Long Term Resource Monitoring Program water quality sites: M752.8Y and M752.8Z
Site description: Mississippi River near Lock and Dam #4
Hydrologic Unit Code (HUC): 07040003
Site UTM N: 4908119 (M752.8Y)  4908276 (M752.8Z)
Site UTM E: 585823 (M752.8Y)  586174 (M752.8Z)
UTM zone: 15
Drainage area at water quality site: 57,100 mi2
Sampling frequency: biweekly

Flow station: Lock and Dam #4 (USACOE daily flows)
Station description: Lock and Dam #4 near Alma, WI
Hydrologic Unit Code (HUC): 07040003
Station UTM N: 4908355
Station UTM E: 585973
UTM zone: 15
Drainage area at flow station: 57,100 mi2
Period of record: Calculated flow available from 01/02/1968-07/14/1998
Flow conversion: none

The following constituent values were removed from analysis as
possible outliers, or are below detection limits:
Date      Constituent  Concentration
06/18/97  Chloride     80.077

Additional comments: 
Constituent data is based on sites M752.8Y and M752.8Z from 06/11/1991
to 06/19/1998.  Due to constituent segregation caused by Chippewa River  
inflow, neither station accurately represents Mississippi River loads 
at Lock and Dam #4.  Using Chloride as a conservative measurememt, a 
linear regression model was used to determine the relative proportion 
of constituent values.  From this regression the following formula was
derived for total concentrations of constituents at Lock and Dam #4.

Concentration at Lock and Dam #4 = 0.65(value at M752.8Y) + 0.35(value at M752.8Z)

Loads for this site were estimated with LOADEST2 version 1.10