I read somewhere earlier that federal funds were already approved.
FEMA has a number of disaster relief programs, none of them dealing with repairing dams or bridges, etc. What they do is refund local government for the cost of policemen, firemen and public shelters who were involved with the evacuation and with those who were displaced due to floods. So yes federal money has been authorized but not for fixing the dam. There is billions of dollars of state bond money available to fix the dam, no federal funding necessary.