U.S. Fish and Wildlife Service Annual Hydrologic Condition Designation

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The annual hydrologic condition is determined by the total annual flow at the USGS gage near Grand Island, NE.

If the annual flow is above 1,140,265 AF, the year is classified as “wet."
If the annual flow is below 679,815 AF, the year is classified as “dry.”
If the annual flow falls between 679,815 AF and 1,140,265 AF, the year is classified as “normal”.

These thresholds were determined in the PRRIP program document using annual flows at Grand Island from 1947-1994 with the highest 1/3 of years classified as “wet”, the lowest 1/4 of years classified as “dry”, and the remaining years classified as “normal”.

For more information, see these documents:

Year	Condition
1942	Wet
1943	Normal
1944	Normal
1945	Normal
1946	Normal
1947	Normal
1948	Normal
1949	Wet
1950	Normal
1951	Wet
1952	Wet
1953	Dry
1954	Dry
1955	Dry
1956	Dry
1957	Dry
1958	Normal
1959	Dry
1960	Normal
1961	Dry
1962	Normal
1963	Dry
1964	Dry
1965	Wet
1966	Normal
1967	Normal
1968	Normal
1969	Normal
1970	Wet
1971	Wet
1972	Wet
1973	Wet
1974	Wet
1975	Normal
1976	Dry
1977	Normal
1978	Normal
1979	Normal
1980	Wet
1981	Dry
1982	Normal
1983	Wet
1984	Wet
1985	Wet
1986	Wet
1987	Wet
1988	Normal
1989	Normal
1990	Normal
1991	Dry
1992	Normal
1993	Wet
1994	Normal
1995	Wet
1996	Wet
1997	Wet
1998	Wet
1999	Wet
2000	Wet
2001	Normal
2002	Dry
2003	Dry
2004	Dry
2005	Dry
2006	Dry
2007	Normal
2008	Normal
2009	Normal
2010	Wet
2011	Wet
2012	Normal
2013	Normal
2014	Normal
2015	Wet
2016	Wet
2017	Wet
2018	Normal
2019	Wet
2020	Wet
2021	Normal
2022	Dry
2023	Normal

Platte River Recovery Implementation Program

Target Species

Hydrologic Conditions

USFWS Target Flows

Flow Reports

U.S. Fish and Wildlife Service Annual Hydrologic Condition Designation