The purpose of the Stream Flow Reports is to give a summary of stream flow conditions throughout the state. Flow statistics for a gage in each watershed are calculated from historic flow records. Each watershed is then classified as experiencing high, normal, low or protected flow levels. A fifth category, flooding, is used when flows exceed an established flood level.
There are two types of Stream Flow Maps and Reports used. The Weekly Stream Flow Report is generated on Mondays from April through September. The data for the weekly report are based on an instantaneous flow reading. Therefore, this value can be affected by large storm events, hydropower or dam operations, or other factors that may influence stream flows.
The monthly hydrologic conditions report is found here.
To ensure timely production of weekly stream flow maps, preliminary data are used. Only the annual stream flow maps are updated with final data.