[ { "water_year": 1961, "beginning_date": "1960-10-01", "south_arm_elevation_ft_ngvd29": 4193.35, "north_arm_elevation_ft_ngvd29": 4192.35, "north_arm_method": "imputed_south_arm_minus_1ft", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 1962, "beginning_date": "1961-10-01", "south_arm_elevation_ft_ngvd29": 4191.7, "north_arm_elevation_ft_ngvd29": 4190.7, "north_arm_method": "imputed_south_arm_minus_1ft", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 1963, "beginning_date": "1962-10-01", "south_arm_elevation_ft_ngvd29": 4192.15, "north_arm_elevation_ft_ngvd29": 4191.15, "north_arm_method": "imputed_south_arm_minus_1ft", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 1964, "beginning_date": "1963-10-01", "south_arm_elevation_ft_ngvd29": 4191.5, "north_arm_elevation_ft_ngvd29": 4190.5, "north_arm_method": "imputed_south_arm_minus_1ft", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 1965, "beginning_date": "1964-10-01", "south_arm_elevation_ft_ngvd29": 4192.6, "north_arm_elevation_ft_ngvd29": 4191.6, "north_arm_method": "imputed_south_arm_minus_1ft", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 1966, "beginning_date": "1965-10-01", "south_arm_elevation_ft_ngvd29": 4193.75, "north_arm_elevation_ft_ngvd29": 4192.75, "north_arm_method": "imputed_south_arm_minus_1ft", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 1967, "beginning_date": "1966-10-01", "south_arm_elevation_ft_ngvd29": 4193.4, "north_arm_elevation_ft_ngvd29": 4193.1, "north_arm_method": "observed", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 1968, "beginning_date": "1967-10-01", "south_arm_elevation_ft_ngvd29": 4193.85, "north_arm_elevation_ft_ngvd29": 4193.4, "north_arm_method": "observed", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 1969, "beginning_date": "1968-10-01", "south_arm_elevation_ft_ngvd29": 4194.3, "north_arm_elevation_ft_ngvd29": 4193.8, "north_arm_method": "observed", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 1970, "beginning_date": "1969-10-01", "south_arm_elevation_ft_ngvd29": 4195.25, "north_arm_elevation_ft_ngvd29": 4194.5, "north_arm_method": "observed", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 1971, "beginning_date": "1970-10-01", "south_arm_elevation_ft_ngvd29": 4194.9, "north_arm_elevation_ft_ngvd29": 4194.2, "north_arm_method": "observed", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 1972, "beginning_date": "1971-10-01", "south_arm_elevation_ft_ngvd29": 4196.85, "north_arm_elevation_ft_ngvd29": 4195.9, "north_arm_method": "observed", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 1973, "beginning_date": "1972-10-01", "south_arm_elevation_ft_ngvd29": 4197.9, "north_arm_elevation_ft_ngvd29": 4196.8, "north_arm_method": "observed", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 1974, "beginning_date": "1973-10-01", "south_arm_elevation_ft_ngvd29": 4199.2, "north_arm_elevation_ft_ngvd29": 4197.8, "north_arm_method": "observed", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 1975, "beginning_date": "1974-10-01", "south_arm_elevation_ft_ngvd29": 4199.25, "north_arm_elevation_ft_ngvd29": 4197.9, "north_arm_method": "observed", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 1976, "beginning_date": "1975-10-01", "south_arm_elevation_ft_ngvd29": 4200.0, "north_arm_elevation_ft_ngvd29": 4198.8, "north_arm_method": "observed", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 1977, "beginning_date": "1976-10-01", "south_arm_elevation_ft_ngvd29": 4200.4, "north_arm_elevation_ft_ngvd29": 4199.3, "north_arm_method": "observed", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 1978, "beginning_date": "1977-10-01", "south_arm_elevation_ft_ngvd29": 4198.9, "north_arm_elevation_ft_ngvd29": 4198.1, "north_arm_method": "observed", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 1979, "beginning_date": "1978-10-01", "south_arm_elevation_ft_ngvd29": 4198.55, "north_arm_elevation_ft_ngvd29": 4197.5, "north_arm_method": "observed", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 1980, "beginning_date": "1979-10-01", "south_arm_elevation_ft_ngvd29": 4197.65, "north_arm_elevation_ft_ngvd29": 4196.8, "north_arm_method": "observed", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 1981, "beginning_date": "1980-10-01", "south_arm_elevation_ft_ngvd29": 4199.1, "north_arm_elevation_ft_ngvd29": 4197.8, "north_arm_method": "observed", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 1982, "beginning_date": "1981-10-01", "south_arm_elevation_ft_ngvd29": 4198.15, "north_arm_elevation_ft_ngvd29": 