As part of the Great Lakes Restoration Initiative, the U.S. Department of Agriculture, Natural Resources Conservation Service; U.S. Environmental Protection Agency; and the U.S. Geological Survey (USGS) have partnered to evaluate agricultural conservation practices focused on nutrient management. Monitoring methods allow for rapid assessment of water-quality changes in response to conservation efforts by focusing on subsurface-tile drainage and direct surface runoff from fields. Estimated daily loads presented within this dataset are from five surface-runoff monitoring stations (USGS station identification number 441624088045601, approximated drainage area of 4.17 hectare; USGS station identification number 441546088082001, approximated drainage area of 11.0 hectare; USGS station identification number 441520880845001, approximated drainage area of 3.20 hectare; USGS station identification number 442119088085501, approximated drainage area of 1.94 hectare; USGS station identification number 442114088085701, approximated drainage area of 10.4 hectare) and one tile-runoff monitoring station (USGS station identification number 441520088045002; approximated drainage area of 2.02 hectare). The monitored fields are row-crop parcels planted in a biennial corn-soybean crop rotation. Best-management practices were applied during part of the monitoring period. Note: Daily load computations are presented directly as they were output from the GCLAS program and do not represent the degree of accuracy of the estimates.