To the Senate of the United States:
On the last day of the last session of Congress a resolution, which had passed both Houses, "in relation to removal of obstructions to navigation in the mouth of the Mississippi River" was presented to me for approval. I have retained this resolution because it was presented to me at a period when it was impossible to give the subject that examination to which it appeared to be entitled. I need not repeat the views on this point presented in the introductory portion of my message to the Senate of the 2d (1st) instant.
In addition I would merely observe that although at different periods sums, amounting in the aggregate to $690,000, have been appropriated by Congress for the purpose of removing the bar and obstructions at the mouth of the Mississippi, yet it is now acknowledged that this money has been expended with but little, if any, practical benefit to its navigation.
James Buchanan, Veto Message Online by Gerhard Peters and John T. Woolley, The American Presidency Project https://www.presidency.ucsb.edu/node/203242