Long Term Resource Monitoring Program water quality site: M525.5L Site description: Mississippi River above Lock and Dam #13 Hydrologic Unit Code (HUC): 07060005 Site UTM N: 4646700 Site UTM E: 735860 UTM zone: 15 Drainage area at water quality site: 85,306 mi2 Sampling frequency: biweekly Flow station: Lock and Dam #13 (USACOE daily flows) Station description: Lock and Dam #13 at Clinton, IA Hydrologic Unit Code (HUC): 07060005 Station UTM N: 4642185 Station UTM E: 735869 UTM zone: 15 Drainage area at flow station: 85,306 mi2 Period of record: 01/01/1986-08/04/1998 Flow conversion: Occasional missing flow values (fewer than 10 total) were substituted with values from the USGS gaging station at Clinton, IA (05420500). A linear regression equation was calculated to substitute flows for these two sites. The equation used follows: flow at Lock and Dam #13 = 1.0122 * Flow at Clinton Iowa (05420500) R2 = 0.9924 The following constituent values were removed from analysis as possible outliers, or are below detection limits: Date Constituent Concentration 08/09/1996 Chloride 1.0242 Additional comments: none Loads for this site were estimated with LOADEST2 version 1.10