Long Term Resource Monitoring Program water quality site: M241.4K
Site description: Mississippi River at Lock and Dam #25
Hydrologic Unit Code (HUC): 07110004
Site UTM N: 4319647
Site UTM E: 700637
UTM zone: 15
Drainage area at water quality site: 142,048 mi2
Sampling frequency: biweekly
   
Flow station: 05587450 (USGS daily flows)
Station description: Mississippi River at Grafton, IL
Hydrologic Unit Code (HUC): 07110009 
Station UTM N: 4316170
Station UTM E: 722807
UTM zone: 15
Drainage area at flow station: 171,300 mi2
Period of record: 04/01/1933-09/30/1997
Flow conversion:
Flow at M241.4K = Flow of Mississippi R. at Grafton, IL - (Illinois R. flow + Cuivre R. flow)

   Mississippi River at Grafton, IL = (flow at USGS station 05587450)

   Cuivre River near confluence with Mississippi River
                              = (1.3577 * daily flow at USGS station 05514500)
                                Station 05514500 is Cuivre River at Troy, MO
   
   Illinois River near confluence with Mississippi River
                              = (1.0758 * daily flow at USGS station 05586100)
                                Station 05586100 is Illinois River at Valley City, IL

The following constituent values were removed from analysis as
possible outliers, or are below detection limits:
Date	     Constituent    		  Concentration
06/29/93     Soluble Reactive Phosphorus     4.74
06/29/93     Dissolved Ammonia		    13.39
12/13/96     Dissolved Silicon		    20.28
07/14/92     Chloride   		   116.00
11/14/95     Chloride       		     1.57

Additional comments: 
Due to multiple sites being used to calculate the flow at lock and dam 25, 
the estimates of discharge may not be correct.

Loads for this site were estimated with LOADEST2 version 1.101