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Annual suspended sediment loads and water discharges were calculated in the Mississippi River main-stem channel and major tributary inputs at gaging stations from St. Louis, MO, to Belle Chasse, LA, for the period of water years 1990 to 2013. The purpose was to (1) quantify changes in the Mississippi River sediment budget by linking with an earlier study for the periods of pre-1953 and 1970–1978 (Keown et al. 1981) and (2) examine the role of anthropogenic (e.g., dams, river control works, soil conservation practices) and natural (e.g., rainfall and denudation rates) factors in controlling these changes. The present report focuses on (1) a first-order comparison of changes in station-specific sediment loads with the earlier Keown results, (2) documenting data quality and data comparison issues observed in the data, and (3) identifying possible additional gaging station sites at critical junctures that would improve future sediment budget assessments for the Mississippi River. It is anticipated that sediment budgets will provide a powerful framework when combined with other geomorphic assessment tools (e.g., specific gage records, channel geometry changes) to aid in unraveling the complex morphological processes that drive the Mississippi River. This integration is also planned for future, comprehensive MRG&P efforts. DISCLAIMER: The contents of this report are not to be used for advertising, publication, or promotional purposes. Citation of trade names does not constitute an official endorsement or approval of the use of such commercial products. All product names and trademarks cited are the property of their respective owners. The findings of this report are not to be construed as an official Department of the Army position unless so designated by other authorized documents. DESTROY THIS REPORT WHEN NO LONGER NEEDED. DO NOT RETURN IT TO THE ORIGINATOR. MRG&P Report No. 12 iii

Suspended sediment loads and tributary inputs into the Mississippi River below St. Louis, MO, 1990–2013 : A comparison with the Keown et al. (1981) report