Summary of water quality characteristics at selected habitat sites - Navigation Pool 13 of the Mississippi River, August 1 through October 31, 1988

Resource Trend Analysis water quality and sediment sampling in
Upper Mississippi River Pool 13, was initiated in August 1988 as a
part of the Long Term Resource Monitoring Program.  Mississippi
Monitoring Station personnel began water quality sampling on Pool
13 the first week of August using equipment and techniques based
on the Procedures Manual for the Long Term Resource Monitoring
Program.  Over 2600 water quality measurements were made under the
Resource Trend Analysis component of the Long Term Resource
Monitoring Program on Pool 13 during the sampling period, August
1, 1988 through October 31, 1988.  Dissolved oxygen increased
throughout the sampling period.  Means at channel habitats were
slightly higher than backwater means.  Specific conductivity
increased similarly in all habitats throughout the sampling
period.  Nephelometric turbidity means displayed a close
association with secchi disk transparency means, each displaying
fluctuation during the sampling period.  Mean turbidities were
higher in backwater habitats than channel habitats and mean secchi
disk values were lower in backwater habitats than channel
habitats.  Velocity means were variable throughout the sampling
period, fluctuating with the mean flow through the lock and dam.