Upstream-to-Downstream Report

These graphs plot annual mean stream concentrations from upstream to downstream within each basin, for the selected parameter, year and historical comparison period. See more details below on how to interpret these graphs.

Dissolved Oxygen (DO)

Appropriate levels of Dissolved Oxygen are essential for aquatic life and low levels put stress on fish and other organisms. High temperatures reduce the capacity of water to absorb oxygen, causing DO to decrease as temperature increases. High levels of organic matter and pollutants can lower DO in Streams by creating an oxygen demand, pulling oxygen out of the water.

Open Report: Dissolved Oxygen
Upstream-to-Downstream Dissolved Oxygen (mg/L)

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Additional Instructions for interpreting the graphs

There are four different kinds of series plotted on the Upstream to Downstream line charts:

  • Solid line series represent data for the selected year.
  • Dashed lines represent data for the historical period averages.
  • Tributary stations are shown as triangle points, not connected to their respective basin series but located along the X-axis geographically according to where that tributary meets the mainstem creek.
  • Effluent stations are shown as diamond points, not connected to their respective basin series but located along the X-axis geographically according to where the discharge enters the mainstem creek.

Tributary and effluent points for the selected year are shown in solid color, and points for the historical period are shown in a lighter, slightly larger version behind them.

There are three historical comparison period options including:

  • The 5-year period preceding this study year
  • The 10-year period preceding this study year
  • All data available for that location and parameter, excluding this study year

Please note that choosing a different Year does not change the years included in the three comparison period options.