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MERCED RIVER - HAPPY ISLES (HPIC1)

Latitude: 37.73º N	Longitude: 119.56º W	Elevation: 4017 Feet
Location: Mariposa County in California		Bulletin Group: San Joaquin		River Group: San Joaquin

Issuance Time:

Jul 04, 2025 at 8:37 AM PDT

Please Note:

Flow data on this product are unregulated / full natural flow.

Historical Flows

Water Year Seasonal (Apr-Jul)

Rank	Year		Annual Flow	3-Year Mean
	1916	-1704153600000	334.0
	1917	-1672531200000	293.5
	1918	-1640995200000	241.7	289.7
	1919	-1609459200000	222.9	252.7
	1920	-1577923200000	184.9	216.5
	1921	-1546300800000	286.9	231.6
	1922	-1514764800000	319.7	263.8
	1923	-1483228800000	254.8	287.1
	1924	-1451692800000	85.5	220.0
	1925	-1420070400000	287.7	209.3
	1926	-1388534400000	191.0	188.1
	1927	-1356998400000	288.7	255.8
	1928	-1325462400000	209.3	229.7
	1929	-1293840000000	147.7	215.2
	1930	-1262304000000	162.8	173.3
	1931	-1230768000000	86.7	132.4
	1932	-1199232000000	286.4	178.7
	1933	-1167609600000	160.5	177.9
	1934	-1136073600000	112.0	186.3
	1935	-1104537600000	289.4	187.3
	1936	-1073001600000	290.6	230.6
	1937	-1041379200000	275.0	285.0
	1938	-1009843200000	461.7	342.4
	1939	-978307200000	142.6	293.1
	1940	-946771200000	283.3	295.9
	1941	-915148800000	349.8	258.6
	1942	-883612800000	327.7	320.3
	1943	-852076800000	295.2	324.2
	1944	-820540800000	197.5	273.5
	1945	-788918400000	282.2	258.3
	1946	-757382400000	307.3	262.3
	1947	-725846400000	185.8	258.4
	1948	-694310400000	229.9	241.0
	1949	-662688000000	190.9	202.2
	1950	-631152000000	216.0	212.3
	1951	-599616000000	326.2	244.4
	1952	-568080000000	381.4	307.9
	1953	-536457600000	190.2	299.3
	1954	-504921600000	189.3	253.6
	1955	-473385600000	173.8	184.4
	1956	-441849600000	434.0	265.7
	1957	-410227200000	202.5	270.1
	1958	-378691200000	367.1	334.5
	1959	-347155200000	135.3	235.0
	1960	-315619200000	142.8	215.1
	1961	-283996800000	114.2	130.8
	1962	-252460800000	262.3	173.1
	1963	-220924800000	277.8	218.1
	1964	-189388800000	144.5	228.2
	1965	-157766400000	368.6	263.6
	1966	-126230400000	193.6	235.6
	1967	-94694400000	426.9	329.7
	1968	-63158400000	130.9	250.5
	1969	-31536000000	472.1	343.3
	1970	0000	232.1	278.4
	1971	31536000000	229.0	311.1
	1972	63072000000	195.0	218.7
	1973	94694400000	312.1	245.4
	1974	126230400000	328.6	278.6
	1975	157766400000	283.4	308.1
	1976	189302400000	98.3	236.8
	1977	220924800000	61.5	147.7
	1978	252460800000	416.9	192.2
	1979	283996800000	256.3	244.9
	1980	315532800000	383.7	352.3
	1981	347155200000	165.8	268.6
	1982	378691200000	463.4	337.6
	1983	410227200000	580.6	403.2
	1984	441763200000	326.0	456.6
	1985	473385600000	175.0	360.5
	1986	504921600000	390.3	297.1
	1987	536457600000	114.8	226.7
	1988	567993600000	150.7	218.6
	1989	599616000000	183.1	149.5
	1990	631152000000	126.0	153.2
	1991	662688000000	165.7	158.3
	1992	694224000000	145.0	145.6
	1993	725846400000	384.4	231.7
	1994	757382400000	118.0	215.8
	1995	788918400000	541.1	347.8
	1996	820454400000	317.8	325.6
	1997	852076800000	371.6	410.2
	1998	883612800000	429.7	373.0
	1999	915148800000	237.4	346.3
	2000	946684800000	240.5	302.5
	2001	978307200000	165.8	214.6
	2002	1009843200000	216.5	207.6
	2003	1041379200000	262.6	215.0
	2004	1072915200000	185.9	221.6
	2005	1104537600000	426.3	291.6
	2006	1136073600000	461.8	358.0
	2007	1167609600000	122.6	336.9
	2008	1199145600000	194.7	259.7
	2009	1230768000000	266.0	194.4
	2010	1262304000000	283.8	248.2
	2011	1293840000000	489.7	346.5
	2012	1325376000000	141.0	304.8
	2013	1356998400000	151.5	260.7
	2014	1388534400000	108.3	133.6
	2015	1420070400000	74.1	111.3
	2016	1451606400000	268.0	150.1
	2017	1483228800000	634.9	325.6
	2018	1514764800000	205.7	369.5
	2019	1546300800000	397.4	412.7
	2020	1577836800000	134.9	246.0
	2021	1609459200000	99.6	210.6
	2022	1640995200000	165.8	133.4
	2023	1672531200000	579.6	281.7
	2024	1704067200000	262.3	335.9
	2025	1735689600000	199.2	347.0

