How do I read the Yakima River graphs?  

  Due to the number of lines represented on some of the graphs in the Seattle District H&H Branch Homepage, the following tips should assist you in correctly reading the graphs.
  1. The Zero Damage and Major Damage lines in red are related to the stage of the river. The river stage is the elevation, in feet, of the river at the remote gage location.

  2. The flow, in cubic feet per second (cfs), represents the amount or volume of water passing the remote gage at the time of collection.

  3. Stage and flow are related based on rating tables created and maintained by the US Geological Survey. Every stage reading can be directly linked with a flow or volume of water currently in the river.

  4. Most graphs have a specific color representing various types of data.

  • Reservoir or Lake Elevation: Blue

  • Reservoir Outflow or River Stage: Red

  • Reservoir Inflow: Green

  • River Flow: Cyan(Light Blue)

  • Air Temperature: Black

  • Incremental Precipitation: Yellow

If there are multiple gages on a single graph, such as basin summaries, then the color scheme listed above may not be followed.

  Provisional Data Disclaimer

Data from realtime streamflow gages are relayed to the District's office through numerous data transmission methods. Data are transmitted from each station at intervals of either 3 or 4 hours and are loaded onto the District's computer system.

Realtime streamflow data available on this web site are PROVISIONAL data that have not been reviewed or edited. These data may be subject to significant change and are not citeable until reviewed and approved. Realtime streamflow data may be changed after review because the stage-discharge relationship may have been affected by:

  • backwater from ice or debris such as log jams
  • algal and aquatic growth in the stream
  • sediment movement
  • malfunction of recording equipment

Data are reviewed periodically to ensure accuracy. Each station record is considered PROVISIONAL until the data are published. The data are usually published within 6 months of the end of the water year.

Users are cautioned to consider carefully the provisional nature of the information before using it for decisions that concern personal or public safety or the conduct of business that involves substantial monetary or operational consequences.


Home | Contact Us | River Reports | Fly Fishing Adventures