The above analysis is based on 12 years of data between 1981-1993 (OLD STREAMFLOW GAGE DATA). There may be multiple peaks each year on the Middle Fork Salmon River. The average recession Gage Height analysis is based only on when the stream is receding. Increases in streamflow were ignored. If rain event or additional snowmelt generated a streamflow increase, the rising part of hydrograph was ignored, and only recession flow was used to determine average receding gage height.
Analysis is a guide to assist with recession flow determination, results vary and depend upon future streamflow peaks and past, current and future climatic conditions (additional rain and / or extreme hot or cool air temperatures).
To use: If today's average gage height is 4.0 feet (Day 19) and launch date is 20 days out, gage height may be about 2.5 feet (Day 39) on launch date. If streamflow increase occurs between now and launch date, start over when stream starts receding.