Rank	Year		Seasonal Flow	3-Year Mean
	1916	-1704153600000	287.4
	1917	-1672531200000	250.4
	1918	-1640995200000	216.7	251.5
	1919	-1609459200000	183.7	216.9
	1920	-1577923200000	165.6	188.7
	1921	-1546300800000	233.2	194.2
	1922	-1514764800000	294.1	231.0
	1923	-1483228800000	215.3	247.5
	1924	-1451692800000	68.2	192.5
	1925	-1420070400000	238.6	174.0
	1926	-1388534400000	166.0	157.6
	1927	-1356998400000	247.5	217.4
	1928	-1325462400000	167.6	193.7
	1929	-1293840000000	133.7	182.9
	1930	-1262304000000	144.4	148.5
	1931	-1230768000000	75.9	118.0
	1932	-1199232000000	254.2	158.2
	1933	-1167609600000	150.1	160.1
	1934	-1136073600000	86.3	163.5
	1935	-1104537600000	252.6	163.0
	1936	-1073001600000	258.1	199.0
	1937	-1041379200000	250.9	253.9
	1938	-1009843200000	391.0	300.0
	1939	-978307200000	108.7	250.2
	1940	-946771200000	239.8	246.5
	1941	-915148800000	307.9	218.8
	1942	-883612800000	273.2	273.6
	1943	-852076800000	247.3	276.1
	1944	-820540800000	176.4	232.3
	1945	-788918400000	239.1	220.9
	1946	-757382400000	241.5	219.0
	1947	-725846400000	143.3	208.0
	1948	-694310400000	210.8	198.5
	1949	-662688000000	180.8	178.3
	1950	-631152000000	194.2	195.2
	1951	-599616000000	195.1	190.0
	1952	-568080000000	339.9	243.0
	1953	-536457600000	162.5	232.5
	1954	-504921600000	168.3	223.6
	1955	-473385600000	155.7	162.2
	1956	-441849600000	328.0	217.4
	1957	-410227200000	174.9	219.5
	1958	-378691200000	322.2	275.0
	1959	-347155200000	107.7	201.6
	1960	-315619200000	124.6	184.8
	1961	-283996800000	96.6	109.7
	1962	-252460800000	237.7	153.0
	1963	-220924800000	228.3	187.5
	1964	-189388800000	117.5	194.5
	1965	-157766400000	252.1	199.3
	1966	-126230400000	155.9	175.2
	1967	-94694400000	348.0	252.0
	1968	-63158400000	106.1	203.3
	1969	-31536000000	413.4	289.2
	1970	0000	181.0	233.5
	1971	31536000000	186.6	260.4
	1972	63072000000	148.8	172.2
	1973	94694400000	268.3	201.3
	1974	126230400000	257.6	224.9
	1975	157766400000	257.6	261.2
	1976	189302400000	67.9	194.3
	1977	220924800000	55.4	127.0
	1978	252460800000	341.6	154.9
	1979	283996800000	220.1	205.7
	1980	315532800000	307.0	289.6
	1981	347155200000	146.8	224.6
	1982	378691200000	358.9	270.9
	1983	410227200000	445.7	317.1
	1984	441763200000	228.3	344.3
	1985	473385600000	138.1	270.7
	1986	504921600000	298.1	221.5
	1987	536457600000	101.6	179.3
	1988	567993600000	107.8	169.2
	1989	599616000000	150.4	119.9
	1990	631152000000	98.3	118.8
	1991	662688000000	155.0	134.5
	1992	694224000000	120.3	124.5
	1993	725846400000	320.9	198.7
	1994	757382400000	103.1	181.4
	1995	788918400000	431.6	285.2
	1996	820454400000	251.7	262.1
	1997	852076800000	232.0	305.1
	1998	883612800000	360.4	281.4
	1999	915148800000	199.2	263.9
	2000	946684800000	212.0	257.2
	2001	978307200000	142.2	184.5
	2002	1009843200000	180.7	178.3
	2003	1041379200000	218.4	180.4
	2004	1072915200000	135.4	178.2
	2005	1104537600000	365.3	239.7
	2006	1136073600000	396.8	299.1
	2007	1167609600000	93.6	285.2
	2008	1199145600000	170.5	220.3
	2009	1230768000000	215.8	160.0
	2010	1262304000000	245.5	210.6
	2011	1293840000000	381.8	281.0
	2012	1325376000000	114.6	247.3
	2013	1356998400000	113.9	203.4
	2014	1388534400000	91.9	106.8
	2015	1420070400000	52.9	86.2
	2016	1451606400000	205.4	116.7
	2017	1483228800000	480.4	246.2
	2018	1514764800000	170.9	285.6
	2019	1546300800000	347.7	333.0
	2020	1577836800000	118.9	212.5
	2021	1609459200000	87.9	184.8
	2022	1640995200000	101.0	102.6
	2023	1672531200000	497.4	228.8
	2024	1704067200000	233.1	277.2
	2025	1735689600000	164.3	298.3

Location Photographs
Upstream Photo	Gage House Photo	Downstream Photo

ESRI™ Locator Map

Official 7 Day National Weather Service Forecast (CAZ324)

Tonight: Clear. Lows 51 to 59. Northwest winds up to 10 mph shifting to the east after midnight.

Saturday: Sunny. Highs 72 to 86. South winds up to 5 mph shifting to the southwest 5 to 15 mph in the afternoon.

Saturday Night: Clear. Lows 54 to 62. West winds up to 10 mph shifting to the northeast after midnight.

Sunday: Warmer, sunny. Highs 76 to 90. East winds up to 5 mph shifting to the southwest in the afternoon.

Sunday Night: Clear. Lows 56 to 64. West winds up to 10 mph shifting to the east after midnight.

Monday through Wednesday Night: Clear. Highs 77 to 91. Lows 56 to 67.

Thursday: Warmer, sunny. Highs 83 to 97.

Thursday Night: Mostly clear. Lows 61 to 69.

Friday: Sunny. Highs 84 to 98.

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