Millstone River at Blackwells Mills, Somerset County NJ (BKWN4)
Gage Location: Somerset County, New JerseySite Location: Somerset County, New Jersey
Latitude: 40.475Longitude: -74.576Elevation: 26.97 ft. MSLDrainage Area: 258 Sq. Mi.
Minor Stage: 9 ft. Moderate Stage: 10 ft.Major Stage: 15 ft.
First Flood: 1924-04-07Last Flood: 2014-03-31 Crest: 9.94 ft.Datum change: 1928-08-17Number of Floods: 146

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Date of FloodCrest(ft)Streamflow(cfs)CategoryCode
1924-04-07117900ModerateC1
1925-02-1210.056340ModerateC1
1926-09-0711.57900ModerateC1
1927-07-2310.87540ModerateC1
1927-10-1810.47000ModerateC1
1932-03-2810.256650Moderatenone
1932-11-109.225200Minornone
1932-11-1910.216650Moderatenone
1933-08-249.775980Minornone
1934-03-059.325300Minornone
1936-01-0310.056330Moderatenone
1936-03-129.275260Minornone
1938-07-2313.2212400Moderatenone
1938-09-2115.2918300Majornone
1939-02-0410.046270Moderatenone
1940-03-159.415440Minornone
1940-04-099.155100Minornone
1942-08-0911.578940Moderatenone
1944-01-0610.056340Moderatenone
1944-03-139.075000Minornone
1944-09-159.926160Minornone
1946-06-0312.3710500Moderatenone
1948-12-3113.8414000Moderatenone
1950-11-269.215180Minornone
1951-12-2111.538870Moderatenone
1952-03-129.575670Minornone
1952-04-2810.216580Moderatenone
1953-01-259.385400Minornone
1953-03-139.565650Minornone
1955-08-1412.428000ModerateC5 F1
1955-08-1912.126500Moderatenone
1955-10-1511.577500ModerateC5 F1
1958-02-2811.057990Moderatenone
1960-09-1311.078030Moderatenone
1961-03-249.074670Minornone
1961-04-149.034630Minornone
1962-01-079.365030Minornone
1962-03-1310.346770Moderatenone
1966-02-1411.218330Moderatenone
1966-10-2094470Minornone
1967-03-0712.249820Moderatenone
1967-12-129.675430Minornone
1968-05-3010.266290Moderatenone
1969-03-2510.356420Moderatenone
1969-07-2910.436540Moderatenone
1970-04-0311.237860Moderatenone
1971-08-2818.6822200Majornone
1971-09-1310.624860Moderatenone
1972-06-2310.44790Moderatenone
1972-11-0912.37440Moderatenone
1973-01-299.924410Minornone
1973-02-0313.098860Moderatenone
1973-08-039.394020Minornone
1973-12-2113.219080Moderatenone
1974-12-179.183890Minornone
1975-03-209.043810Minornone
1975-07-1516.8417100Majornone
1975-07-2114.6312000Moderatenone
1975-09-2513.5410000Moderatenone
1976-01-2810.354810Moderatenone
1977-03-2311.626350Moderatenone
1977-04-059.123850Minornone
1977-11-0810.65020Moderatenone
1977-12-229.874410Minornone
1978-01-2714.0210700Moderatenone
1978-03-1510.214690Moderatenone
1978-03-279.854390Minornone
1979-01-0810.024510Moderatenone
1979-01-2213.8410300Moderatenone
1979-01-2513.379350Moderatenone
1979-02-2612.879000Moderatenone
1979-03-079.934440Minornone
1979-05-2511.616300Moderatenone
1980-03-2211.155600Moderatenone
1982-01-0511.876740Moderatenone
1982-02-049.694130Minornone
1983-03-229.313790Minornone
1983-04-119.764190Minornone
1983-04-1712.467730Moderatenone
1983-12-1412.37460Moderatenone
1984-03-309.013580Minornone
1984-04-0511.456090Moderatenone
1984-05-3012.878460Moderatenone
1984-07-0811.686440Moderatenone
1986-01-269.914330Minornone
1986-04-1712.417650Moderatenone
1986-12-039.343820Minornone
1986-12-259.263750Minornone
1987-04-0511.025460Moderatenone
1987-07-039.013580Minornone
1987-07-159.43870Minornone
1989-06-1010.766190Moderatenone
1989-07-069.134480Minornone
1989-09-2114.4211400Moderatenone
1989-10-219.614950Minornone
1992-06-069.194530Minornone
1992-12-1212.979160Moderatenone
1993-03-2510.195560Moderatenone
1993-12-069.614950Minornone
1994-01-2913.8810500Moderatenone
1994-03-1112.588590Moderatenone
1996-01-2015.0912600Majornone
1996-01-289.895240Minornone
1996-10-2015.5313400Majornone
1996-12-0210.415790Moderatenone
1996-12-089.384720Minornone
1996-12-1410.76120Moderatenone
1997-07-2511.036530Moderatenone
1998-01-249.835180Minornone
1998-04-029.344680Minornone
1998-04-109.534870Minornone
1998-05-119.695030Minornone
1999-03-2210.465850Moderatenone
1999-09-1721.0120300Majornone
2001-03-319.715050Minornone
2003-02-249.755094Minornone
2003-06-0510.985980Moderatenone
2003-11-209.925270Minornone
2003-12-1211.887160Moderatenone
2003-12-259.074420Minornone
2004-02-079.524860Minornone
2004-09-2910.265210Moderatenone
2005-04-0311.416530Moderatenone
2005-10-0911.056060Moderatenone
2005-10-1212.98650Moderatenone
2006-11-0910.765740Moderatenone
2007-03-039.364330Minornone
2007-04-1619.2417100Majornone
2008-02-1410.264980Moderatenone
2008-03-0910.085030Moderatenone
2008-12-1211.887160Moderatenone
2009-08-2310.435160Moderatenone
2009-12-1010.35020Moderatenone
2009-12-2711.46180Moderatenone
2010-03-1416.1512200Majornone
2010-03-3111.897050Moderatenone
2011-03-079.884970Minornone
2011-03-119.194340Minornone
2011-04-1712.598100Moderatenone
2011-08-1510.564760Moderatenone
2011-08-2821.2420700Majornone
2011-09-0813.7710100Moderatenone
2011-11-239.363770Minornone
2011-12-0810.795430Moderatenone
2013-06-0812.627510Moderatenone
2014-03-319.944650Minornone



