The annual hydrologic condition is determined by the total annual flow at the gage near Grand Island, NE.
- If the annual flow is above 1,140,265 , the year is classified as “wet."
- If the annual flow is below 679,815 , the year is classified as “dry.”
- If the annual flow falls between 679,815 and 1,140,265 , the year is classified as “normal”.
These thresholds were determined in the 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:
- Characterization of Hydrologic Conditions to Support Platte River Species Recovery Efforts
- PRRIP 2011 Hydrologic Condition Annual and Periodic Designations
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 |