes. Daily discharge computed from the acoustic velocity meter.
COOPERATION.--Records were provided by New Hampshire Department of Environmental Services.
EXTREMES FOR CURRENT YEAR.--Maximum Daily discharge, 1,610 ft³/s, April 30; minimum daily discharge, 5 ft³/s,
October 23, 24.
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
1 190 920 859 1440 1100 1020 701 1600 e255 206 483 234
2 186 831 791 1440 1100 1020 685 1590 e260 225 479 286
3 170 859 768 1430 1100 1020 584 1580 e510 225 487 248
4 346 872 e770 1450 1100 1020 581 e1580 e500 231 488 249
5 181 871 e840 1440 1140 1020 594 1370 e500 220 492 339
6 e185 871 e880 1450 1100 1030 577 1080 e510 318 410 319
7 e190 866 e930 1440 1100 1020 594 1080 e500 233 445 333
8 e180 877 e860 1430 1090 1040 627 1080 e500 224 433 320
9 e170 866 e910 1420 1090 1020 597 850 e285 e245 369 345
10 e275 864 e1100 1430 1080 1030 626 734 e255 e255 423 337
11 e315 879 e930 1340 1080 1020 708 732 e250 e240 414 339
12 315 895 1080 1430 1070 1010 703 728 e250 e245 240 315
13 311 873 1060 1270 1070 1000 702 735 e250 e235 239 313
14 325 889 1050 1180 1100 1040 705 729 e250 e255 218 338
15 7.2 876 1060 1170 1070 1010 708 494 e250 e580 218 315
16 e8.0 866 1070 1340 1060 1010 712 372 e255 e700 222 306
17 e8.0 876 1060 1460 1060 995 682 366 e255 732 221 259
18 e8.0 884 e1050 1420 1040 1000 572 375 283 746 203 207
19 e8.0 918 e1350 1420 1040 1000 652 376 388 734 228 186
20 e8.0 958 1360 1410 1030 997 1070 619 280 726 230 279
21 e8.0 1070 1360 1410 1020 991 1070 504 256 702 244 283
22 e8.0 980 1360 1380 1010 998 1410 e380 260 829 261 205
23 e5.0 859 1360 1390 1020 983 1590 e380 253 831 202 197
24 5.0 853 1180 1390 1020 978 1590 e380 240 851 211 191
25 232 872 1040 1340 1020 978 1600 e380 e235 e890 239 259
26 939 884 1270 1160 1010 977 1600 e380 e235 1030 231 165
27 1070 878 1440 1380 1020 963 1590 e380 239 831 258 202
28 982 867 1440 1410 1020 880 1580 e330 232 829 283 170
29 809 861 1440 1400 --- 687 1590 e250 236 864 272 249
30 856 868 1430 1230 --- 696 1610 e260 235 728 204 250
31 1040 --- 1430 1110 --- 730 --- e250 --- 539 232 ---
TOTAL 9340.2 26603 34528 42410 29760 30183 28610 21944 9207 16499 9579 8038
MEAN 301 887 1114 1368 1063 974 954 708 307 532 309 268
MAX 1070 1070 1440 1460 1140 1040 1610 1600 510 1030 492 345
MIN 5.0 831 768 1110 1010 687 572 250 232 206 202 165
STATISTICS OF MONTHLY MEAN DATA FOR WATER YEARS 1933 - 1983, 1988 - 1997, BY WATER YEAR (WY)
MEAN 340 389 535 696 779 664 699 756 531 384 366 365
MAX 909 993 1245 1671 1672 1550 2596 2074 1549 1368 783 868
(WY) 1978 1982 1955 1955 1958 1951 1936 1996 1954 1973 1967 1951
MIN 149 149 49.3 45.0 67.7 33.2 92.8 75.2 148 161 185 202
(WY) 1990 1942 1942 1942 1942 1942 1942 1957 1957 1957 1957 1957
SUMMARY STATISTICS FOR 1996 CALENDAR YEAR FOR 1997 WATER YEAR WATER YEARS 1933 - 1983, 1988 - 1997
ANNUAL TOTAL 323067.2 266701.2
ANNUAL MEAN 883 731 540
HIGHEST ANNUAL MEAN 858 1973
LOWEST ANNUAL MEAN 174 1942
HIGHEST DAILY MEAN 2490 May 1 1610 Apr 30 2890 Mar 31 1936
LOWEST DAILY MEAN 5.0 Oct 23 ae 5.0 Oct 23 b .00 Sep 29 1962
ANNUAL SEVEN-DAY MINIMUM 7.1 Oct 18 7.1 Oct 18 2.0 Oct 13 1988
10 PERCENT EXCEEDS 1540 1390 1100
50 PERCENT EXCEEDS 882 746 363
90 PERCENT EXCEEDS 224 223 230
a Also occurred October 24.
b Dam closed.
e Estimated.
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