• bible sitting next to a teapot      Whitman Mission
National Historic Site Washington  Monitoring Doan Creek  The
Park Service has been recording stream data since water began to
flow through the new Doan Creek channel. On a weekly basis, at
five different sites along the creek, the Mission collects the
following measurements: Dissolved Oxygen (DO): This is a
measurement of how much gaseous oxygen is in the water. Oxygen
is put into the water by vegetation as a product of
photosynthesis, and it is important for aquatic animals, like
fish, whose cells need oxygen just like humans. Temperature:
Water temperature is a significant factor, especially for fish
species sensitive to temperature fluctuations. Salmon species
prefer a temperature range of 54˚F-57˚F, and anything higher
than 77˚F can be deadly. Temperature and DO are related, because
the warmer the water, the less dissolved oxygen the water can
hold. Turbidity: This is a measurement of clarity, or how much
sediment or other particulate matter the