Estimated Annual Loads File Formation Information Field Name Description SITECODE Arbitrary site code based on the pool of the Upper Mississippi River that the tributary enters AGENCY CODE Station identification code used by monitoring agency that collected concentration data YEAR Year of load estimate DISCHARGE (MILLIONS of M3/ Year) Cumulative discharge of water for the site for the year TN_N1 (Metric Tons/Year) Annual (calendar year) load estimate of total nitrogen from the maximum likelihood of best-fit model TN_N2 (Metric Tons/Year) Annual (calendar year) load estimate of total nitrogen from the linear attribution estimate of best-fit model TN_N3 (Metric Tons/Year) Annual (calendar year) load estimate of total nitrogen from the least absolute deviation of best-fit model NOx_N1 (Metric Tons/Year) Annual (calendar year) load estimate of nitrate + nitrite from the maximum likelihood of best-fit model NOx_N2 (Metric Tons/Year) Annual (calendar year) load estimate of nitrate + nitrite from the linear attribution estimate of best-fit model NOx_N3 (Metric Tons/Year) Annual (calendar year) load estimate of nitrate + nitrite from the least absolute deviation of best-fit model NHx_N1 (Metric Tons/Year) Annual (calendar year) load estimate of total ammonia from the maximum likelihood of best-fit model NHx_N2 (Metric Tons/Year) Annual (calendar year) load estimate of total ammonia from the linear attribution estimate of best-fit model NHx_N3 (Metric Tons/Year) Annual (calendar year) load estimate of total ammonia from the least absolute deviation of best-fit model TP_P1 (Metric Tons/Year) Annual (calendar year) load estimate of total phosphorus from the maximum likelihood of best-fit model TP_P2 (Metric Tons/Year) Annual (calendar year) load estimate of total phosphorus from the linear attribution estimate of best-fit model TP_P3 (Metric Tons/Year) Annual (calendar year) load estimate of total phosphorus from the least absolute deviation of best-fit model SRP_P1 (Metric Tons/Year) Annual (calendar year) load estimate of soluble reactive phosphorus from the maximum likelihood of best-fit model SRP_P2 (Metric Tons/Year) Annual (calendar year) load estimate of soluble reactive phosphorus from the linear attribution estimate of best-fit model SRP_P3 (Metric Tons/Year) Annual (calendar year) load estimate of soluble reactive phosphorus from the least absolute deviation of best-fit model TSS1 (Metric Tons/Year) Annual (calendar year) load estimate of total suspended solids from the maximum likelihood of best-fit model TSS2 (Metric Tons/Year) Annual (calendar year) load estimate of total suspended solids from the linear attribution estimate of best-fit model TSS3 (Metric Tons/Year) Annual (calendar year) load estimate of total suspended solids from the least absolute deviation of best-fit model CL1 (Metric Tons/Year) Annual (calendar year) load estimate of chloride from the maximum likelihood of best-fit model CL2 (Metric Tons/Year) Annual (calendar year) load estimate of chloride from the linear attribution estimate of best-fit model CL3 (Metric Tons/Year) Annual (calendar year) load estimate of chloride from the least absolute deviation of best-fit model SiO2_Si1 (Metric Tons/Year) Annual (calendar year) load estimate of silicate silica from the maximum likelihood of best-fit model SiO2_Si2 (Metric Tons/Year) Annual (calendar year) load estimate of silicate silica from the linear attribution estimate of best-fit model SiO2_Si3 (Metric Tons/Year) Annual (calendar year) load estimate of silicate silica from the least absolute deviation of best-fit model