4197.2, "north_arm_method": "observed", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 1983, "beginning_date": "1982-10-01", "south_arm_elevation_ft_ngvd29": 4200.05, "north_arm_elevation_ft_ngvd29": 4198.6, "north_arm_method": "observed", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 1984, "beginning_date": "1983-10-01", "south_arm_elevation_ft_ngvd29": 4204.35, "north_arm_elevation_ft_ngvd29": 4202.1, "north_arm_method": "observed", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 1985, "beginning_date": "1984-10-01", "south_arm_elevation_ft_ngvd29": 4207.7, "north_arm_elevation_ft_ngvd29": 4207.1, "north_arm_method": "observed", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 1986, "beginning_date": "1985-10-01", "south_arm_elevation_ft_ngvd29": 4208.2, "north_arm_elevation_ft_ngvd29": 4207.8, "north_arm_method": "observed", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 1987, "beginning_date": "1986-10-01", "south_arm_elevation_ft_ngvd29": 4210.4, "north_arm_elevation_ft_ngvd29": 4210.0, "north_arm_method": "observed", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 1988, "beginning_date": "1987-10-01", "south_arm_elevation_ft_ngvd29": 4209.1, "north_arm_elevation_ft_ngvd29": 4209.0, "north_arm_method": "observed", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 1989, "beginning_date": "1988-10-01", "south_arm_elevation_ft_ngvd29": 4206.2, "north_arm_elevation_ft_ngvd29": 4206.2, "north_arm_method": "observed", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 1990, "beginning_date": "1989-10-01", "south_arm_elevation_ft_ngvd29": 4204.0, "north_arm_elevation_ft_ngvd29": 4204.1, "north_arm_method": "observed", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 1991, "beginning_date": "1990-10-01", "south_arm_elevation_ft_ngvd29": 4201.8, "north_arm_elevation_ft_ngvd29": 4201.8, "north_arm_method": "observed", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 1992, "beginning_date": "1991-10-01", "south_arm_elevation_ft_ngvd29": 4200.5, "north_arm_elevation_ft_ngvd29": 4200.1, "north_arm_method": "observed", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 1993, "beginning_date": "1992-10-01", "south_arm_elevation_ft_ngvd29": 4198.8, "north_arm_elevation_ft_ngvd29": 4197.8, "north_arm_method": "observed", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 1994, "beginning_date": "1993-10-01", "south_arm_elevation_ft_ngvd29": 4199.6, "north_arm_elevation_ft_ngvd29": 4196.7, "north_arm_method": "observed", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 1995, "beginning_date": "1994-10-01", "south_arm_elevation_ft_ngvd29": 4197.6, "north_arm_elevation_ft_ngvd29": 4196.9, "north_arm_method": "observed", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 1996, "beginning_date": "1995-10-01", "south_arm_elevation_ft_ngvd29": 4198.6, "north_arm_elevation_ft_ngvd29": 4197.4, "north_arm_method": "observed", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 1997, "beginning_date": "1996-10-01", "south_arm_elevation_ft_ngvd29": 4198.5, "north_arm_elevation_ft_ngvd29": 4197.2, "north_arm_method": "observed", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 1998, "beginning_date": "1997-10-01", "south_arm_elevation_ft_ngvd29": 4200.2, "north_arm_elevation_ft_ngvd29": 4199.0, "north_arm_method": "observed", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 1999, "beginning_date": "1998-10-01", "south_arm_elevation_ft_ngvd29": 4201.9, "north_arm_elevation_ft_ngvd29": 4201.7, "north_arm_method": "observed", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 2000, "beginning_date": "1999-10-01", "south_arm_elevation_ft_ngvd29": 4202.5, "north_arm_elevation_ft_ngvd29": 4202.2, "north_arm_method": "observed", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 2001, "beginning_date": "2000-10-01", "south_arm_elevation_ft_ngvd29": 4201.1, "north_arm_elevation_ft_ngvd29": 4200.7, "north_arm_method": "observed", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 2002, "beginning_date": "2001-10-01", "south_arm_elevation_ft_ngvd29": 4199.11, "north_arm_elevation_ft_ngvd29": 4198.68, "north_arm_method": "observed", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 2003, "beginning_date": "2002-10-01", "south_arm_elevation_ft_ngvd29": 4197.5, "north_arm_elevation_ft_ngvd29": 4197.14, "north_arm_method": "observed", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 2004, "beginning_date": "2003-10-01", "south_arm_elevation_ft_ngvd29": 4195.43, "north_arm_elevation_ft_ngvd29": 4195.04, "north_arm_method": "observed", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 