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: 2014-05-01 Crest: 15.87 ft.Datum change: 1928-08-17Number of Floods: 147

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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
2014-05-0115.8711800Majornone



Codes and description

C1|Crest information during this period may be incomplete and therefore was not used in frequency calculations. Some of the floods are based on current flood stage and nearby gage information.
C2|Crest information during this period 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: 07:31 AM Dec 19, 2014