Codes and description

C1|Crest information looks unreliable and incomplete and not used in frequency calculations. Some of the floods are based on current flood stage and nearby gage information.
C2|Crest information looks reliable despite potential problems. This data was used in frequency calculations.
C3|Crest height estimated by the USGS.
C4|Crest height is from the National Weather Service.
C5|Crest height affected by backwater.
C6|Crest occurred at a previous flood stage that is lower than the current flood stage. The crests below the new flood stage are not used in flood frequency calculations.
C7|Crest from USGS yearly peak and/or date is different than the crest we provide. In many cases MARFC uses crest based on backwater or ice effects.
C8|Crest month or day of occurrence has been estimated by The Middle Atlantic River Forecast Center usually based on nearby gage information.
C9|Crest date (day) in the month is unknown.
F1|Flow is an estimate.
F2|Flow affected by regulation or diversion and in some cases to an unknown degree.
F3|Flow effected by snow-melt, ice jam or debris jam break up.
F4|Flow affected by dam failure.
F5|Flow - All or part of the record affected by urbanization, mining, agricultural changes, channelization or other factors.
G1|Gage height at a different site and/or datum.
G2|Gage is not an official USGS gage with crests provided by the NWS. Crest information looks unreliable and incomplete and not used in flood frequency calculations.
G3|Gage datum changed during this year.
none,No code; Good Data

Updated: 09:58 PM Mar 31, 2014