2005, "beginning_date": "2004-10-01", "south_arm_elevation_ft_ngvd29": 4194.12, "north_arm_elevation_ft_ngvd29": 4193.67, "north_arm_method": "observed", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 2006, "beginning_date": "2005-10-01", "south_arm_elevation_ft_ngvd29": 4195.57, "north_arm_elevation_ft_ngvd29": 4195.02, "north_arm_method": "observed", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 2007, "beginning_date": "2006-10-01", "south_arm_elevation_ft_ngvd29": 4196.36, "north_arm_elevation_ft_ngvd29": 4195.71, "north_arm_method": "observed", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 2008, "beginning_date": "2007-10-01", "south_arm_elevation_ft_ngvd29": 4195.26, "north_arm_elevation_ft_ngvd29": 4194.7, "north_arm_method": "observed", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 2009, "beginning_date": "2008-10-01", "south_arm_elevation_ft_ngvd29": 4194.08, "north_arm_elevation_ft_ngvd29": 4193.44, "north_arm_method": "observed", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 2010, "beginning_date": "2009-10-01", "south_arm_elevation_ft_ngvd29": 4194.48, "north_arm_elevation_ft_ngvd29": 4193.9, "north_arm_method": "observed", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 2011, "beginning_date": "2010-10-01", "south_arm_elevation_ft_ngvd29": 4193.81, "north_arm_elevation_ft_ngvd29": 4193.1, "north_arm_method": "observed", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 2012, "beginning_date": "2011-10-01", "south_arm_elevation_ft_ngvd29": 4197.43, "north_arm_elevation_ft_ngvd29": 4196.66, "north_arm_method": "observed", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 2013, "beginning_date": "2012-10-01", "south_arm_elevation_ft_ngvd29": 4196.26, "north_arm_elevation_ft_ngvd29": 4195.62, "north_arm_method": "observed", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 2014, "beginning_date": "2013-10-01", "south_arm_elevation_ft_ngvd29": 4194.39, "north_arm_elevation_ft_ngvd29": 4194.19, "north_arm_method": "observed", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 2015, "beginning_date": "2014-10-01", "south_arm_elevation_ft_ngvd29": 4193.48, "north_arm_elevation_ft_ngvd29": 4192.99, "north_arm_method": "observed", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 2016, "beginning_date": "2015-10-01", "south_arm_elevation_ft_ngvd29": 4192.62, "north_arm_elevation_ft_ngvd29": 4190.96, "north_arm_method": "observed", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 2017, "beginning_date": "2016-10-01", "south_arm_elevation_ft_ngvd29": 4192.42, "north_arm_elevation_ft_ngvd29": 4189.15, "north_arm_method": "observed", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 2018, "beginning_date": "2017-10-01", "south_arm_elevation_ft_ngvd29": 4193.6, "north_arm_elevation_ft_ngvd29": 4193.0, "north_arm_method": "observed", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 2019, "beginning_date": "2018-10-01", "south_arm_elevation_ft_ngvd29": 4192.1, "north_arm_elevation_ft_ngvd29": 4191.9, "north_arm_method": "observed", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 2020, "beginning_date": "2019-10-01", "south_arm_elevation_ft_ngvd29": 4193.3, "north_arm_elevation_ft_ngvd29": 4193.1, "north_arm_method": "observed", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 2021, "beginning_date": "2020-10-01", "south_arm_elevation_ft_ngvd29": 4192.5, "north_arm_elevation_ft_ngvd29": 4192.1, "north_arm_method": "observed", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 2022, "beginning_date": "2021-10-01", "south_arm_elevation_ft_ngvd29": 4190.4, "north_arm_elevation_ft_ngvd29": 4190.1, "north_arm_method": "observed", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 2023, "beginning_date": "2022-10-01", "south_arm_elevation_ft_ngvd29": 4189.0, "north_arm_elevation_ft_ngvd29": 4188.9, "north_arm_method": "observed", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 2024, "beginning_date": "2023-10-01", "south_arm_elevation_ft_ngvd29": 4192.0, "north_arm_elevation_ft_ngvd29": 4189.0, "north_arm_method": "observed", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 2025, "beginning_date": "2024-10-01", "south_arm_elevation_ft_ngvd29": 4192.4, "north_arm_elevation_ft_ngvd29": 4191.7, "north_arm_method": "observed", "date_note": "observed 10/01 beginning-of-water-year elevation" }, { "water_year": 2026, "beginning_date": "2025-09-30", "south_arm_elevation_ft_ngvd29": 4191.1, "north_arm_elevation_ft_ngvd29": 4190.9, "north_arm_method": "observed", "date_note": "proxy for 2025-10-01 because 2025-10-01 was not available; uses 2025-09-30" } ]